Merge remote-tracking branch 'remotes/origin/master' into fix_store_selectors

.travis.yml

@@ -1,5 +1,5 @@
 sudo: required
-dist: trusty
+dist: bionic
 
 env:
   # Install the latest docker-compose version for ci testing.
@@ -12,6 +12,9 @@ env:
   DSPACE_REST_NAMESPACE: '/server/api'
   DSPACE_REST_SSL: false
 
+services:
+  - xvfb
+
 before_install:
   # Docker Compose Install
   - curl -L https://github.com/docker/compose/releases/download/${COMPOSE_VERSION}/docker-compose-`uname -s`-`uname -m` > docker-compose
@@ -33,14 +36,6 @@ before_script:
 after_script:
   - docker-compose -f ./docker/docker-compose-travis.yml down
 
-addons:
-  apt:
-    sources:
-      - google-chrome
-    packages:
-      - dpkg
-      - google-chrome-stable
-
 language: node_js
 
 node_js:
@@ -53,8 +48,6 @@ cache:
 bundler_args: --retry 5
 
 script:
-  # Use Chromium instead of Chrome.
-  - export CHROME_BIN=chromium-browser
   - yarn run build
   - yarn run ci
   - cat coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js

resources/i18n/en.json5

@@ -1566,6 +1566,8 @@
 
   "search.results.no-results-link": "quotes around it",
 
+  "search.results.empty": "Your search returned no results.",
+
 
 
   "search.sidebar.close": "Back to results",
@@ -1639,13 +1641,21 @@
 
   "submission.sections.describe.relationship-lookup.selected": "Selected {{ size }} items",
 
-  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Author": "Search for Authors",
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Author": "Local Authors ({{ count }})",
 
-  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Journal": "Search for Journals",
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Journal": "Local Journals ({{ count }})",
 
-  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Journal Issue": "Search for Journal Issues",
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Journal Issue": "Local Journal Issues ({{ count }})",
 
-  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Journal Volume": "Search for Journal Volumes",
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Journal Volume": "Local Journal Volumes ({{ count }})",
+
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.sherpaJournal": "Sherpa Journals ({{ count }})",
+
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.sherpaPublisher": "Sherpa Publishers ({{ count }})",
+
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.orcidV2": "ORCID ({{ count }})",
+
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.lcname": "LC Names ({{ count }})",
 
   "submission.sections.describe.relationship-lookup.search-tab.tab-title.Funding Agency": "Search for Funding Agencies",
 
@@ -1679,6 +1689,14 @@
 
   "submission.sections.describe.relationship-lookup.selection-tab.title.Journal Issue": "Selected Issue",
 
+  "submission.sections.describe.relationship-lookup.selection-tab.title.sherpaJournal": "Search Results",
+
+  "submission.sections.describe.relationship-lookup.selection-tab.title.sherpaPublisher": "Search Results",
+
+  "submission.sections.describe.relationship-lookup.selection-tab.title.orcidV2": "Search Results",
+
+  "submission.sections.describe.relationship-lookup.selection-tab.title.lcname": "Search Results",
+
   "submission.sections.describe.relationship-lookup.name-variant.notification.content": "Would you like to save \"{{ value }}\" as a name variant for this person so you and others can reuse it for future submissions? If you don\'t you can still use it for this submission.",
 
   "submission.sections.describe.relationship-lookup.name-variant.notification.confirm": "Save a new name variant",

src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.html

@@ -1,14 +1,13 @@
 <ng-container *ngVar="(subCollectionsRDObs | async) as subCollectionsRD">
   <div *ngIf="subCollectionsRD?.hasSucceeded && subCollectionsRD?.payload.totalElements > 0" @fadeIn>
     <h2>{{'community.sub-collection-list.head' | translate}}</h2>
-    <ul>
+    <ds-viewable-collection
-      <li *ngFor="let collection of subCollectionsRD?.payload.page">
+      [config]="config"
-        <p>
+      [sortConfig]="sortConfig"
-          <span class="lead"><a [routerLink]="['/collections', collection.id]">{{collection.name}}</a></span><br>
+      [objects]="subCollectionsRD"
-          <span class="text-muted">{{collection.shortDescription}}</span>
+      [hideGear]="false"
-        </p>
+      (paginationChange)="onPaginationChange($event)">
-      </li>
+    </ds-viewable-collection>
-    </ul>
   </div>
   <ds-error *ngIf="subCollectionsRD?.hasFailed" message="{{'error.sub-collections' | translate}}"></ds-error>
   <ds-loading *ngIf="subCollectionsRD?.isLoading" message="{{'loading.sub-collections' | translate}}"></ds-loading>

src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.spec.ts

@@ -0,0 +1,182 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { TranslateModule } from '@ngx-translate/core';
+import { NO_ERRORS_SCHEMA } from '@angular/core';
+import { By } from '@angular/platform-browser';
+import { RouterTestingModule } from '@angular/router/testing';
+import { NoopAnimationsModule } from '@angular/platform-browser/animations';
+
+import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
+
+import { CommunityPageSubCollectionListComponent } from './community-page-sub-collection-list.component';
+import { Community } from '../../core/shared/community.model';
+import { SharedModule } from '../../shared/shared.module';
+import { CollectionDataService } from '../../core/data/collection-data.service';
+import { FindListOptions } from '../../core/data/request.models';
+import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { PaginatedList } from '../../core/data/paginated-list';
+import { PageInfo } from '../../core/shared/page-info.model';
+import { HostWindowService } from '../../shared/host-window.service';
+import { HostWindowServiceStub } from '../../shared/testing/host-window-service-stub';
+import { SelectableListService } from '../../shared/object-list/selectable-list/selectable-list.service';
+
+describe('CommunityPageSubCollectionList Component', () => {
+  let comp: CommunityPageSubCollectionListComponent;
+  let fixture: ComponentFixture<CommunityPageSubCollectionListComponent>;
+  let collectionDataServiceStub: any;
+  let subCollList = [];
+
+  const collections = [Object.assign(new Community(), {
+    id: '123456789-1',
+    metadata: {
+      'dc.title': [
+        { language: 'en_US', value: 'Collection 1' }
+      ]
+    }
+  }),
+    Object.assign(new Community(), {
+      id: '123456789-2',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 2' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-3',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 3' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-4',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 4' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-5',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 5' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-6',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 6' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-7',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 7' }
+        ]
+      }
+    })
+  ];
+
+  const mockCommunity = Object.assign(new Community(), {
+    id: '123456789',
+    metadata: {
+      'dc.title': [
+        { language: 'en_US', value: 'Test title' }
+      ]
+    }
+  });
+
+  collectionDataServiceStub = {
+    findByParent(parentUUID: string, options: FindListOptions = {}) {
+      let currentPage = options.currentPage;
+      let elementsPerPage = options.elementsPerPage;
+      if (currentPage === undefined) {
+        currentPage = 1
+      }
+      elementsPerPage = 5;
+      const startPageIndex = (currentPage - 1) * elementsPerPage;
+      let endPageIndex = (currentPage * elementsPerPage);
+      if (endPageIndex > subCollList.length) {
+        endPageIndex = subCollList.length;
+      }
+      return createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), subCollList.slice(startPageIndex, endPageIndex)));
+
+    }
+  };
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      imports: [
+        TranslateModule.forRoot(),
+        SharedModule,
+        RouterTestingModule.withRoutes([]),
+        NgbModule.forRoot(),
+        NoopAnimationsModule
+      ],
+      declarations: [CommunityPageSubCollectionListComponent],
+      providers: [
+        { provide: CollectionDataService, useValue: collectionDataServiceStub },
+        { provide: HostWindowService, useValue: new HostWindowServiceStub(0) },
+        { provide: SelectableListService, useValue: {} },
+      ],
+      schemas: [NO_ERRORS_SCHEMA]
+    }).compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(CommunityPageSubCollectionListComponent);
+    comp = fixture.componentInstance;
+    comp.community = mockCommunity;
+  });
+
+  it('should display a list of collections', () => {
+    subCollList = collections;
+    fixture.detectChanges();
+
+    const collList = fixture.debugElement.queryAll(By.css('li'));
+    expect(collList.length).toEqual(5);
+    expect(collList[0].nativeElement.textContent).toContain('Collection 1');
+    expect(collList[1].nativeElement.textContent).toContain('Collection 2');
+    expect(collList[2].nativeElement.textContent).toContain('Collection 3');
+    expect(collList[3].nativeElement.textContent).toContain('Collection 4');
+    expect(collList[4].nativeElement.textContent).toContain('Collection 5');
+  });
+
+  it('should not display the header when list of collections is empty', () => {
+    subCollList = [];
+    fixture.detectChanges();
+
+    const subComHead = fixture.debugElement.queryAll(By.css('h2'));
+    expect(subComHead.length).toEqual(0);
+  });
+
+  it('should update list of collections on pagination change', () => {
+    subCollList = collections;
+    fixture.detectChanges();
+
+    const pagination = Object.create({
+      pagination:{
+        id: comp.pageId,
+        currentPage: 2,
+        pageSize: 5
+      },
+      sort: {
+        field: 'dc.title',
+        direction: 'ASC'
+      }
+    });
+    comp.onPaginationChange(pagination);
+    fixture.detectChanges();
+
+    const collList = fixture.debugElement.queryAll(By.css('li'));
+    expect(collList.length).toEqual(2);
+    expect(collList[0].nativeElement.textContent).toContain('Collection 6');
+    expect(collList[1].nativeElement.textContent).toContain('Collection 7');
+  });
+});

src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.ts

@@ -1,12 +1,16 @@
 import { Component, Input, OnInit } from '@angular/core';
-import { Observable } from 'rxjs';
+
+import { BehaviorSubject } from 'rxjs';
+import { take } from 'rxjs/operators';
 
 import { RemoteData } from '../../core/data/remote-data';
 import { Collection } from '../../core/shared/collection.model';
 import { Community } from '../../core/shared/community.model';
-
 import { fadeIn } from '../../shared/animations/fade';
 import { PaginatedList } from '../../core/data/paginated-list';
+import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
+import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
+import { CollectionDataService } from '../../core/data/collection-data.service';
 
 @Component({
   selector: 'ds-community-page-sub-collection-list',
@@ -16,9 +20,60 @@ import { PaginatedList } from '../../core/data/paginated-list';
 })
 export class CommunityPageSubCollectionListComponent implements OnInit {
   @Input() community: Community;
-  subCollectionsRDObs: Observable<RemoteData<PaginatedList<Collection>>>;
+
+  /**
+   * The pagination configuration
+   */
+  config: PaginationComponentOptions;
+
+  /**
+   * The pagination id
+   */
+  pageId = 'community-collections-pagination';
+
+  /**
+   * The sorting configuration
+   */
+  sortConfig: SortOptions;
+
+  /**
+   * A list of remote data objects of communities' collections
+   */
+  subCollectionsRDObs: BehaviorSubject<RemoteData<PaginatedList<Collection>>> = new BehaviorSubject<RemoteData<PaginatedList<Collection>>>({} as any);
+
+  constructor(private cds: CollectionDataService) {}
 
   ngOnInit(): void {
-    this.subCollectionsRDObs = this.community.collections;
+    this.config = new PaginationComponentOptions();
+    this.config.id = this.pageId;
+    this.config.pageSize = 5;
+    this.config.currentPage = 1;
+    this.sortConfig = new SortOptions('dc.title', SortDirection.ASC);
+    this.updatePage();
+  }
+
+  /**
+   * Called when one of the pagination settings is changed
+   * @param event The new pagination data
+   */
+  onPaginationChange(event) {
+    this.config.currentPage = event.pagination.currentPage;
+    this.config.pageSize = event.pagination.pageSize;
+    this.sortConfig.field = event.sort.field;
+    this.sortConfig.direction = event.sort.direction;
+    this.updatePage();
+  }
+
+  /**
+   * Update the list of collections
+   */
+  updatePage() {
+    this.cds.findByParent(this.community.id,{
+      currentPage: this.config.currentPage,
+      elementsPerPage: this.config.pageSize,
+      sort: { field: this.sortConfig.field, direction: this.sortConfig.direction }
+    }).pipe(take(1)).subscribe((results) => {
+      this.subCollectionsRDObs.next(results);
+    });
   }
 }

src/app/+community-page/sub-community-list/community-page-sub-community-list.component.html

@@ -1,14 +1,13 @@
 <ng-container *ngVar="(subCommunitiesRDObs | async) as subCommunitiesRD">
   <div *ngIf="subCommunitiesRD?.hasSucceeded && subCommunitiesRD?.payload.totalElements > 0" @fadeIn>
     <h2>{{'community.sub-community-list.head' | translate}}</h2>
-    <ul>
+    <ds-viewable-collection
-      <li *ngFor="let community of subCommunitiesRD?.payload.page">
+      [config]="config"
-        <p>
+      [sortConfig]="sortConfig"
-          <span class="lead"><a [routerLink]="['/communities', community.id]">{{community.name}}</a></span><br>
+      [objects]="subCommunitiesRD"
-          <span class="text-muted">{{community.shortDescription}}</span>
+      [hideGear]="false"
-        </p>
+      (paginationChange)="onPaginationChange($event)">
-      </li>
+    </ds-viewable-collection>
-    </ul>
   </div>
   <ds-error *ngIf="subCommunitiesRD?.hasFailed" message="{{'error.sub-communities' | translate}}"></ds-error>
   <ds-loading *ngIf="subCommunitiesRD?.isLoading" message="{{'loading.sub-communities' | translate}}"></ds-loading>

src/app/+community-page/sub-community-list/community-page-sub-community-list.component.spec.ts

@@ -1,21 +1,29 @@
 import { async, ComponentFixture, TestBed } from '@angular/core/testing';
 import { TranslateModule } from '@ngx-translate/core';
 import { NO_ERRORS_SCHEMA } from '@angular/core';
-import {CommunityPageSubCommunityListComponent} from './community-page-sub-community-list.component';
-import {Community} from '../../core/shared/community.model';
-import {RemoteData} from '../../core/data/remote-data';
-import {PaginatedList} from '../../core/data/paginated-list';
-import {PageInfo} from '../../core/shared/page-info.model';
-import {SharedModule} from '../../shared/shared.module';
 import { RouterTestingModule } from '@angular/router/testing';
 import { NoopAnimationsModule } from '@angular/platform-browser/animations';
 import { By } from '@angular/platform-browser';
-import {of as observableOf,  Observable } from 'rxjs';
-import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
 
-describe('SubCommunityList Component', () => {
+import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
+
+import { CommunityPageSubCommunityListComponent } from './community-page-sub-community-list.component';
+import { Community } from '../../core/shared/community.model';
+import { PaginatedList } from '../../core/data/paginated-list';
+import { PageInfo } from '../../core/shared/page-info.model';
+import { SharedModule } from '../../shared/shared.module';
+import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { FindListOptions } from '../../core/data/request.models';
+import { HostWindowService } from '../../shared/host-window.service';
+import { HostWindowServiceStub } from '../../shared/testing/host-window-service-stub';
+import { CommunityDataService } from '../../core/data/community-data.service';
+import { SelectableListService } from '../../shared/object-list/selectable-list/selectable-list.service';
+
+describe('CommunityPageSubCommunityListComponent Component', () => {
   let comp: CommunityPageSubCommunityListComponent;
   let fixture: ComponentFixture<CommunityPageSubCommunityListComponent>;
+  let communityDataServiceStub: any;
+  let subCommList = [];
 
   const subcommunities = [Object.assign(new Community(), {
     id: '123456789-1',
@@ -32,34 +40,92 @@ describe('SubCommunityList Component', () => {
           { language: 'en_US', value: 'SubCommunity 2' }
         ]
       }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-3',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 3' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '12345678942',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 4' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-5',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 5' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-6',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 6' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-7',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 7' }
+        ]
+      }
     })
   ];
 
-  const emptySubCommunitiesCommunity = Object.assign(new Community(), {
+  const mockCommunity = Object.assign(new Community(), {
+    id: '123456789',
     metadata: {
       'dc.title': [
         { language: 'en_US', value: 'Test title' }
       ]
-    },
+    }
-    subcommunities: createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), []))
   });
 
-  const mockCommunity = Object.assign(new Community(), {
+  communityDataServiceStub = {
-      metadata: {
+    findByParent(parentUUID: string, options: FindListOptions = {}) {
-        'dc.title': [
+      let currentPage = options.currentPage;
-          { language: 'en_US', value: 'Test title' }
+      let elementsPerPage = options.elementsPerPage;
-        ]
+      if (currentPage === undefined) {
-      },
+        currentPage = 1
-      subcommunities: createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), subcommunities))
+      }
-    })
+      elementsPerPage = 5;
-  ;
+
+      const startPageIndex = (currentPage - 1) * elementsPerPage;
+      let endPageIndex = (currentPage * elementsPerPage);
+      if (endPageIndex > subCommList.length) {
+        endPageIndex = subCommList.length;
+      }
+      return createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), subCommList.slice(startPageIndex, endPageIndex)));
+
+    }
+  };
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
-      imports: [TranslateModule.forRoot(), SharedModule,
+      imports: [
+        TranslateModule.forRoot(),
+        SharedModule,
         RouterTestingModule.withRoutes([]),
-        NoopAnimationsModule],
+        NgbModule.forRoot(),
+        NoopAnimationsModule
+      ],
       declarations: [CommunityPageSubCommunityListComponent],
+      providers: [
+        { provide: CommunityDataService, useValue: communityDataServiceStub },
+        { provide: HostWindowService, useValue: new HostWindowServiceStub(0) },
+        { provide: SelectableListService, useValue: {} },
+      ],
       schemas: [NO_ERRORS_SCHEMA]
     }).compileComponents();
   }));
@@ -67,23 +133,52 @@ describe('SubCommunityList Component', () => {
   beforeEach(() => {
     fixture = TestBed.createComponent(CommunityPageSubCommunityListComponent);
     comp = fixture.componentInstance;
+    comp.community = mockCommunity;
+
   });
 
-  it('should display a list of subCommunities', () => {
+  it('should display a list of sub-communities', () => {
-    comp.community = mockCommunity;
+    subCommList = subcommunities;
     fixture.detectChanges();
 
     const subComList = fixture.debugElement.queryAll(By.css('li'));
-    expect(subComList.length).toEqual(2);
+    expect(subComList.length).toEqual(5);
     expect(subComList[0].nativeElement.textContent).toContain('SubCommunity 1');
     expect(subComList[1].nativeElement.textContent).toContain('SubCommunity 2');
+    expect(subComList[2].nativeElement.textContent).toContain('SubCommunity 3');
+    expect(subComList[3].nativeElement.textContent).toContain('SubCommunity 4');
+    expect(subComList[4].nativeElement.textContent).toContain('SubCommunity 5');
   });
 
-  it('should not display the header when subCommunities are empty', () => {
+  it('should not display the header when list of sub-communities is empty', () => {
-    comp.community = emptySubCommunitiesCommunity;
+    subCommList = [];
     fixture.detectChanges();
 
     const subComHead = fixture.debugElement.queryAll(By.css('h2'));
     expect(subComHead.length).toEqual(0);
   });
+
+  it('should update list of sub-communities on pagination change', () => {
+    subCommList = subcommunities;
+    fixture.detectChanges();
+
+    const pagination = Object.create({
+      pagination:{
+        id: comp.pageId,
+        currentPage: 2,
+        pageSize: 5
+      },
+      sort: {
+        field: 'dc.title',
+        direction: 'ASC'
+      }
+    });
+    comp.onPaginationChange(pagination);
+    fixture.detectChanges();
+
+    const collList = fixture.debugElement.queryAll(By.css('li'));
+    expect(collList.length).toEqual(2);
+    expect(collList[0].nativeElement.textContent).toContain('SubCommunity 6');
+    expect(collList[1].nativeElement.textContent).toContain('SubCommunity 7');
+  });
 });

src/app/+community-page/sub-community-list/community-page-sub-community-list.component.ts

@@ -1,11 +1,15 @@
 import { Component, Input, OnInit } from '@angular/core';
 
+import { BehaviorSubject } from 'rxjs';
+import { take } from 'rxjs/operators';
+
 import { RemoteData } from '../../core/data/remote-data';
 import { Community } from '../../core/shared/community.model';
-
 import { fadeIn } from '../../shared/animations/fade';
 import { PaginatedList } from '../../core/data/paginated-list';
-import {Observable} from 'rxjs';
+import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
+import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
+import { CommunityDataService } from '../../core/data/community-data.service';
 
 @Component({
   selector: 'ds-community-page-sub-community-list',
@@ -18,9 +22,61 @@ import {Observable} from 'rxjs';
  */
 export class CommunityPageSubCommunityListComponent implements OnInit {
   @Input() community: Community;
-  subCommunitiesRDObs: Observable<RemoteData<PaginatedList<Community>>>;
+
+  /**
+   * The pagination configuration
+   */
+  config: PaginationComponentOptions;
+
+  /**
+   * The pagination id
+   */
+  pageId = 'community-subCommunities-pagination';
+
+  /**
+   * The sorting configuration
+   */
+  sortConfig: SortOptions;
+
+  /**
+   * A list of remote data objects of communities' collections
+   */
+  subCommunitiesRDObs: BehaviorSubject<RemoteData<PaginatedList<Community>>> = new BehaviorSubject<RemoteData<PaginatedList<Community>>>({} as any);
+
+  constructor(private cds: CommunityDataService) {
+  }
 
   ngOnInit(): void {
-    this.subCommunitiesRDObs = this.community.subcommunities;
+    this.config = new PaginationComponentOptions();
+    this.config.id = this.pageId;
+    this.config.pageSize = 5;
+    this.config.currentPage = 1;
+    this.sortConfig = new SortOptions('dc.title', SortDirection.ASC);
+    this.updatePage();
+  }
+
+  /**
+   * Called when one of the pagination settings is changed
+   * @param event The new pagination data
+   */
+  onPaginationChange(event) {
+    this.config.currentPage = event.pagination.currentPage;
+    this.config.pageSize = event.pagination.pageSize;
+    this.sortConfig.field = event.sort.field;
+    this.sortConfig.direction = event.sort.direction;
+    this.updatePage();
+  }
+
+  /**
+   * Update the list of sub-communities
+   */
+  updatePage() {
+    this.cds.findByParent(this.community.id, {
+      currentPage: this.config.currentPage,
+      elementsPerPage: this.config.pageSize,
+      sort: { field: this.sortConfig.field, direction: this.sortConfig.direction }
+    }).pipe(take(1)).subscribe((results) => {
+      this.subCommunitiesRDObs.next(results);
+    });
   }
 }

src/app/+home-page/top-level-community-list/top-level-community-list.component.spec.ts

@@ -0,0 +1,161 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { TranslateModule } from '@ngx-translate/core';
+import { NO_ERRORS_SCHEMA } from '@angular/core';
+import { RouterTestingModule } from '@angular/router/testing';
+import { NoopAnimationsModule } from '@angular/platform-browser/animations';
+import { By } from '@angular/platform-browser';
+
+import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
+
+import { TopLevelCommunityListComponent } from './top-level-community-list.component';
+import { Community } from '../../core/shared/community.model';
+import { PaginatedList } from '../../core/data/paginated-list';
+import { PageInfo } from '../../core/shared/page-info.model';
+import { SharedModule } from '../../shared/shared.module';
+import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { FindListOptions } from '../../core/data/request.models';
+import { HostWindowService } from '../../shared/host-window.service';
+import { HostWindowServiceStub } from '../../shared/testing/host-window-service-stub';
+import { CommunityDataService } from '../../core/data/community-data.service';
+import { SelectableListService } from '../../shared/object-list/selectable-list/selectable-list.service';
+
+describe('TopLevelCommunityList Component', () => {
+  let comp: TopLevelCommunityListComponent;
+  let fixture: ComponentFixture<TopLevelCommunityListComponent>;
+  let communityDataServiceStub: any;
+
+  const topCommList = [Object.assign(new Community(), {
+    id: '123456789-1',
+    metadata: {
+      'dc.title': [
+        { language: 'en_US', value: 'TopCommunity 1' }
+      ]
+    }
+  }),
+    Object.assign(new Community(), {
+      id: '123456789-2',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'TopCommunity 2' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-3',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'TopCommunity 3' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '12345678942',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'TopCommunity 4' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-5',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'TopCommunity 5' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-6',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'TopCommunity 6' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-7',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'TopCommunity 7' }
+        ]
+      }
+    })
+  ];
+
+  communityDataServiceStub = {
+    findTop(options: FindListOptions = {}) {
+      let currentPage = options.currentPage;
+      let elementsPerPage = options.elementsPerPage;
+      if (currentPage === undefined) {
+        currentPage = 1
+      }
+      elementsPerPage = 5;
+
+      const startPageIndex = (currentPage - 1) * elementsPerPage;
+      let endPageIndex = (currentPage * elementsPerPage);
+      if (endPageIndex > topCommList.length) {
+        endPageIndex = topCommList.length;
+      }
+      return createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), topCommList.slice(startPageIndex, endPageIndex)));
+
+    }
+  };
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      imports: [
+        TranslateModule.forRoot(),
+        SharedModule,
+        RouterTestingModule.withRoutes([]),
+        NgbModule.forRoot(),
+        NoopAnimationsModule
+      ],
+      declarations: [TopLevelCommunityListComponent],
+      providers: [
+        { provide: CommunityDataService, useValue: communityDataServiceStub },
+        { provide: HostWindowService, useValue: new HostWindowServiceStub(0) },
+        { provide: SelectableListService, useValue: {} },
+      ],
+      schemas: [NO_ERRORS_SCHEMA]
+    }).compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(TopLevelCommunityListComponent);
+    comp = fixture.componentInstance;
+    fixture.detectChanges();
+
+  });
+
+  it('should display a list of top-communities', () => {
+    const subComList = fixture.debugElement.queryAll(By.css('li'));
+
+    expect(subComList.length).toEqual(5);
+    expect(subComList[0].nativeElement.textContent).toContain('TopCommunity 1');
+    expect(subComList[1].nativeElement.textContent).toContain('TopCommunity 2');
+    expect(subComList[2].nativeElement.textContent).toContain('TopCommunity 3');
+    expect(subComList[3].nativeElement.textContent).toContain('TopCommunity 4');
+    expect(subComList[4].nativeElement.textContent).toContain('TopCommunity 5');
+  });
+
+  it('should update list of top-communities on pagination change', () => {
+    const pagination = Object.create({
+      pagination:{
+        id: comp.pageId,
+        currentPage: 2,
+        pageSize: 5
+      },
+      sort: {
+        field: 'dc.title',
+        direction: 'ASC'
+      }
+    });
+    comp.onPaginationChange(pagination);
+    fixture.detectChanges();
+
+    const collList = fixture.debugElement.queryAll(By.css('li'));
+    expect(collList.length).toEqual(2);
+    expect(collList[0].nativeElement.textContent).toContain('TopCommunity 6');
+    expect(collList[1].nativeElement.textContent).toContain('TopCommunity 7');
+  });
+});

src/app/+home-page/top-level-community-list/top-level-community-list.component.ts

@@ -1,15 +1,15 @@
 import { ChangeDetectionStrategy, Component, OnInit } from '@angular/core';
-import { BehaviorSubject, Observable } from 'rxjs';
+
+import { BehaviorSubject } from 'rxjs';
+import { take } from 'rxjs/operators';
+
 import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
 import { CommunityDataService } from '../../core/data/community-data.service';
 import { PaginatedList } from '../../core/data/paginated-list';
-
 import { RemoteData } from '../../core/data/remote-data';
 import { Community } from '../../core/shared/community.model';
-
 import { fadeInOut } from '../../shared/animations/fade';
 import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
-import { take } from 'rxjs/operators';
 
 /**
  * this component renders the Top-Level Community list
@@ -33,6 +33,11 @@ export class TopLevelCommunityListComponent implements OnInit {
    */
   config: PaginationComponentOptions;
 
+  /**
+   * The pagination id
+   */
+  pageId = 'top-level-pagination';
+
   /**
    * The sorting configuration
    */
@@ -40,7 +45,7 @@ export class TopLevelCommunityListComponent implements OnInit {
 
   constructor(private cds: CommunityDataService) {
     this.config = new PaginationComponentOptions();
-    this.config.id = 'top-level-pagination';
+    this.config.id = this.pageId;
     this.config.pageSize = 5;
     this.config.currentPage = 1;
     this.sortConfig = new SortOptions('dc.title', SortDirection.ASC);
@@ -55,10 +60,10 @@ export class TopLevelCommunityListComponent implements OnInit {
    * @param event The new pagination data
    */
   onPaginationChange(event) {
-    this.config.currentPage = event.page;
+    this.config.currentPage = event.pagination.currentPage;
-    this.config.pageSize = event.pageSize;
+    this.config.pageSize = event.pagination.pageSize;
-    this.sortConfig.field = event.sortField;
+    this.sortConfig.field = event.sort.field;
-    this.sortConfig.direction = event.sortDirection;
+    this.sortConfig.direction = event.sort.direction;
     this.updatePage();
   }
 

src/app/+item-page/edit-item-page/item-relationships/edit-relationship/edit-relationship.component.ts

@@ -70,5 +70,4 @@ export class EditRelationshipComponent implements OnChanges {
   canUndo(): boolean {
     return this.fieldUpdate.changeType >= 0;
   }
-
 }

src/app/+search-page/configuration-search-page.component.ts

@@ -5,10 +5,10 @@ import { ChangeDetectionStrategy, Component, Inject, Input, OnInit } from '@angu
 import { pushInOut } from '../shared/animations/push';
 import { SEARCH_CONFIG_SERVICE } from '../+my-dspace-page/my-dspace-page.component';
 import { SearchConfigurationService } from '../core/shared/search/search-configuration.service';
-import { Router } from '@angular/router';
 import { hasValue } from '../shared/empty.util';
 import { RouteService } from '../core/services/route.service';
 import { SearchService } from '../core/shared/search/search.service';
+import { Router } from '@angular/router';
 
 /**
  * This component renders a search page using a configuration as input.
@@ -61,5 +61,8 @@ export class ConfigurationSearchPageComponent extends SearchComponent implements
     if (hasValue(this.configuration)) {
       this.routeService.setParameter('configuration', this.configuration);
     }
+    if (hasValue(this.fixedFilterQuery)) {
+      this.routeService.setParameter('fixedFilter', this.fixedFilterQuery);
+    }
   }
 }

src/app/+search-page/search-page.module.ts

@@ -3,12 +3,17 @@ import { CommonModule } from '@angular/common';
 import { CoreModule } from '../core/core.module';
 import { SharedModule } from '../shared/shared.module';
 import { SearchPageRoutingModule } from './search-page-routing.module';
-import { SearchPageComponent } from './search-page.component';
+import { SearchComponent } from './search.component';
+import { SidebarService } from '../shared/sidebar/sidebar.service';
+import { EffectsModule } from '@ngrx/effects';
 import { ConfigurationSearchPageComponent } from './configuration-search-page.component';
 import { ConfigurationSearchPageGuard } from './configuration-search-page.guard';
 import { SearchTrackerComponent } from './search-tracker.component';
 import { StatisticsModule } from '../statistics/statistics.module';
-import { SearchComponent } from './search.component';
+import { SearchPageComponent } from './search-page.component';
+import { SidebarFilterService } from '../shared/sidebar/filter/sidebar-filter.service';
+import { SearchFilterService } from '../core/shared/search/search-filter.service';
+import { SearchConfigurationService } from '../core/shared/search/search-configuration.service';
 
 const components = [
   SearchPageComponent,
@@ -25,8 +30,14 @@ const components = [
     CoreModule.forRoot(),
     StatisticsModule.forRoot(),
   ],
-  providers: [ConfigurationSearchPageGuard],
   declarations: components,
+  providers: [
+    SidebarService,
+    SidebarFilterService,
+    SearchFilterService,
+    ConfigurationSearchPageGuard,
+    SearchConfigurationService
+  ],
   exports: components
 })
 

src/app/+search-page/search-tracker.component.ts

@@ -9,10 +9,10 @@ import { RouteService } from '../core/services/route.service';
 import { hasValue } from '../shared/empty.util';
 import { SearchSuccessResponse } from '../core/cache/response.models';
 import { SearchConfigurationService } from '../core/shared/search/search-configuration.service';
-import { Router } from '@angular/router';
 import { SearchService } from '../core/shared/search/search.service';
 import { PaginatedSearchOptions } from '../shared/search/paginated-search-options.model';
 import { SearchQueryResponse } from '../shared/search/search-query-response.model';
+import { Router } from '@angular/router';
 
 /**
  * This component triggers a page view statistic

src/app/+search-page/search.component.ts

@@ -11,9 +11,9 @@ import { hasValue, isNotEmpty } from '../shared/empty.util';
 import { getSucceededRemoteData } from '../core/shared/operators';
 import { RouteService } from '../core/services/route.service';
 import { SEARCH_CONFIG_SERVICE } from '../+my-dspace-page/my-dspace-page.component';
-import { SearchConfigurationService } from '../core/shared/search/search-configuration.service';
-import { SearchResult } from '../shared/search/search-result.model';
 import { PaginatedSearchOptions } from '../shared/search/paginated-search-options.model';
+import { SearchResult } from '../shared/search/search-result.model';
+import { SearchConfigurationService } from '../core/shared/search/search-configuration.service';
 import { SearchService } from '../core/shared/search/search.service';
 import { currentPath } from '../shared/utils/route.utils';
 import { Router } from '@angular/router';

src/app/core/cache/models/normalized-external-source-entry.model.ts

@@ -0,0 +1,36 @@
+import { autoserialize, autoserializeAs, inheritSerialization } from 'cerialize';
+import { NormalizedObject } from './normalized-object.model';
+import { ExternalSourceEntry } from '../../shared/external-source-entry.model';
+import { mapsTo } from '../builders/build-decorators';
+import { MetadataMap, MetadataMapSerializer } from '../../shared/metadata.models';
+
+/**
+ * Normalized model class for an external source entry
+ */
+@mapsTo(ExternalSourceEntry)
+@inheritSerialization(NormalizedObject)
+export class NormalizedExternalSourceEntry extends NormalizedObject<ExternalSourceEntry> {
+  /**
+   * Unique identifier
+   */
+  @autoserialize
+  id: string;
+
+  /**
+   * The value to display
+   */
+  @autoserialize
+  display: string;
+
+  /**
+   * The value to store the entry with
+   */
+  @autoserialize
+  value: string;
+
+  /**
+   * Metadata of the entry
+   */
+  @autoserializeAs(MetadataMapSerializer)
+  metadata: MetadataMap;
+}

src/app/core/cache/models/normalized-external-source.model.ts

@@ -0,0 +1,29 @@
+import { autoserialize, inheritSerialization } from 'cerialize';
+import { NormalizedObject } from './normalized-object.model';
+import { ExternalSource } from '../../shared/external-source.model';
+import { mapsTo } from '../builders/build-decorators';
+
+/**
+ * Normalized model class for an external source
+ */
+@mapsTo(ExternalSource)
+@inheritSerialization(NormalizedObject)
+export class NormalizedExternalSource extends NormalizedObject<ExternalSource> {
+  /**
+   * Unique identifier
+   */
+  @autoserialize
+  id: string;
+
+  /**
+   * The name of this external source
+   */
+  @autoserialize
+  name: string;
+
+  /**
+   * Is the source hierarchical?
+   */
+  @autoserialize
+  hierarchical: boolean;
+}

src/app/core/core.module.ts

@@ -136,6 +136,10 @@ import { SearchConfigurationService } from './shared/search/search-configuration
 import { SelectableListService } from '../shared/object-list/selectable-list/selectable-list.service';
 import { RelationshipTypeService } from './data/relationship-type.service';
 import { SidebarService } from '../shared/sidebar/sidebar.service';
+import { NormalizedExternalSource } from './cache/models/normalized-external-source.model';
+import { NormalizedExternalSourceEntry } from './cache/models/normalized-external-source-entry.model';
+import { ExternalSourceService } from './data/external-source.service';
+import { LookupRelationService } from './data/lookup-relation.service';
 
 /**
  * When not in production, endpoint responses can be mocked for testing purposes
@@ -247,6 +251,8 @@ const PROVIDERS = [
   SearchConfigurationService,
   SelectableListService,
   RelationshipTypeService,
+  ExternalSourceService,
+  LookupRelationService,
   // register AuthInterceptor as HttpInterceptor
   {
     provide: HTTP_INTERCEPTORS,
@@ -292,7 +298,9 @@ export const normalizedModels =
     NormalizedPoolTask,
     NormalizedRelationship,
     NormalizedRelationshipType,
-    NormalizedItemType
+    NormalizedItemType,
+    NormalizedExternalSource,
+    NormalizedExternalSourceEntry
   ];
 
 @NgModule({

src/app/core/data/data.service.spec.ts

@@ -17,6 +17,7 @@ import { NormalizedObjectBuildService } from '../cache/builders/normalized-objec
 import { NotificationsService } from '../../shared/notifications/notifications.service';
 import { Item } from '../shared/item.model';
 import * as uuidv4 from 'uuid/v4';
+import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
 
 const endpoint = 'https://rest.api/core';
 
@@ -191,8 +192,7 @@ describe('DataService', () => {
       dso2.self = selfLink;
       dso2.metadata = [{ key: 'dc.title', value: name2 }];
 
-      spyOn(service, 'findByHref').and.returnValues(observableOf(dso));
+      spyOn(service, 'findByHref').and.returnValue(createSuccessfulRemoteDataObject$(dso));
-      spyOn(objectCache, 'getObjectBySelfLink').and.returnValues(observableOf(dso));
       spyOn(objectCache, 'addPatch');
     });
 

src/app/core/data/data.service.ts

@@ -37,7 +37,7 @@ import { Operation } from 'fast-json-patch';
 import { ObjectCacheService } from '../cache/object-cache.service';
 import { DSpaceObject } from '../shared/dspace-object.model';
 import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { configureRequest, getResponseFromEntry } from '../shared/operators';
+import { configureRequest, getRemoteDataPayload, getResponseFromEntry, getSucceededRemoteData } from '../shared/operators';
 import { ErrorResponse, RestResponse } from '../cache/response.models';
 import { NotificationOptions } from '../../shared/notifications/models/notification-options.model';
 import { DSpaceRESTv2Serializer } from '../dspace-rest-v2/dspace-rest-v2.serializer';
@@ -248,8 +248,11 @@ export abstract class DataService<T extends CacheableObject> {
    * @param {DSpaceObject} object The given object
    */
   update(object: T): Observable<RemoteData<T>> {
-    const oldVersion$ = this.objectCache.getObjectBySelfLink(object.self);
+    const oldVersion$ = this.findByHref(object.self);
-    return oldVersion$.pipe(take(1), mergeMap((oldVersion: NormalizedObject<T>) => {
+    return oldVersion$.pipe(
+      getSucceededRemoteData(),
+      getRemoteDataPayload(),
+      mergeMap((oldVersion: T) => {
         const operations = this.comparator.diff(oldVersion, object);
         if (isNotEmpty(operations)) {
           this.objectCache.addPatch(object.self, operations);
@@ -257,7 +260,6 @@ export abstract class DataService<T extends CacheableObject> {
         return this.findByHref(object.self);
       }
     ));
-
   }
 
   /**

src/app/core/data/external-source.service.spec.ts

@@ -0,0 +1,76 @@
+import { ExternalSourceService } from './external-source.service';
+import { createPaginatedList, createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { ExternalSourceEntry } from '../shared/external-source-entry.model';
+import { of as observableOf } from 'rxjs';
+import { GetRequest } from './request.models';
+
+describe('ExternalSourceService', () => {
+  let service: ExternalSourceService;
+
+  let requestService;
+  let rdbService;
+  let halService;
+
+  const entries = [
+    Object.assign(new ExternalSourceEntry(), {
+      id: '0001-0001-0001-0001',
+      display: 'John Doe',
+      value: 'John, Doe',
+      metadata: {
+        'dc.identifier.uri': [
+          {
+            value: 'https://orcid.org/0001-0001-0001-0001'
+          }
+        ]
+      }
+    }),
+    Object.assign(new ExternalSourceEntry(), {
+      id: '0001-0001-0001-0002',
+      display: 'Sampson Megan',
+      value: 'Sampson, Megan',
+      metadata: {
+        'dc.identifier.uri': [
+          {
+            value: 'https://orcid.org/0001-0001-0001-0002'
+          }
+        ]
+      }
+    })
+  ];
+
+  function init() {
+    requestService = jasmine.createSpyObj('requestService', {
+      generateRequestId: 'request-uuid',
+      configure: {}
+    });
+    rdbService = jasmine.createSpyObj('rdbService', {
+      buildList: createSuccessfulRemoteDataObject$(createPaginatedList(entries))
+    });
+    halService = jasmine.createSpyObj('halService', {
+      getEndpoint: observableOf('external-sources-REST-endpoint')
+    });
+    service = new ExternalSourceService(requestService, rdbService, undefined, undefined, undefined, halService, undefined, undefined, undefined);
+  }
+
+  beforeEach(() => {
+    init();
+  });
+
+  describe('getExternalSourceEntries', () => {
+    let result;
+
+    beforeEach(() => {
+      result = service.getExternalSourceEntries('test');
+    });
+
+    it('should configure a GetRequest', () => {
+      expect(requestService.configure).toHaveBeenCalledWith(jasmine.any(GetRequest));
+    });
+
+    it('should return the entries', () => {
+      result.subscribe((resultRD) => {
+        expect(resultRD.payload.page).toBe(entries);
+      });
+    });
+  });
+});

src/app/core/data/external-source.service.ts

@@ -0,0 +1,85 @@
+import { Injectable } from '@angular/core';
+import { DataService } from './data.service';
+import { ExternalSource } from '../shared/external-source.model';
+import { RequestService } from './request.service';
+import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
+import { NormalizedObjectBuildService } from '../cache/builders/normalized-object-build.service';
+import { Store } from '@ngrx/store';
+import { CoreState } from '../core.reducers';
+import { ObjectCacheService } from '../cache/object-cache.service';
+import { HALEndpointService } from '../shared/hal-endpoint.service';
+import { NotificationsService } from '../../shared/notifications/notifications.service';
+import { HttpClient } from '@angular/common/http';
+import { FindListOptions, GetRequest } from './request.models';
+import { Observable } from 'rxjs/internal/Observable';
+import { distinctUntilChanged, map, switchMap } from 'rxjs/operators';
+import { PaginatedSearchOptions } from '../../shared/search/paginated-search-options.model';
+import { hasValue, isNotEmptyOperator } from '../../shared/empty.util';
+import { configureRequest } from '../shared/operators';
+import { RemoteData } from './remote-data';
+import { PaginatedList } from './paginated-list';
+import { ExternalSourceEntry } from '../shared/external-source-entry.model';
+import { DefaultChangeAnalyzer } from './default-change-analyzer.service';
+
+/**
+ * A service handling all external source requests
+ */
+@Injectable()
+export class ExternalSourceService extends DataService<ExternalSource> {
+  protected linkPath = 'externalsources';
+
+  constructor(
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected dataBuildService: NormalizedObjectBuildService,
+    protected store: Store<CoreState>,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected notificationsService: NotificationsService,
+    protected http: HttpClient,
+    protected comparator: DefaultChangeAnalyzer<ExternalSource>) {
+    super();
+  }
+
+  /**
+   * Get the endpoint to browse external sources
+   * @param options
+   * @param linkPath
+   */
+  getBrowseEndpoint(options: FindListOptions = {}, linkPath: string = this.linkPath): Observable<string> {
+    return this.halService.getEndpoint(linkPath);
+  }
+
+  /**
+   * Get the endpoint for an external source's entries
+   * @param externalSourceId  The id of the external source to fetch entries for
+   */
+  getEntriesEndpoint(externalSourceId: string): Observable<string> {
+    return this.getBrowseEndpoint().pipe(
+      map((href) => this.getIDHref(href, externalSourceId)),
+      switchMap((href) => this.halService.getEndpoint('entries', href))
+    );
+  }
+
+  /**
+   * Get the entries for an external source
+   * @param externalSourceId  The id of the external source to fetch entries for
+   * @param searchOptions     The search options to limit results to
+   */
+  getExternalSourceEntries(externalSourceId: string, searchOptions?: PaginatedSearchOptions): Observable<RemoteData<PaginatedList<ExternalSourceEntry>>> {
+    const requestUuid = this.requestService.generateRequestId();
+
+    const href$ = this.getEntriesEndpoint(externalSourceId).pipe(
+      isNotEmptyOperator(),
+      distinctUntilChanged(),
+      map((endpoint: string) => hasValue(searchOptions) ? searchOptions.toRestUrl(endpoint) : endpoint)
+    );
+
+    href$.pipe(
+      map((endpoint: string) => new GetRequest(requestUuid, endpoint)),
+      configureRequest(this.requestService)
+    ).subscribe();
+
+    return this.rdbService.buildList(href$);
+  }
+}

src/app/core/data/lookup-relation.service.spec.ts

@@ -0,0 +1,116 @@
+import { LookupRelationService } from './lookup-relation.service';
+import { ExternalSourceService } from './external-source.service';
+import { SearchService } from '../shared/search/search.service';
+import { createPaginatedList, createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { PaginatedList } from './paginated-list';
+import { PageInfo } from '../shared/page-info.model';
+import { PaginatedSearchOptions } from '../../shared/search/paginated-search-options.model';
+import { RelationshipOptions } from '../../shared/form/builder/models/relationship-options.model';
+import { SearchResult } from '../../shared/search/search-result.model';
+import { Item } from '../shared/item.model';
+import { skip, take } from 'rxjs/operators';
+import { ExternalSource } from '../shared/external-source.model';
+
+describe('LookupRelationService', () => {
+  let service: LookupRelationService;
+  let externalSourceService: ExternalSourceService;
+  let searchService: SearchService;
+
+  const totalExternal = 8;
+  const optionsWithQuery = new PaginatedSearchOptions({ query: 'test-query' });
+  const relationship = Object.assign(new RelationshipOptions(), {
+    filter: 'test-filter',
+    configuration: 'test-configuration'
+  });
+  const localResults = [
+    Object.assign(new SearchResult(), {
+      indexableObject: Object.assign(new Item(), {
+        uuid: 'test-item-uuid',
+        handle: 'test-item-handle'
+      })
+    })
+  ];
+  const externalSource = Object.assign(new ExternalSource(), {
+    id: 'orcidV2',
+    name: 'orcidV2',
+    hierarchical: false
+  });
+
+  function init() {
+    externalSourceService = jasmine.createSpyObj('externalSourceService', {
+      getExternalSourceEntries: createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo({ elementsPerPage: 1, totalElements: totalExternal, totalPages: totalExternal, currentPage: 1 }), [{}]))
+    });
+    searchService = jasmine.createSpyObj('searchService', {
+      search: createSuccessfulRemoteDataObject$(createPaginatedList(localResults))
+    });
+    service = new LookupRelationService(externalSourceService, searchService);
+  }
+
+  beforeEach(() => {
+    init();
+  });
+
+  describe('getLocalResults', () => {
+    let result;
+
+    beforeEach(() => {
+      result = service.getLocalResults(relationship, optionsWithQuery);
+    });
+
+    it('should return the local results', () => {
+      result.subscribe((resultsRD) => {
+        expect(resultsRD.payload.page).toBe(localResults);
+      });
+    });
+
+    it('should set the searchConfig to contain a fixedFilter and configuration', () => {
+      expect(service.searchConfig).toEqual(Object.assign(new PaginatedSearchOptions({}), optionsWithQuery,
+        { fixedFilter: relationship.filter, configuration: relationship.searchConfiguration }
+      ));
+    });
+  });
+
+  describe('getTotalLocalResults', () => {
+    let result;
+
+    beforeEach(() => {
+      result = service.getTotalLocalResults(relationship, optionsWithQuery);
+    });
+
+    it('should start with 0', () => {
+      result.pipe(take(1)).subscribe((amount) => {
+        expect(amount).toEqual(0)
+      });
+    });
+
+    it('should return the correct total amount', () => {
+      result.pipe(skip(1)).subscribe((amount) => {
+        expect(amount).toEqual(localResults.length)
+      });
+    });
+
+    it('should not set searchConfig', () => {
+      expect(service.searchConfig).toBeUndefined();
+    });
+  });
+
+  describe('getTotalExternalResults', () => {
+    let result;
+
+    beforeEach(() => {
+      result = service.getTotalExternalResults(externalSource, optionsWithQuery);
+    });
+
+    it('should start with 0', () => {
+      result.pipe(take(1)).subscribe((amount) => {
+        expect(amount).toEqual(0)
+      });
+    });
+
+    it('should return the correct total amount', () => {
+      result.pipe(skip(1)).subscribe((amount) => {
+        expect(amount).toEqual(totalExternal)
+      });
+    });
+  });
+});

src/app/core/data/lookup-relation.service.ts

@@ -0,0 +1,94 @@
+import { ExternalSourceService } from './external-source.service';
+import { SearchService } from '../shared/search/search.service';
+import { concat, map, multicast, startWith, take, takeWhile } from 'rxjs/operators';
+import { PaginatedSearchOptions } from '../../shared/search/paginated-search-options.model';
+import { ReplaySubject } from 'rxjs/internal/ReplaySubject';
+import { RemoteData } from './remote-data';
+import { PaginatedList } from './paginated-list';
+import { SearchResult } from '../../shared/search/search-result.model';
+import { DSpaceObject } from '../shared/dspace-object.model';
+import { RelationshipOptions } from '../../shared/form/builder/models/relationship-options.model';
+import { Observable } from 'rxjs/internal/Observable';
+import { Item } from '../shared/item.model';
+import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
+import { getAllSucceededRemoteData, getRemoteDataPayload } from '../shared/operators';
+import { Injectable } from '@angular/core';
+import { ExternalSource } from '../shared/external-source.model';
+import { ExternalSourceEntry } from '../shared/external-source-entry.model';
+
+/**
+ * A service for retrieving local and external entries information during a relation lookup
+ */
+@Injectable()
+export class LookupRelationService {
+  /**
+   * The search config last used for retrieving local results
+   */
+  public searchConfig: PaginatedSearchOptions;
+
+  /**
+   * Pagination options for retrieving exactly one result
+   */
+  private singleResultOptions = Object.assign(new PaginationComponentOptions(), {
+    id: 'single-result-options',
+    pageSize: 1
+  });
+
+  constructor(protected externalSourceService: ExternalSourceService,
+              protected searchService: SearchService) {
+  }
+
+  /**
+   * Retrieve the available local entries for a relationship
+   * @param relationship    Relationship options
+   * @param searchOptions   Search options to filter results
+   * @param setSearchConfig Optionally choose if we should store the used search config in a local variable (defaults to true)
+   */
+  getLocalResults(relationship: RelationshipOptions, searchOptions: PaginatedSearchOptions, setSearchConfig = true): Observable<RemoteData<PaginatedList<SearchResult<Item>>>> {
+    const newConfig = Object.assign(new PaginatedSearchOptions({}), searchOptions,
+      { fixedFilter: relationship.filter, configuration: relationship.searchConfiguration }
+    );
+    if (setSearchConfig) {
+      this.searchConfig = newConfig;
+    }
+    return this.searchService.search(newConfig).pipe(
+      /* Make sure to only listen to the first x results, until loading is finished */
+      /* TODO: in Rxjs 6.4.0 and up, we can replace this with takeWhile(predicate, true) - see https://stackoverflow.com/a/44644237 */
+      multicast(
+        () => new ReplaySubject(1),
+        (subject) => subject.pipe(
+          takeWhile((rd: RemoteData<PaginatedList<SearchResult<DSpaceObject>>>) => rd.isLoading),
+          concat(subject.pipe(take(1)))
+        )
+      ) as any
+    ) as Observable<RemoteData<PaginatedList<SearchResult<Item>>>>;
+  }
+
+  /**
+   * Calculate the total local entries available for the given relationship
+   * @param relationship  Relationship options
+   * @param searchOptions Search options to filter results
+   */
+  getTotalLocalResults(relationship: RelationshipOptions, searchOptions: PaginatedSearchOptions): Observable<number> {
+    return this.getLocalResults(relationship, Object.assign(new PaginatedSearchOptions({}), searchOptions, { pagination: this.singleResultOptions }), false).pipe(
+      getAllSucceededRemoteData(),
+      getRemoteDataPayload(),
+      map((results: PaginatedList<SearchResult<Item>>) => results.totalElements),
+      startWith(0)
+    );
+  }
+
+  /**
+   * Calculate the total external entries available for a given external source
+   * @param externalSource  External Source
+   * @param searchOptions   Search options to filter results
+   */
+  getTotalExternalResults(externalSource: ExternalSource, searchOptions: PaginatedSearchOptions): Observable<number> {
+    return this.externalSourceService.getExternalSourceEntries(externalSource.id, Object.assign(new PaginatedSearchOptions({}), searchOptions, { pagination: this.singleResultOptions })).pipe(
+      getAllSucceededRemoteData(),
+      getRemoteDataPayload(),
+      map((results: PaginatedList<ExternalSourceEntry>) => results.totalElements),
+      startWith(0)
+    );
+  }
+}

src/app/core/data/relationship.service.spec.ts

@@ -123,8 +123,8 @@ describe('RelationshipService', () => {
     it('should clear the related items their cache', () => {
       expect(objectCache.remove).toHaveBeenCalledWith(relatedItem1.self);
       expect(objectCache.remove).toHaveBeenCalledWith(item.self);
-      expect(requestService.removeByHrefSubstring).toHaveBeenCalledWith(relatedItem1.self);
+      expect(requestService.removeByHrefSubstring).toHaveBeenCalledWith(relatedItem1.uuid);
-      expect(requestService.removeByHrefSubstring).toHaveBeenCalledWith(item.self);
+      expect(requestService.removeByHrefSubstring).toHaveBeenCalledWith(item.uuid);
     });
   });
 

src/app/core/data/relationship.service.ts

@@ -1,46 +1,35 @@
+import { HttpClient, HttpHeaders } from '@angular/common/http';
 import { Injectable } from '@angular/core';
-import { RequestService } from './request.service';
+import { MemoizedSelector, select, Store } from '@ngrx/store';
-import { HALEndpointService } from '../shared/hal-endpoint.service';
-import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
-import { hasValue, hasValueOperator, isNotEmpty, isNotEmptyOperator } from '../../shared/empty.util';
-import { distinctUntilChanged, filter, map, mergeMap, startWith, switchMap, take, tap } from 'rxjs/operators';
-import {
-  configureRequest,
-  getRemoteDataPayload,
-  getResponseFromEntry,
-  getSucceededRemoteData
-} from '../shared/operators';
-import { DeleteRequest, FindListOptions, PostRequest, RestRequest } from './request.models';
-import { Observable } from 'rxjs/internal/Observable';
-import { RestResponse } from '../cache/response.models';
-import { Item } from '../shared/item.model';
-import { Relationship } from '../shared/item-relationships/relationship.model';
-import { RelationshipType } from '../shared/item-relationships/relationship-type.model';
-import { RemoteData } from './remote-data';
 import { combineLatest, combineLatest as observableCombineLatest } from 'rxjs';
+import { distinctUntilChanged, filter, map, mergeMap, startWith, switchMap, take, tap } from 'rxjs/operators';
+import { compareArraysUsingIds, paginatedRelationsToItems, relationsToItems } from '../../+item-page/simple/item-types/shared/item-relationships-utils';
+import { AppState, keySelector } from '../../app.reducer';
+import { hasValue, hasValueOperator, isNotEmpty, isNotEmptyOperator } from '../../shared/empty.util';
+import { ReorderableRelationship } from '../../shared/form/builder/ds-dynamic-form-ui/existing-metadata-list-element/existing-metadata-list-element.component';
+import { RemoveNameVariantAction, SetNameVariantAction } from '../../shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/name-variant.actions';
+import { NameVariantListState } from '../../shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/name-variant.reducer';
+import { NotificationsService } from '../../shared/notifications/notifications.service';
+import { NormalizedObjectBuildService } from '../cache/builders/normalized-object-build.service';
+import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
+import { configureRequest, getRemoteDataPayload, getResponseFromEntry, getSucceededRemoteData } from '../shared/operators';
+import { SearchParam } from '../cache/models/search-param.model';
+import { ObjectCacheService } from '../cache/object-cache.service';
+import { DeleteRequest, FindListOptions, PostRequest, RestRequest } from './request.models';
+import { RestResponse } from '../cache/response.models';
+import { CoreState } from '../core.reducers';
+import { HttpOptions } from '../dspace-rest-v2/dspace-rest-v2.service';
+import { HALEndpointService } from '../shared/hal-endpoint.service';
+import { RelationshipType } from '../shared/item-relationships/relationship-type.model';
+import { RemoteData, RemoteDataState } from './remote-data';
 import { PaginatedList } from './paginated-list';
 import { ItemDataService } from './item-data.service';
-import {
+import { Relationship } from '../shared/item-relationships/relationship.model';
-  compareArraysUsingIds,
+import { Item } from '../shared/item.model';
-  paginatedRelationsToItems,
-  relationsToItems
-} from '../../+item-page/simple/item-types/shared/item-relationships-utils';
-import { ObjectCacheService } from '../cache/object-cache.service';
 import { DataService } from './data.service';
-import { NormalizedObjectBuildService } from '../cache/builders/normalized-object-build.service';
-import { MemoizedSelector, select, Store } from '@ngrx/store';
-import { CoreState } from '../core.reducers';
-import { NotificationsService } from '../../shared/notifications/notifications.service';
-import { HttpClient, HttpHeaders } from '@angular/common/http';
 import { DefaultChangeAnalyzer } from './default-change-analyzer.service';
-import { SearchParam } from '../cache/models/search-param.model';
+import { RequestService } from './request.service';
-import { HttpOptions } from '../dspace-rest-v2/dspace-rest-v2.service';
+import { Observable } from 'rxjs/internal/Observable';
-import { AppState, keySelector } from '../../app.reducer';
-import { NameVariantListState } from '../../shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/name-variant.reducer';
-import {
-  RemoveNameVariantAction,
-  SetNameVariantAction
-} from '../../shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/name-variant.actions';
 
 const relationshipListsStateSelector = (state: AppState) => state.relationshipLists;
 
@@ -140,9 +129,9 @@ export class RelationshipService extends DataService<Relationship> {
     this.findById(relationshipId).pipe(
       getSucceededRemoteData(),
       getRemoteDataPayload(),
-      switchMap((relationship: Relationship) => combineLatest(
+      switchMap((rel: Relationship) => combineLatest(
-        relationship.leftItem.pipe(getSucceededRemoteData(), getRemoteDataPayload()),
+        rel.leftItem.pipe(getSucceededRemoteData(), getRemoteDataPayload()),
-        relationship.rightItem.pipe(getSucceededRemoteData(), getRemoteDataPayload())
+        rel.rightItem.pipe(getSucceededRemoteData(), getRemoteDataPayload())
         )
       ),
       take(1)
@@ -158,10 +147,10 @@ export class RelationshipService extends DataService<Relationship> {
    */
   private removeRelationshipItemsFromCache(item) {
     this.objectCache.remove(item.self);
-    this.requestService.removeByHrefSubstring(item.self);
+    this.requestService.removeByHrefSubstring(item.uuid);
     combineLatest(
       this.objectCache.hasBySelfLinkObservable(item.self),
-      this.requestService.hasByHrefObservable(item.self)
+      this.requestService.hasByHrefObservable(item.uuid)
     ).pipe(
       filter(([existsInOC, existsInRC]) => !existsInOC && !existsInRC),
       take(1),
@@ -367,7 +356,7 @@ export class RelationshipService extends DataService<Relationship> {
    * @param nameVariant The name variant to set for the matching relationship
    */
   public updateNameVariant(item1: Item, item2: Item, relationshipLabel: string, nameVariant: string): Observable<RemoteData<Relationship>> {
-    return this.getRelationshipByItemsAndLabel(item1, item2, relationshipLabel)
+    const update$: Observable<RemoteData<Relationship>> = this.getRelationshipByItemsAndLabel(item1, item2, relationshipLabel)
       .pipe(
         switchMap((relation: Relationship) =>
           relation.relationshipType.pipe(
@@ -388,14 +377,44 @@ export class RelationshipService extends DataService<Relationship> {
           }
           return this.update(updatedRelationship);
         }),
-        // skipWhile((relationshipRD: RemoteData<Relationship>) => !relationshipRD.isSuccessful)
+      );
-        tap((relationshipRD: RemoteData<Relationship>) => {
+
-          if (relationshipRD.hasSucceeded) {
+    update$.pipe(
+      filter((relationshipRD: RemoteData<Relationship>) => relationshipRD.state === RemoteDataState.RequestPending),
+      take(1),
+    ).subscribe(() => {
       this.removeRelationshipItemsFromCache(item1);
       this.removeRelationshipItemsFromCache(item2);
+    });
+
+    return update$
   }
-        }),
+
-      )
+  /**
+   * Method to update the the right or left place of a relationship
+   * The useLeftItem field in the reorderable relationship determines which place should be updated
+   * @param reoRel
+   */
+  public updatePlace(reoRel: ReorderableRelationship): Observable<RemoteData<Relationship>> {
+    let updatedRelationship;
+    if (reoRel.useLeftItem) {
+      updatedRelationship = Object.assign(new Relationship(), reoRel.relationship, { rightPlace: reoRel.newIndex });
+    } else {
+      updatedRelationship = Object.assign(new Relationship(), reoRel.relationship, { leftPlace: reoRel.newIndex });
+    }
+
+    const update$ = this.update(updatedRelationship);
+
+    update$.pipe(
+      filter((relationshipRD: RemoteData<Relationship>) => relationshipRD.state === RemoteDataState.ResponsePending),
+      take(1),
+    ).subscribe((relationshipRD: RemoteData<Relationship>) => {
+      if (relationshipRD.state === RemoteDataState.ResponsePending) {
+        this.removeRelationshipItemsFromCacheByRelationship(reoRel.relationship.id);
+      }
+    });
+
+    return update$;
   }
 
 }

src/app/core/data/site-data.service.ts

@@ -22,11 +22,9 @@ import { getSucceededRemoteData } from '../shared/operators';
  * Service responsible for handling requests related to the Site object
  */
 @Injectable()
-export class SiteDataService extends DataService<Site> {
+export class SiteDataService extends DataService<Site> {​
-​
   protected linkPath = 'sites';
   protected forceBypassCache = false;
-​
 
   constructor(
     protected requestService: RequestService,
@@ -42,8 +40,6 @@ export class SiteDataService extends DataService<Site> {
     super();
   }
 
-​
-
   /**
    * Get the endpoint for browsing the site object
    * @param {FindListOptions} options
@@ -53,8 +49,6 @@ export class SiteDataService extends DataService<Site> {
     return this.halService.getEndpoint(this.linkPath);
   }
 
-​
-
   /**
    * Retrieve the Site Object
    */

src/app/core/services/route.service.ts

@@ -176,10 +176,20 @@ export class RouteService {
     );
   }
 
+  /**
+   * Add a parameter to the current route
+   * @param key   The parameter name
+   * @param value The parameter value
+   */
   public addParameter(key, value) {
     this.store.dispatch(new AddParameterAction(key, value));
   }
 
+  /**
+   * Set a parameter in the current route (overriding the previous value)
+   * @param key   The parameter name
+   * @param value The parameter value
+   */
   public setParameter(key, value) {
     this.store.dispatch(new SetParameterAction(key, value));
   }

src/app/core/shared/external-source-entry.model.ts

@@ -0,0 +1,43 @@
+import { MetadataMap } from './metadata.models';
+import { ResourceType } from './resource-type';
+import { ListableObject } from '../../shared/object-collection/shared/listable-object.model';
+import { GenericConstructor } from './generic-constructor';
+
+/**
+ * Model class for a single entry from an external source
+ */
+export class ExternalSourceEntry extends ListableObject {
+  static type = new ResourceType('externalSourceEntry');
+
+  /**
+   * Unique identifier
+   */
+  id: string;
+
+  /**
+   * The value to display
+   */
+  display: string;
+
+  /**
+   * The value to store the entry with
+   */
+  value: string;
+
+  /**
+   * Metadata of the entry
+   */
+  metadata: MetadataMap;
+
+  /**
+   * The link to the rest endpoint where this External Source Entry can be found
+   */
+  self: string;
+
+  /**
+   * Method that returns as which type of object this object should be rendered
+   */
+  getRenderTypes(): Array<string | GenericConstructor<ListableObject>> {
+    return [this.constructor as GenericConstructor<ListableObject>];
+  }
+}

src/app/core/shared/external-source.model.ts

@@ -0,0 +1,29 @@
+import { ResourceType } from './resource-type';
+import { CacheableObject } from '../cache/object-cache.reducer';
+
+/**
+ * Model class for an external source
+ */
+export class ExternalSource extends CacheableObject {
+  static type = new ResourceType('externalsource');
+
+  /**
+   * Unique identifier
+   */
+  id: string;
+
+  /**
+   * The name of this external source
+   */
+  name: string;
+
+  /**
+   * Is the source hierarchical?
+   */
+  hierarchical: boolean;
+
+  /**
+   * The link to the rest endpoint where this External Source can be found
+   */
+  self: string;
+}

src/app/core/shared/search/search.service.ts

@@ -117,8 +117,7 @@ export class SearchService implements OnDestroy {
    * @param responseMsToLive The amount of milliseconds for the response to live in cache
    * @returns {Observable<RequestEntry>} Emits an observable with the request entries
    */
-  searchEntries(searchOptions?: PaginatedSearchOptions, responseMsToLive?:number)
+  searchEntries(searchOptions?: PaginatedSearchOptions, responseMsToLive?: number): Observable<{searchOptions: PaginatedSearchOptions, requestEntry: RequestEntry}> {
-    :Observable<{searchOptions: PaginatedSearchOptions, requestEntry: RequestEntry}> {
 
     const hrefObs = this.getEndpoint(searchOptions);
 
@@ -152,8 +151,7 @@ export class SearchService implements OnDestroy {
    * @param searchEntries: The request entries from the search method
    * @returns {Observable<RemoteData<PaginatedList<SearchResult<DSpaceObject>>>>} Emits a paginated list with all search results found
    */
-  getPaginatedResults(searchEntries:Observable<{ searchOptions:PaginatedSearchOptions, requestEntry:RequestEntry }>)
+  getPaginatedResults(searchEntries: Observable<{ searchOptions: PaginatedSearchOptions, requestEntry: RequestEntry }>): Observable<RemoteData<PaginatedList<SearchResult<DSpaceObject>>>> {
-    :Observable<RemoteData<PaginatedList<SearchResult<DSpaceObject>>>> {
     const requestEntryObs: Observable<RequestEntry> = searchEntries.pipe(
       map((entry) => entry.requestEntry),
     );

src/app/entity-groups/research-entities/metadata-representations/person/person-item-metadata-list-element.component.ts

@@ -1,4 +1,4 @@
-import { Component } from '@angular/core';
+import { Component, OnInit } from '@angular/core';
 import { metadataRepresentationComponent } from '../../../../shared/metadata-representation/metadata-representation.decorator';
 import { MetadataRepresentationType } from '../../../../core/shared/metadata-representation/metadata-representation.model';
 import { ItemMetadataRepresentationListElementComponent } from '../../../../shared/object-list/metadata-representation-list-element/item/item-metadata-representation-list-element.component';

src/app/entity-groups/research-entities/research-entities.module.ts

@@ -25,6 +25,7 @@ import { PersonInputSuggestionsComponent } from './submission/item-list-elements
 import { NameVariantModalComponent } from './submission/name-variant-modal/name-variant-modal.component';
 import { OrgUnitInputSuggestionsComponent } from './submission/item-list-elements/org-unit/org-unit-suggestions/org-unit-input-suggestions.component';
 import { OrgUnitSearchResultListSubmissionElementComponent } from './submission/item-list-elements/org-unit/org-unit-search-result-list-submission-element.component';
+import { ExternalSourceEntryListSubmissionElementComponent } from './submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component';
 
 const ENTRY_COMPONENTS = [
   OrgUnitComponent,
@@ -48,7 +49,8 @@ const ENTRY_COMPONENTS = [
   PersonInputSuggestionsComponent,
   NameVariantModalComponent,
   OrgUnitSearchResultListSubmissionElementComponent,
-  OrgUnitInputSuggestionsComponent
+  OrgUnitInputSuggestionsComponent,
+  ExternalSourceEntryListSubmissionElementComponent
 ];
 
 @NgModule({

src/app/entity-groups/research-entities/submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component.html

@@ -0,0 +1,2 @@
+<div>{{object.display}}</div>
+<div *ngIf="uri"><a target="_blank" [href]="uri.value">{{uri.value}}</a></div>

src/app/entity-groups/research-entities/submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component.spec.ts

@@ -0,0 +1,47 @@
+import { ExternalSourceEntryListSubmissionElementComponent } from './external-source-entry-list-submission-element.component';
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { ExternalSourceEntry } from '../../../../../core/shared/external-source-entry.model';
+import { TranslateModule } from '@ngx-translate/core';
+import { NO_ERRORS_SCHEMA } from '@angular/core';
+
+describe('ExternalSourceEntryListSubmissionElementComponent', () => {
+  let component: ExternalSourceEntryListSubmissionElementComponent;
+  let fixture: ComponentFixture<ExternalSourceEntryListSubmissionElementComponent>;
+
+  const uri = 'https://orcid.org/0001-0001-0001-0001';
+  const entry = Object.assign(new ExternalSourceEntry(), {
+    id: '0001-0001-0001-0001',
+    display: 'John Doe',
+    value: 'John, Doe',
+    metadata: {
+      'dc.identifier.uri': [
+        {
+          value: uri
+        }
+      ]
+    }
+  });
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ExternalSourceEntryListSubmissionElementComponent],
+      imports: [TranslateModule.forRoot()],
+      schemas: [NO_ERRORS_SCHEMA]
+    }).compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(ExternalSourceEntryListSubmissionElementComponent);
+    component = fixture.componentInstance;
+    component.object = entry;
+    fixture.detectChanges();
+  });
+
+  it('should display the entry\'s display value', () => {
+    expect(fixture.nativeElement.textContent).toContain(entry.display);
+  });
+
+  it('should display the entry\'s uri', () => {
+    expect(fixture.nativeElement.textContent).toContain(uri);
+  });
+});

src/app/entity-groups/research-entities/submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component.ts

@@ -0,0 +1,28 @@
+import { AbstractListableElementComponent } from '../../../../../shared/object-collection/shared/object-collection-element/abstract-listable-element.component';
+import { ExternalSourceEntry } from '../../../../../core/shared/external-source-entry.model';
+import { listableObjectComponent } from '../../../../../shared/object-collection/shared/listable-object/listable-object.decorator';
+import { ViewMode } from '../../../../../core/shared/view-mode.model';
+import { Context } from '../../../../../core/shared/context.model';
+import { Component, OnInit } from '@angular/core';
+import { Metadata } from '../../../../../core/shared/metadata.utils';
+import { MetadataValue } from '../../../../../core/shared/metadata.models';
+
+@listableObjectComponent(ExternalSourceEntry, ViewMode.ListElement, Context.SubmissionModal)
+@Component({
+  selector: 'ds-external-source-entry-list-submission-element',
+  styleUrls: ['./external-source-entry-list-submission-element.component.scss'],
+  templateUrl: './external-source-entry-list-submission-element.component.html'
+})
+/**
+ * The component for displaying a list element of an external source entry
+ */
+export class ExternalSourceEntryListSubmissionElementComponent extends AbstractListableElementComponent<ExternalSourceEntry> implements OnInit {
+  /**
+   * The metadata value for the object's uri
+   */
+  uri: MetadataValue;
+
+  ngOnInit(): void {
+    this.uri = Metadata.first(this.object.metadata, 'dc.identifier.uri');
+  }
+}

src/app/entity-groups/research-entities/submission/name-variant-modal/name-variant-modal.component.ts

@@ -10,7 +10,13 @@ import { NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';
   templateUrl: './name-variant-modal.component.html',
   styleUrls: ['./name-variant-modal.component.scss']
 })
+/**
+ * The component for the modal to add a name variant to an item
+ */
 export class NameVariantModalComponent {
+  /**
+   * The name variant
+   */
   @Input() value: string;
 
   constructor(public modal: NgbActiveModal) {

src/app/shared/form/builder/ds-dynamic-form-ui/ds-dynamic-form-control-container.component.html

@@ -53,16 +53,15 @@
 
 
     <div *ngIf="hasRelationLookup" class="mt-3">
-        <ul class="list-unstyled">
+        <ul class="list-unstyled" cdkDropList (cdkDropListDropped)="moveSelection($event)">
-            <li *ngFor="let value of ( selectedValues$ | async)">
+            <ds-existing-metadata-list-element cdkDrag
-              <button type="button" class="close float-left" aria-label="Close button"
+                                               *ngFor="let reorderable of reorderables; trackBy: trackReorderable"
-                      (click)="removeSelection(value.selectedResult)">
+                                               [reoRel]="reorderable"
-                  <span aria-hidden="true">&times;</span>
+                                               [submissionItem]="item"
-              </button>
+                                               [listId]="listId"
-              <span class="d-inline-block align-middle ml-1">
+                                               [metadataFields]="model.metadataFields"
-              <ds-metadata-representation-loader [mdRepresentation]="value.mdRep"></ds-metadata-representation-loader>
+                                               [relationshipOptions]="model.relationship">
-          </span>
+            </ds-existing-metadata-list-element>
-            </li>
         </ul>
     </div>
 </div>

src/app/shared/form/builder/ds-dynamic-form-ui/ds-dynamic-form-control-container.component.ts

@@ -1,12 +1,13 @@
 import {
-  ChangeDetectionStrategy,
+  ChangeDetectionStrategy, ChangeDetectorRef,
   Component,
   ComponentFactoryResolver,
   ContentChildren,
   EventEmitter,
   Input,
   NgZone,
-  OnChanges, OnDestroy,
+  OnChanges,
+  OnDestroy,
   OnInit,
   Output,
   QueryList,
@@ -49,7 +50,10 @@ import {
   DynamicNGBootstrapTimePickerComponent
 } from '@ng-dynamic-forms/ui-ng-bootstrap';
 import { TranslateService } from '@ngx-translate/core';
-import { MetadataRepresentation } from '../../../../core/shared/metadata-representation/metadata-representation.model';
+import {
+  Reorderable,
+  ReorderableRelationship
+} from './existing-metadata-list-element/existing-metadata-list-element.component';
 
 import { DYNAMIC_FORM_CONTROL_TYPE_TYPEAHEAD } from './models/typeahead/dynamic-typeahead.model';
 import { DYNAMIC_FORM_CONTROL_TYPE_SCROLLABLE_DROPDOWN } from './models/scrollable-dropdown/dynamic-scrollable-dropdown.model';
@@ -71,9 +75,8 @@ import { DsDynamicFormArrayComponent } from './models/array-group/dynamic-form-a
 import { DsDynamicRelationGroupComponent } from './models/relation-group/dynamic-relation-group.components';
 import { DYNAMIC_FORM_CONTROL_TYPE_RELATION_GROUP } from './models/relation-group/dynamic-relation-group.model';
 import { DsDatePickerInlineComponent } from './models/date-picker-inline/dynamic-date-picker-inline.component';
-import { map, switchMap, take, tap } from 'rxjs/operators';
+import { map, startWith, switchMap, find } from 'rxjs/operators';
-import { combineLatest as observableCombineLatest, Observable, Subscription } from 'rxjs';
+import { combineLatest as observableCombineLatest, Observable, of as observableOf, Subscription } from 'rxjs';
-import { SelectableListState } from '../../../object-list/selectable-list/selectable-list.reducer';
 import { SearchResult } from '../../../search/search-result.model';
 import { DSpaceObject } from '../../../../core/shared/dspace-object.model';
 import { NgbModal, NgbModalRef } from '@ng-bootstrap/ng-bootstrap';
@@ -82,23 +85,18 @@ import { SelectableListService } from '../../../object-list/selectable-list/sele
 import { DsDynamicDisabledComponent } from './models/disabled/dynamic-disabled.component';
 import { DYNAMIC_FORM_CONTROL_TYPE_DISABLED } from './models/disabled/dynamic-disabled.model';
 import { DsDynamicLookupRelationModalComponent } from './relation-lookup-modal/dynamic-lookup-relation-modal.component';
-import {
+import { getAllSucceededRemoteData, getRemoteDataPayload, getSucceededRemoteData } from '../../../../core/shared/operators';
-  getAllSucceededRemoteData,
-  getRemoteDataPayload,
-  getSucceededRemoteData
-} from '../../../../core/shared/operators';
 import { RemoteData } from '../../../../core/data/remote-data';
 import { Item } from '../../../../core/shared/item.model';
 import { ItemDataService } from '../../../../core/data/item-data.service';
-import { RemoveRelationshipAction } from './relation-lookup-modal/relationship.actions';
 import { Store } from '@ngrx/store';
 import { AppState } from '../../../../app.reducer';
 import { SubmissionObjectDataService } from '../../../../core/submission/submission-object-data.service';
 import { SubmissionObject } from '../../../../core/submission/models/submission-object.model';
 import { PaginatedList } from '../../../../core/data/paginated-list';
 import { ItemSearchResult } from '../../../object-collection/shared/item-search-result.model';
-import { ItemMetadataRepresentation } from '../../../../core/shared/metadata-representation/item/item-metadata-representation.model';
+import { CdkDragDrop, moveItemInArray } from '@angular/cdk/drag-drop';
-import { MetadataValue } from '../../../../core/shared/metadata.models';
+import { Relationship } from '../../../../core/shared/item-relationships/relationship.model';
 
 export function dsDynamicFormControlMapFn(model: DynamicFormControlModel): Type<DynamicFormControl> | null {
   switch (model.type) {
@@ -182,16 +180,14 @@ export class DsDynamicFormControlContainerComponent extends DynamicFormControlCo
   @Input() hasErrorMessaging = false;
   @Input() layout = null as DynamicFormLayout;
   @Input() model: any;
-  relationships$: Observable<Array<SearchResult<Item>>>;
+  reorderables$: Observable<ReorderableRelationship[]>;
+  reorderables: ReorderableRelationship[];
   hasRelationLookup: boolean;
   modalRef: NgbModalRef;
   item: Item;
   listId: string;
   searchConfig: string;
-  selectedValues$: Observable<Array<{
+
-    selectedResult: SearchResult<Item>,
-    mdRep: MetadataRepresentation
-  }>>;
   /**
    * List of subscriptions to unsubscribe from
    */
@@ -224,7 +220,8 @@ export class DsDynamicFormControlContainerComponent extends DynamicFormControlCo
     private relationshipService: RelationshipService,
     private zone: NgZone,
     private store: Store<AppState>,
-    private submissionObjectService: SubmissionObjectDataService
+    private submissionObjectService: SubmissionObjectDataService,
+    private ref: ChangeDetectorRef
   ) {
 
     super(componentFactoryResolver, layoutService, validationService, dynamicFormInstanceService);
@@ -235,44 +232,59 @@ export class DsDynamicFormControlContainerComponent extends DynamicFormControlCo
    */
   ngOnInit(): void {
     this.hasRelationLookup = hasValue(this.model.relationship);
+    this.reorderables = [];
     if (this.hasRelationLookup) {
+
       this.listId = 'list-' + this.model.relationship.relationshipType;
       const item$ = this.submissionObjectService
         .findById(this.model.submissionId).pipe(
           getAllSucceededRemoteData(),
           getRemoteDataPayload(),
-          switchMap((submissionObject: SubmissionObject) => (submissionObject.item as Observable<RemoteData<Item>>).pipe(getAllSucceededRemoteData(), getRemoteDataPayload())));
+          switchMap((submissionObject: SubmissionObject) => (submissionObject.item as Observable<RemoteData<Item>>)
+            .pipe(
+              getAllSucceededRemoteData(),
+              getRemoteDataPayload()
+            )
+          )
+        );
 
       this.subs.push(item$.subscribe((item) => this.item = item));
+      this.reorderables$ = item$.pipe(
+        switchMap((item) => this.relationService.getItemRelationshipsByLabel(item, this.model.relationship.relationshipType)
+          .pipe(
+            getAllSucceededRemoteData(),
+            getRemoteDataPayload(),
+            map((relationshipList: PaginatedList<Relationship>) => relationshipList.page),
+            startWith([]),
+            switchMap((relationships: Relationship[]) =>
+              observableCombineLatest(
+                relationships.map((relationship: Relationship) =>
+                  relationship.leftItem.pipe(
+                    getSucceededRemoteData(),
+                    getRemoteDataPayload(),
+                    map((leftItem: Item) => {
+                      return new ReorderableRelationship(relationship, leftItem.uuid !== this.item.uuid)
+                    }),
+                  )
+                ))),
+            map((relationships: ReorderableRelationship[]) =>
+              relationships
+                .sort((a: Reorderable, b: Reorderable) => {
+                  return Math.sign(a.getPlace() - b.getPlace());
+                })
+            )
+          )
+        )
+      );
+
+      this.subs.push(this.reorderables$.subscribe((rs) => {
+        this.reorderables = rs;
+        this.ref.detectChanges();
+      }));
 
       this.relationService.getRelatedItemsByLabel(this.item, this.model.relationship.relationshipType).pipe(
         map((items: RemoteData<PaginatedList<Item>>) => items.payload.page.map((item) => Object.assign(new ItemSearchResult(), { indexableObject: item }))),
       ).subscribe((relatedItems: Array<SearchResult<Item>>) => this.selectableListService.select(this.listId, relatedItems));
-
-      this.relationships$ = this.selectableListService.getSelectableList(this.listId).pipe(
-        map((listState: SelectableListState) => hasValue(listState) && hasValue(listState.selection) ? listState.selection : []),
-      ) as Observable<Array<SearchResult<Item>>>;
-      this.selectedValues$ =
-        observableCombineLatest(item$, this.relationships$).pipe(
-          map(([item, relatedItems]: [Item, Array<SearchResult<DSpaceObject>>]) => {
-              return relatedItems
-              .map((element: SearchResult<Item>) => {
-                const relationMD: MetadataValue = item.firstMetadata(this.model.relationship.metadataField, { value: element.indexableObject.uuid });
-                if (hasValue(relationMD)) {
-                  const metadataRepresentationMD: MetadataValue = item.firstMetadata(this.model.metadataFields, { authority: relationMD.authority });
-                  return {
-                    selectedResult: element,
-                    mdRep: Object.assign(
-                      new ItemMetadataRepresentation(metadataRepresentationMD),
-                      element.indexableObject
-                    )
-                  };
-                }
-              }).filter(hasValue)
-            }
-          )
-        );
-
     }
   }
 
@@ -334,12 +346,29 @@ export class DsDynamicFormControlContainerComponent extends DynamicFormControlCo
   }
 
   /**
-   * Method to remove a selected relationship from the item
+   * Method to move a relationship inside the list of relationships
-   * @param object The second item in the relationship, the submitted item being the first
+   * This will update the view and update the right or left place field of the relationships in the list
+   * @param event
    */
-  removeSelection(object: SearchResult<Item>) {
+  moveSelection(event: CdkDragDrop<Relationship>) {
-    this.selectableListService.deselectSingle(this.listId, object);
+    this.zone.runOutsideAngular(() => {
-    this.store.dispatch(new RemoveRelationshipAction(this.item, object.indexableObject, this.model.relationship.relationshipType))
+      moveItemInArray(this.reorderables, event.previousIndex, event.currentIndex);
+      const reorderables: Reorderable[] = this.reorderables.map((reo: Reorderable, index: number) => {
+          reo.oldIndex = reo.getPlace();
+          reo.newIndex = index;
+          return reo;
+        }
+      );
+      observableCombineLatest(
+        reorderables.map((rel: ReorderableRelationship) => {
+          if (rel.oldIndex !== rel.newIndex) {
+            return this.relationshipService.updatePlace(rel);
+          } else {
+            return observableOf(undefined) as Observable<RemoteData<Relationship>>;
+          }
+        })
+      ).subscribe();
+    })
   }
 
   /**
@@ -350,4 +379,11 @@ export class DsDynamicFormControlContainerComponent extends DynamicFormControlCo
       .filter((sub) => hasValue(sub))
       .forEach((sub) => sub.unsubscribe());
   }
+
+  /**
+   * Prevent unnecessary rerendering so fields don't lose focus
+   */
+  trackReorderable(index, reorderable: Reorderable) {
+    return hasValue(reorderable) ? reorderable.getId() : undefined;
+  }
 }

src/app/shared/form/builder/ds-dynamic-form-ui/existing-metadata-list-element/existing-metadata-list-element.component.html

@@ -0,0 +1,11 @@
+<li *ngIf="metadataRepresentation">
+    <button type="button" class="close float-left" aria-label="Move button" cdkDragHandle>
+        <i aria-hidden="true" class="fas fa-arrows-alt fa-xs"></i>
+    </button>
+    <button type="button" class="close float-left" aria-label="Close button" (click)="removeSelection()">
+        <span aria-hidden="true">&times;</span>
+    </button>
+    <span class="d-inline-block align-middle ml-1">
+              <ds-metadata-representation-loader [mdRepresentation]="metadataRepresentation"></ds-metadata-representation-loader>
+          </span>
+</li>

src/app/shared/form/builder/ds-dynamic-form-ui/existing-metadata-list-element/existing-metadata-list-element.component.spec.ts

@@ -0,0 +1,92 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { ExistingMetadataListElementComponent, Reorderable, ReorderableRelationship } from './existing-metadata-list-element.component';
+import { NO_ERRORS_SCHEMA } from '@angular/core';
+import { SelectableListService } from '../../../../object-list/selectable-list/selectable-list.service';
+import { select, Store } from '@ngrx/store';
+import { Item } from '../../../../../core/shared/item.model';
+import { Relationship } from '../../../../../core/shared/item-relationships/relationship.model';
+import { RelationshipOptions } from '../../models/relationship-options.model';
+import { createSuccessfulRemoteDataObject$ } from '../../../../testing/utils';
+import { RemoveRelationshipAction } from '../relation-lookup-modal/relationship.actions';
+import { ItemSearchResult } from '../../../../object-collection/shared/item-search-result.model';
+
+describe('ExistingMetadataListElementComponent', () => {
+  let component: ExistingMetadataListElementComponent;
+  let fixture: ComponentFixture<ExistingMetadataListElementComponent>;
+  let selectionService;
+  let store;
+  let listID;
+  let submissionItem;
+  let relationship;
+  let reoRel;
+  let metadataFields;
+  let relationshipOptions;
+  let uuid1;
+  let uuid2;
+  let relatedItem;
+  let leftItemRD$;
+  let rightItemRD$;
+  let relatedSearchResult;
+
+  function init() {
+    uuid1 = '91ce578d-2e63-4093-8c73-3faafd716000';
+    uuid2 = '0e9dba1c-e1c3-4e05-a539-446f08ef57a7';
+    selectionService = jasmine.createSpyObj('selectionService', ['deselectSingle']);
+    store = jasmine.createSpyObj('store', ['dispatch']);
+    listID = '1234-listID';
+    submissionItem = Object.assign(new Item(), { uuid: uuid1 });
+    metadataFields = ['dc.contributor.author'];
+    relationshipOptions = Object.assign(new RelationshipOptions(), { relationshipType: 'isPublicationOfAuthor', filter: 'test.filter', searchConfiguration: 'personConfiguration', nameVariants: true })
+    relatedItem = Object.assign(new Item(), { uuid: uuid2 });
+    leftItemRD$ = createSuccessfulRemoteDataObject$(relatedItem);
+    rightItemRD$ = createSuccessfulRemoteDataObject$(submissionItem);
+    relatedSearchResult = Object.assign(new ItemSearchResult(), { indexableObject: relatedItem });
+
+    relationship = Object.assign(new Relationship(), { leftItem: leftItemRD$, rightItem: rightItemRD$ });
+    reoRel = new ReorderableRelationship(relationship, true);
+  }
+
+  beforeEach(async(() => {
+    init();
+    TestBed.configureTestingModule({
+      declarations: [ExistingMetadataListElementComponent],
+      providers: [
+        { provide: SelectableListService, useValue: selectionService },
+        { provide: Store, useValue: store },
+      ],
+      schemas: [NO_ERRORS_SCHEMA]
+    })
+      .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(ExistingMetadataListElementComponent);
+    component = fixture.componentInstance;
+    component.listId = listID;
+    component.submissionItem = submissionItem;
+    component.reoRel = reoRel;
+    component.metadataFields = metadataFields;
+    component.relationshipOptions = relationshipOptions;
+    fixture.detectChanges();
+    component.ngOnChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+
+  describe('removeSelection', () => {
+    it('should deselect the object in the selectable list service', () => {
+      component.removeSelection();
+      expect(selectionService.deselectSingle).toHaveBeenCalledWith(listID, relatedSearchResult);
+    });
+
+    it('should dispatch a RemoveRelationshipAction', () => {
+      component.removeSelection();
+      const action = new RemoveRelationshipAction(submissionItem, relatedItem, relationshipOptions.relationshipType);
+      expect(store.dispatch).toHaveBeenCalledWith(action);
+
+    });
+  })
+});

src/app/shared/form/builder/ds-dynamic-form-ui/existing-metadata-list-element/existing-metadata-list-element.component.ts

@@ -0,0 +1,123 @@
+import { Component, Input, OnChanges, OnDestroy, OnInit } from '@angular/core';
+import { Item } from '../../../../../core/shared/item.model';
+import { MetadataRepresentation } from '../../../../../core/shared/metadata-representation/metadata-representation.model';
+import { getAllSucceededRemoteData, getRemoteDataPayload } from '../../../../../core/shared/operators';
+import { hasValue, isNotEmpty } from '../../../../empty.util';
+import { Subscription } from 'rxjs';
+import { filter } from 'rxjs/operators';
+import { Relationship } from '../../../../../core/shared/item-relationships/relationship.model';
+import { MetadataValue } from '../../../../../core/shared/metadata.models';
+import { ItemMetadataRepresentation } from '../../../../../core/shared/metadata-representation/item/item-metadata-representation.model';
+import { RelationshipOptions } from '../../models/relationship-options.model';
+import { RemoveRelationshipAction } from '../relation-lookup-modal/relationship.actions';
+import { SelectableListService } from '../../../../object-list/selectable-list/selectable-list.service';
+import { Store } from '@ngrx/store';
+import { AppState } from '../../../../../app.reducer';
+import { ItemSearchResult } from '../../../../object-collection/shared/item-search-result.model';
+
+// tslint:disable:max-classes-per-file
+/**
+ * Abstract class that defines objects that can be reordered
+ */
+export abstract class Reorderable {
+  constructor(public oldIndex?: number, public newIndex?: number) {
+  }
+
+  abstract getId(): string;
+
+  abstract getPlace(): number;
+}
+
+/**
+ * Represents a single relationship that can be reordered in a list of multiple relationships
+ */
+export class ReorderableRelationship extends Reorderable {
+  relationship: Relationship;
+  useLeftItem: boolean;
+
+  constructor(relationship: Relationship, useLeftItem: boolean, oldIndex?: number, newIndex?: number) {
+    super(oldIndex, newIndex);
+    this.relationship = relationship;
+    this.useLeftItem = useLeftItem;
+  }
+
+  getId(): string {
+    return this.relationship.id;
+  }
+
+  getPlace(): number {
+    if (this.useLeftItem) {
+      return this.relationship.rightPlace
+    } else {
+      return this.relationship.leftPlace
+    }
+  }
+}
+
+/**
+ * Represents a single existing relationship value as metadata in submission
+ */
+@Component({
+  selector: 'ds-existing-metadata-list-element',
+  templateUrl: './existing-metadata-list-element.component.html',
+  styleUrls: ['./existing-metadata-list-element.component.scss']
+})
+export class ExistingMetadataListElementComponent implements OnChanges, OnDestroy {
+  @Input() listId: string;
+  @Input() submissionItem: Item;
+  @Input() reoRel: ReorderableRelationship;
+  @Input() metadataFields: string[];
+  @Input() relationshipOptions: RelationshipOptions;
+  metadataRepresentation: MetadataRepresentation;
+  relatedItem: Item;
+
+  /**
+   * List of subscriptions to unsubscribe from
+   */
+  private subs: Subscription[] = [];
+
+  constructor(
+    private selectableListService: SelectableListService,
+    private store: Store<AppState>
+  ) {
+  }
+
+  ngOnChanges() {
+    const item$ = this.reoRel.useLeftItem ?
+      this.reoRel.relationship.leftItem : this.reoRel.relationship.rightItem;
+    this.subs.push(item$.pipe(
+      getAllSucceededRemoteData(),
+      getRemoteDataPayload(),
+      filter((item: Item) => hasValue(item) && isNotEmpty(item.uuid))
+    ).subscribe((item: Item) => {
+      this.relatedItem = item;
+      const relationMD: MetadataValue = this.submissionItem.firstMetadata(this.relationshipOptions.metadataField, { value: this.relatedItem.uuid });
+      if (hasValue(relationMD)) {
+        const metadataRepresentationMD: MetadataValue = this.submissionItem.firstMetadata(this.metadataFields, { authority: relationMD.authority });
+        this.metadataRepresentation = Object.assign(
+          new ItemMetadataRepresentation(metadataRepresentationMD),
+          this.relatedItem
+        )
+      }
+    }));
+  }
+
+  /**
+   * Removes the selected relationship from the list
+   */
+  removeSelection() {
+    this.selectableListService.deselectSingle(this.listId, Object.assign(new ItemSearchResult(), { indexableObject: this.relatedItem }));
+    this.store.dispatch(new RemoveRelationshipAction(this.submissionItem, this.relatedItem, this.relationshipOptions.relationshipType))
+  }
+
+  /**
+   * Unsubscribe from all subscriptions
+   */
+  ngOnDestroy(): void {
+    this.subs
+      .filter((sub) => hasValue(sub))
+      .forEach((sub) => sub.unsubscribe());
+  }
+
+}
+// tslint:enable:max-classes-per-file

src/app/shared/form/builder/ds-dynamic-form-ui/models/disabled/dynamic-disabled.component.ts

@@ -11,6 +11,9 @@ import { DynamicDisabledModel } from './dynamic-disabled.model';
   selector: 'ds-dynamic-disabled',
   templateUrl: './dynamic-disabled.component.html'
 })
+/**
+ * Component for displaying a form input with a disabled property
+ */
 export class DsDynamicDisabledComponent extends DynamicFormControlComponent {
 
   @Input() formId: string;

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/dynamic-lookup-relation-modal.component.html

@@ -7,7 +7,7 @@
 </div>
 <div class="modal-body">
     <ngb-tabset>
-        <ngb-tab [title]="'submission.sections.describe.relationship-lookup.search-tab.tab-title.' + label | translate">
+        <ngb-tab [title]="'submission.sections.describe.relationship-lookup.search-tab.tab-title.' + label | translate  : {count: (totalInternal$ | async)}">
             <ng-template ngbTabContent>
                 <ds-dynamic-lookup-relation-search-tab
                         [selection$]="selection$"
@@ -21,6 +21,20 @@
                 </ds-dynamic-lookup-relation-search-tab>
             </ng-template>
         </ngb-tab>
+        <ngb-tab *ngFor="let source of (externalSourcesRD$ | async)?.payload?.page; let idx = index"
+                 [title]="'submission.sections.describe.relationship-lookup.search-tab.tab-title.' + source.id | translate  : {count: (totalExternal$ | async)[idx]}">
+            <ng-template ngbTabContent>
+                <ds-dynamic-lookup-relation-external-source-tab
+                        [listId]="listId"
+                        [repeatable]="repeatable"
+                        [context]="context"
+                        [externalSource]="source"
+                        (selectObject)="select($event)"
+                        (deselectObject)="deselect($event)"
+                        class="d-block pt-3">
+                </ds-dynamic-lookup-relation-external-source-tab>
+            </ng-template>
+        </ngb-tab>
         <ngb-tab [title]="'submission.sections.describe.relationship-lookup.selection-tab.tab-title' | translate : {count: (selection$ | async)?.length}">
             <ng-template ngbTabContent>
                 <ds-dynamic-lookup-relation-selection-tab

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/dynamic-lookup-relation-modal.component.spec.ts

@@ -13,6 +13,12 @@ import { Item } from '../../../../../core/shared/item.model';
 import { ItemSearchResult } from '../../../../object-collection/shared/item-search-result.model';
 import { RelationshipOptions } from '../../models/relationship-options.model';
 import { AddRelationshipAction, RemoveRelationshipAction } from './relationship.actions';
+import { SearchConfigurationService } from '../../../../../core/shared/search/search-configuration.service';
+import { PaginatedSearchOptions } from '../../../../search/paginated-search-options.model';
+import { ExternalSource } from '../../../../../core/shared/external-source.model';
+import { createPaginatedList, createSuccessfulRemoteDataObject$ } from '../../../../testing/utils';
+import { ExternalSourceService } from '../../../../../core/data/external-source.service';
+import { LookupRelationService } from '../../../../../core/data/lookup-relation.service';
 
 describe('DsDynamicLookupRelationModalComponent', () => {
   let component: DsDynamicLookupRelationModalComponent;
@@ -28,6 +34,24 @@ describe('DsDynamicLookupRelationModalComponent', () => {
   let relationship;
   let nameVariant;
   let metadataField;
+  let pSearchOptions;
+  let externalSourceService;
+  let lookupRelationService;
+
+  const externalSources = [
+    Object.assign(new ExternalSource(), {
+      id: 'orcidV2',
+      name: 'orcidV2',
+      hierarchical: false
+    }),
+    Object.assign(new ExternalSource(), {
+      id: 'sherpaPublisher',
+      name: 'sherpaPublisher',
+      hierarchical: false
+    })
+  ];
+  const totalLocal = 10;
+  const totalExternal = 8;
 
   function init() {
     item = Object.assign(new Item(), { uuid: '7680ca97-e2bd-4398-bfa7-139a8673dc42', metadata: {} });
@@ -41,6 +65,14 @@ describe('DsDynamicLookupRelationModalComponent', () => {
     relationship = { filter: 'filter', relationshipType: 'isAuthorOfPublication', nameVariants: true } as RelationshipOptions;
     nameVariant = 'Doe, J.';
     metadataField = 'dc.contributor.author';
+    pSearchOptions = new PaginatedSearchOptions({});
+    externalSourceService = jasmine.createSpyObj('externalSourceService', {
+      findAll: createSuccessfulRemoteDataObject$(createPaginatedList(externalSources))
+    });
+    lookupRelationService = jasmine.createSpyObj('lookupRelationService', {
+      getTotalLocalResults: observableOf(totalLocal),
+      getTotalExternalResults: observableOf(totalExternal)
+    });
   }
 
   beforeEach(async(() => {
@@ -49,6 +81,13 @@ describe('DsDynamicLookupRelationModalComponent', () => {
       declarations: [DsDynamicLookupRelationModalComponent],
       imports: [TranslateModule.forRoot(), RouterTestingModule.withRoutes([]), NgbModule.forRoot()],
       providers: [
+        {
+          provide: SearchConfigurationService, useValue: {
+            paginatedSearchOptions: observableOf(pSearchOptions)
+          }
+        },
+        { provide: ExternalSourceService, useValue: externalSourceService },
+        { provide: LookupRelationService, useValue: lookupRelationService },
         {
           provide: SelectableListService, useValue: selectableListService
         },

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/dynamic-lookup-relation-modal.component.ts

@@ -1,5 +1,5 @@
 import { Component, NgZone, OnDestroy, OnInit } from '@angular/core';
-import { combineLatest, Observable, Subscription } from 'rxjs';
+import { combineLatest, Observable, Subscription, zip as observableZip } from 'rxjs';
 import { NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';
 import { hasValue } from '../../../../empty.util';
 import { map, skip, switchMap, take } from 'rxjs/operators';
@@ -11,7 +11,11 @@ import { ListableObject } from '../../../../object-collection/shared/listable-ob
 import { RelationshipOptions } from '../../models/relationship-options.model';
 import { SearchResult } from '../../../../search/search-result.model';
 import { Item } from '../../../../../core/shared/item.model';
-import { getRemoteDataPayload, getSucceededRemoteData } from '../../../../../core/shared/operators';
+import {
+  getAllSucceededRemoteData,
+  getRemoteDataPayload,
+  getSucceededRemoteData
+} from '../../../../../core/shared/operators';
 import { AddRelationshipAction, RemoveRelationshipAction, UpdateRelationshipAction } from './relationship.actions';
 import { RelationshipService } from '../../../../../core/data/relationship.service';
 import { RelationshipTypeService } from '../../../../../core/data/relationship-type.service';
@@ -20,6 +24,11 @@ import { AppState } from '../../../../../app.reducer';
 import { Context } from '../../../../../core/shared/context.model';
 import { Relationship } from '../../../../../core/shared/item-relationships/relationship.model';
 import { MetadataValue } from '../../../../../core/shared/metadata.models';
+import { LookupRelationService } from '../../../../../core/data/lookup-relation.service';
+import { RemoteData } from '../../../../../core/data/remote-data';
+import { PaginatedList } from '../../../../../core/data/paginated-list';
+import { ExternalSource } from '../../../../../core/shared/external-source.model';
+import { ExternalSourceService } from '../../../../../core/data/external-source.service';
 
 @Component({
   selector: 'ds-dynamic-lookup-relation-modal',
@@ -37,23 +46,76 @@ import { MetadataValue } from '../../../../../core/shared/metadata.models';
  * Represents a modal where the submitter can select items to be added as a certain relationship type to the object being submitted
  */
 export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy {
+  /**
+   * The label to use to display i18n messages (describing the type of relationship)
+   */
   label: string;
+
+  /**
+   * Options for searching related items
+   */
   relationshipOptions: RelationshipOptions;
+
+  /**
+   * The ID of the list to add/remove selected items to/from
+   */
   listId: string;
+
+  /**
+   * The item we're adding relationships to
+   */
   item;
+
+  /**
+   * Is the selection repeatable?
+   */
   repeatable: boolean;
+
+  /**
+   * The list of selected items
+   */
   selection$: Observable<ListableObject[]>;
+
+  /**
+   * The context to display lists
+   */
   context: Context;
+
+  /**
+   * The metadata-fields describing these relationships
+   */
   metadataFields: string;
+
+  /**
+   * A map of subscriptions within this component
+   */
   subMap: {
     [uuid: string]: Subscription
   } = {};
 
+  /**
+   * A list of the available external sources configured for this relationship
+   */
+  externalSourcesRD$: Observable<RemoteData<PaginatedList<ExternalSource>>>;
+
+  /**
+   * The total amount of internal items for the current options
+   */
+  totalInternal$: Observable<number>;
+
+  /**
+   * The total amount of results for each external source using the current options
+   */
+  totalExternal$: Observable<number[]>;
+
   constructor(
     public modal: NgbActiveModal,
     private selectableListService: SelectableListService,
     private relationshipService: RelationshipService,
     private relationshipTypeService: RelationshipTypeService,
+    private externalSourceService: ExternalSourceService,
+    private lookupRelationService: LookupRelationService,
+    private searchConfigService: SearchConfigurationService,
     private zone: NgZone,
     private store: Store<AppState>
   ) {
@@ -70,13 +132,19 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
       this.context = Context.SubmissionModal;
     }
 
-    // this.setExistingNameVariants();
+    this.externalSourcesRD$ = this.externalSourceService.findAll();
+
+    this.setTotals();
   }
 
   close() {
     this.modal.close();
   }
 
+  /**
+   * Select (a list of) objects and add them to the store
+   * @param selectableObjects
+   */
   select(...selectableObjects: Array<SearchResult<Item>>) {
     this.zone.runOutsideAngular(
       () => {
@@ -104,6 +172,10 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
       });
   }
 
+  /**
+   * Add a subscription updating relationships with name variants
+   * @param sri The search result to track name variants for
+   */
   private addNameVariantSubscription(sri: SearchResult<Item>) {
     const nameVariant$ = this.relationshipService.getNameVariant(this.listId, sri.indexableObject.uuid);
     this.subMap[sri.indexableObject.uuid] = nameVariant$.pipe(
@@ -111,6 +183,10 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
     ).subscribe((nameVariant: string) => this.store.dispatch(new UpdateRelationshipAction(this.item, sri.indexableObject, this.relationshipOptions.relationshipType, nameVariant)))
   }
 
+  /**
+   * Deselect (a list of) objects and remove them from the store
+   * @param selectableObjects
+   */
   deselect(...selectableObjects: Array<SearchResult<Item>>) {
     this.zone.runOutsideAngular(
       () => selectableObjects.forEach((object) => {
@@ -120,6 +196,9 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
     );
   }
 
+  /**
+   * Set existing name variants for items by the item's virtual metadata
+   */
   private setExistingNameVariants() {
     const virtualMDs: MetadataValue[] = this.item.allMetadata(this.metadataFields).filter((mdValue) => mdValue.isVirtual);
 
@@ -154,6 +233,28 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
     )
   }
 
+  /**
+   * Calculate and set the total entries available for each tab
+   */
+  setTotals() {
+    this.totalInternal$ = this.searchConfigService.paginatedSearchOptions.pipe(
+      switchMap((options) => this.lookupRelationService.getTotalLocalResults(this.relationshipOptions, options))
+    );
+
+    const externalSourcesAndOptions$ = combineLatest(
+      this.externalSourcesRD$.pipe(
+        getAllSucceededRemoteData(),
+        getRemoteDataPayload()
+      ),
+      this.searchConfigService.paginatedSearchOptions
+    );
+
+    this.totalExternal$ = externalSourcesAndOptions$.pipe(
+      switchMap(([sources, options]) =>
+        observableZip(...sources.page.map((source: ExternalSource) => this.lookupRelationService.getTotalExternalResults(source, options))))
+    );
+  }
+
   ngOnDestroy() {
     Object.values(this.subMap).forEach((subscription) => subscription.unsubscribe());
   }

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.html

@@ -0,0 +1,31 @@
+<div class="row">
+  <div class="col-4">
+    <h3>{{ 'submission.sections.describe.relationship-lookup.selection-tab.settings' | translate}}</h3>
+    <ds-page-size-selector></ds-page-size-selector>
+  </div>
+  <div class="col-8">
+    <ds-search-form [query]="(searchConfigService.paginatedSearchOptions | async)?.query" [inPlaceSearch]="true"></ds-search-form>
+    <div>
+      <h3>{{ 'submission.sections.describe.relationship-lookup.selection-tab.title.' + externalSource.id | translate}}</h3>
+      <ng-container *ngVar="(entriesRD$ | async) as entriesRD">
+        <ds-viewable-collection *ngIf="entriesRD?.hasSucceeded && !entriesRD?.isLoading && entriesRD?.payload?.page?.length > 0" @fadeIn
+                                [objects]="entriesRD"
+                                [selectable]="true"
+                                [selectionConfig]="{ repeatable: repeatable, listId: listId }"
+                                [config]="initialPagination"
+                                [hideGear]="true"
+                                [context]="context"
+                                (deselectObject)="deselectObject.emit($event)"
+                                (selectObject)="selectObject.emit($event)">
+        </ds-viewable-collection>
+        <ds-loading *ngIf="!entriesRD || !entriesRD?.payload || entriesRD?.isLoading"
+                    message="{{'loading.search-results' | translate}}"></ds-loading>
+        <ds-error   *ngIf="entriesRD?.hasFailed && (!entriesRD?.error || entriesRD?.error?.statusCode != 400)"
+                    message="{{'error.search-results' | translate}}"></ds-error>
+        <div *ngIf="entriesRD?.payload?.page?.length == 0 || entriesRD?.error?.statusCode == 400" id="empty-external-entry-list">
+          {{ 'search.results.empty' | translate }}
+        </div>
+      </ng-container>
+    </div>
+  </div>
+</div>

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.spec.ts

@@ -0,0 +1,162 @@
+import { DsDynamicLookupRelationExternalSourceTabComponent } from './dynamic-lookup-relation-external-source-tab.component';
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { VarDirective } from '../../../../../utils/var.directive';
+import { TranslateModule } from '@ngx-translate/core';
+import { RouterTestingModule } from '@angular/router/testing';
+import { NO_ERRORS_SCHEMA } from '@angular/core';
+import { PaginatedSearchOptions } from '../../../../../search/paginated-search-options.model';
+import { SearchConfigurationService } from '../../../../../../core/shared/search/search-configuration.service';
+import { of as observableOf } from 'rxjs/internal/observable/of';
+import {
+  createFailedRemoteDataObject$,
+  createPaginatedList,
+  createPendingRemoteDataObject$,
+  createSuccessfulRemoteDataObject$
+} from '../../../../../testing/utils';
+import { ExternalSourceService } from '../../../../../../core/data/external-source.service';
+import { ExternalSource } from '../../../../../../core/shared/external-source.model';
+import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
+import { By } from '@angular/platform-browser';
+import { ExternalSourceEntry } from '../../../../../../core/shared/external-source-entry.model';
+
+describe('DsDynamicLookupRelationExternalSourceTabComponent', () => {
+  let component: DsDynamicLookupRelationExternalSourceTabComponent;
+  let fixture: ComponentFixture<DsDynamicLookupRelationExternalSourceTabComponent>;
+  let pSearchOptions;
+  let externalSourceService;
+
+  const externalSource = {
+    id: 'orcidV2',
+    name: 'orcidV2',
+    hierarchical: false
+  } as ExternalSource;
+  const externalEntries = [
+    Object.assign({
+      id: '0001-0001-0001-0001',
+      display: 'John Doe',
+      value: 'John, Doe',
+      metadata: {
+        'dc.identifier.uri': [
+          {
+            value: 'https://orcid.org/0001-0001-0001-0001'
+          }
+        ]
+      }
+    }),
+    Object.assign({
+      id: '0001-0001-0001-0002',
+      display: 'Sampson Megan',
+      value: 'Sampson, Megan',
+      metadata: {
+        'dc.identifier.uri': [
+          {
+            value: 'https://orcid.org/0001-0001-0001-0002'
+          }
+        ]
+      }
+    }),
+    Object.assign({
+      id: '0001-0001-0001-0003',
+      display: 'Edwards Anna',
+      value: 'Edwards, Anna',
+      metadata: {
+        'dc.identifier.uri': [
+          {
+            value: 'https://orcid.org/0001-0001-0001-0003'
+          }
+        ]
+      }
+    })
+  ] as ExternalSourceEntry[];
+
+  function init() {
+    pSearchOptions = new PaginatedSearchOptions({
+      query: 'test'
+    });
+    externalSourceService = jasmine.createSpyObj('externalSourceService', {
+      getExternalSourceEntries: createSuccessfulRemoteDataObject$(createPaginatedList(externalEntries))
+    });
+  }
+
+  beforeEach(async(() => {
+    init();
+    TestBed.configureTestingModule({
+      declarations: [DsDynamicLookupRelationExternalSourceTabComponent, VarDirective],
+      imports: [TranslateModule.forRoot(), RouterTestingModule.withRoutes([]), BrowserAnimationsModule],
+      providers: [
+        {
+          provide: SearchConfigurationService, useValue: {
+            paginatedSearchOptions: observableOf(pSearchOptions)
+          }
+        },
+        { provide: ExternalSourceService, useValue: externalSourceService }
+      ],
+      schemas: [NO_ERRORS_SCHEMA]
+    }).compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(DsDynamicLookupRelationExternalSourceTabComponent);
+    component = fixture.componentInstance;
+    component.externalSource = externalSource;
+    fixture.detectChanges();
+  });
+
+  describe('when the external entries finished loading successfully', () => {
+    it('should display a ds-viewable-collection component', () => {
+      const collection = fixture.debugElement.query(By.css('ds-viewable-collection'));
+      expect(collection).toBeDefined();
+    });
+  });
+
+  describe('when the external entries are loading', () => {
+    beforeEach(() => {
+      component.entriesRD$ = createPendingRemoteDataObject$(undefined);
+      fixture.detectChanges();
+    });
+
+    it('should not display a ds-viewable-collection component', () => {
+      const collection = fixture.debugElement.query(By.css('ds-viewable-collection'));
+      expect(collection).toBeNull();
+    });
+
+    it('should display a ds-loading component', () => {
+      const loading = fixture.debugElement.query(By.css('ds-loading'));
+      expect(loading).not.toBeNull();
+    });
+  });
+
+  describe('when the external entries failed loading', () => {
+    beforeEach(() => {
+      component.entriesRD$ = createFailedRemoteDataObject$(undefined);
+      fixture.detectChanges();
+    });
+
+    it('should not display a ds-viewable-collection component', () => {
+      const collection = fixture.debugElement.query(By.css('ds-viewable-collection'));
+      expect(collection).toBeNull();
+    });
+
+    it('should display a ds-error component', () => {
+      const error = fixture.debugElement.query(By.css('ds-error'));
+      expect(error).not.toBeNull();
+    });
+  });
+
+  describe('when the external entries return an empty list', () => {
+    beforeEach(() => {
+      component.entriesRD$ = createSuccessfulRemoteDataObject$(createPaginatedList([]));
+      fixture.detectChanges();
+    });
+
+    it('should not display a ds-viewable-collection component', () => {
+      const collection = fixture.debugElement.query(By.css('ds-viewable-collection'));
+      expect(collection).toBeNull();
+    });
+
+    it('should display a message the list is empty', () => {
+      const empty = fixture.debugElement.query(By.css('#empty-external-entry-list'));
+      expect(empty).not.toBeNull();
+    });
+  });
+});

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.ts

@@ -0,0 +1,96 @@
+import { Component, EventEmitter, Input, OnInit, Output } from '@angular/core';
+import { SEARCH_CONFIG_SERVICE } from '../../../../../../+my-dspace-page/my-dspace-page.component';
+import { SearchConfigurationService } from '../../../../../../core/shared/search/search-configuration.service';
+import { Router } from '@angular/router';
+import { ExternalSourceService } from '../../../../../../core/data/external-source.service';
+import { Observable } from 'rxjs/internal/Observable';
+import { RemoteData } from '../../../../../../core/data/remote-data';
+import { PaginatedList } from '../../../../../../core/data/paginated-list';
+import { ExternalSourceEntry } from '../../../../../../core/shared/external-source-entry.model';
+import { ExternalSource } from '../../../../../../core/shared/external-source.model';
+import { startWith, switchMap } from 'rxjs/operators';
+import { PaginatedSearchOptions } from '../../../../../search/paginated-search-options.model';
+import { Context } from '../../../../../../core/shared/context.model';
+import { ListableObject } from '../../../../../object-collection/shared/listable-object.model';
+import { fadeIn, fadeInOut } from '../../../../../animations/fade';
+import { PaginationComponentOptions } from '../../../../../pagination/pagination-component-options.model';
+
+@Component({
+  selector: 'ds-dynamic-lookup-relation-external-source-tab',
+  styleUrls: ['./dynamic-lookup-relation-external-source-tab.component.scss'],
+  templateUrl: './dynamic-lookup-relation-external-source-tab.component.html',
+  providers: [
+    {
+      provide: SEARCH_CONFIG_SERVICE,
+      useClass: SearchConfigurationService
+    }
+  ],
+  animations: [
+    fadeIn,
+    fadeInOut
+  ]
+})
+/**
+ * The tab displaying a list of importable entries for an external source
+ */
+export class DsDynamicLookupRelationExternalSourceTabComponent implements OnInit {
+  /**
+   * The label to use to display i18n messages (describing the type of relationship)
+   */
+  @Input() label: string;
+
+  /**
+   * The ID of the list to add/remove selected items to/from
+   */
+  @Input() listId: string;
+
+  /**
+   * Is the selection repeatable?
+   */
+  @Input() repeatable: boolean;
+
+  /**
+   * The context to display lists
+   */
+  @Input() context: Context;
+
+  /**
+   * Send an event to deselect an object from the list
+   */
+  @Output() deselectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();
+
+  /**
+   * Send an event to select an object from the list
+   */
+  @Output() selectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();
+
+  /**
+   * The initial pagination to start with
+   */
+  initialPagination = Object.assign(new PaginationComponentOptions(), {
+    id: 'submission-external-source-relation-list',
+    pageSize: 5
+  });
+
+  /**
+   * The external source we're selecting entries for
+   */
+  @Input() externalSource: ExternalSource;
+
+  /**
+   * The displayed list of entries
+   */
+  entriesRD$: Observable<RemoteData<PaginatedList<ExternalSourceEntry>>>;
+
+  constructor(private router: Router,
+              public searchConfigService: SearchConfigurationService,
+              private externalSourceService: ExternalSourceService) {
+  }
+
+  ngOnInit(): void {
+    this.entriesRD$ = this.searchConfigService.paginatedSearchOptions.pipe(
+      switchMap((searchOptions: PaginatedSearchOptions) =>
+        this.externalSourceService.getExternalSourceEntries(this.externalSource.id, searchOptions).pipe(startWith(undefined)))
+    )
+  }
+}

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/relationship.effects.ts

@@ -3,6 +3,7 @@ import { Actions, Effect, ofType } from '@ngrx/effects';
 import { debounceTime, map, mergeMap, take, tap } from 'rxjs/operators';
 import { BehaviorSubject } from 'rxjs';
 import { RelationshipService } from '../../../../../core/data/relationship.service';
+import { getSucceededRemoteData } from '../../../../../core/shared/operators';
 import { AddRelationshipAction, RelationshipAction, RelationshipActionTypes, RemoveRelationshipAction, UpdateRelationshipAction } from './relationship.actions';
 import { Item } from '../../../../../core/shared/item.model';
 import { hasNoValue, hasValue, hasValueOperator } from '../../../../empty.util';
@@ -88,7 +89,7 @@ export class RelationshipEffects {
             this.nameVariantUpdates[identifier] = nameVariant;
           } else {
             this.relationshipService.updateNameVariant(item1, item2, relationshipType, nameVariant)
-              .pipe()
+              .pipe(getSucceededRemoteData())
               .subscribe();
           }
         }

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/search-tab/dynamic-lookup-relation-search-tab.component.html

@@ -3,7 +3,7 @@
                        [resultCount]="(resultsRD$ | async)?.payload?.totalElements"
                        [inPlaceSearch]="true" [showViewModes]="false"></ds-search-sidebar>
     <div class="col-8">
-        <ds-search-form [inPlaceSearch]="true"></ds-search-form>
+        <ds-search-form [query]="(searchConfigService.paginatedSearchOptions | async)?.query" [inPlaceSearch]="true"></ds-search-form>
 
         <ds-search-labels [inPlaceSearch]="true"></ds-search-labels>
 
@@ -56,8 +56,8 @@
             </div>
         </div>
         <ds-search-results [searchResults]="(resultsRD$ | async)"
-                           [sortConfig]="this.searchConfig?.sort"
+                           [sortConfig]="this.lookupRelationService.searchConfig?.sort"
-                           [searchConfig]="this.searchConfig"
+                           [searchConfig]="this.lookupRelationService.searchConfig"
                            [selectable]="true"
                            [selectionConfig]="{ repeatable: repeatable, listId: listId }"
                            [linkType]="linkTypes.ExternalLink"

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/search-tab/dynamic-lookup-relation-search-tab.component.spec.ts

@@ -15,6 +15,8 @@ import { createSuccessfulRemoteDataObject$ } from '../../../../../testing/utils'
 import { PaginatedList } from '../../../../../../core/data/paginated-list';
 import { ItemSearchResult } from '../../../../../object-collection/shared/item-search-result.model';
 import { Item } from '../../../../../../core/shared/item.model';
+import { ActivatedRoute } from '@angular/router';
+import { LookupRelationService } from '../../../../../../core/data/lookup-relation.service';
 
 describe('DsDynamicLookupRelationSearchTabComponent', () => {
   let component: DsDynamicLookupRelationSearchTabComponent;
@@ -34,6 +36,7 @@ describe('DsDynamicLookupRelationSearchTabComponent', () => {
 
   let results;
   let selectableListService;
+  let lookupRelationService;
 
   function init() {
     relationship = { filter: 'filter', relationshipType: 'isAuthorOfPublication', nameVariants: true } as RelationshipOptions;
@@ -51,6 +54,10 @@ describe('DsDynamicLookupRelationSearchTabComponent', () => {
 
     results = new PaginatedList(undefined, [searchResult1, searchResult2, searchResult3]);
     selectableListService = jasmine.createSpyObj('selectableListService', ['deselect', 'select', 'deselectAll']);
+    lookupRelationService = jasmine.createSpyObj('lookupRelationService', {
+      getLocalResults: createSuccessfulRemoteDataObject$(results)
+    });
+    lookupRelationService.searchConfig = {};
   }
 
   beforeEach(async(() => {
@@ -75,6 +82,8 @@ describe('DsDynamicLookupRelationSearchTabComponent', () => {
             }
           }
         },
+        { provide: ActivatedRoute, useValue: { snapshot: { queryParams: {} } } },
+        { provide: LookupRelationService, useValue: lookupRelationService }
       ],
       schemas: [NO_ERRORS_SCHEMA]
     })

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/search-tab/dynamic-lookup-relation-search-tab.component.ts

@@ -11,14 +11,16 @@ import { RelationshipOptions } from '../../../models/relationship-options.model'
 import { PaginationComponentOptions } from '../../../../../pagination/pagination-component-options.model';
 import { ListableObject } from '../../../../../object-collection/shared/listable-object.model';
 import { SearchService } from '../../../../../../core/shared/search/search.service';
-import { Router } from '@angular/router';
+import { ActivatedRoute, Router } from '@angular/router';
 import { SelectableListService } from '../../../../../object-list/selectable-list/selectable-list.service';
 import { hasValue, isNotEmpty } from '../../../../../empty.util';
 import { concat, map, multicast, switchMap, take, takeWhile, tap } from 'rxjs/operators';
+import { DSpaceObject } from '../../../../../../core/shared/dspace-object.model';
 import { getSucceededRemoteData } from '../../../../../../core/shared/operators';
 import { RouteService } from '../../../../../../core/services/route.service';
 import { CollectionElementLinkType } from '../../../../../object-collection/collection-element-link.type';
 import { Context } from '../../../../../../core/shared/context.model';
+import { LookupRelationService } from '../../../../../../core/data/lookup-relation.service';
 
 @Component({
   selector: 'ds-dynamic-lookup-relation-search-tab',
@@ -36,32 +38,87 @@ import { Context } from '../../../../../../core/shared/context.model';
  * Tab for inside the lookup model that represents the items that can be used as a relationship in this submission
  */
 export class DsDynamicLookupRelationSearchTabComponent implements OnInit, OnDestroy {
+  /**
+   * Options for searching related items
+   */
   @Input() relationship: RelationshipOptions;
+
+  /**
+   * The ID of the list to add/remove selected items to/from
+   */
   @Input() listId: string;
+
+  /**
+   * Is the selection repeatable?
+   */
   @Input() repeatable: boolean;
+
+  /**
+   * The list of selected items
+   */
   @Input() selection$: Observable<ListableObject[]>;
+
+  /**
+   * The context to display lists
+   */
   @Input() context: Context;
 
+  /**
+   * Send an event to deselect an object from the list
+   */
   @Output() deselectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();
+
+  /**
+   * Send an event to select an object from the list
+   */
   @Output() selectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();
+
+  /**
+   * Search results
+   */
   resultsRD$: Observable<RemoteData<PaginatedList<SearchResult<Item>>>>;
-  searchConfig: PaginatedSearchOptions;
+
+  /**
+   * Are all results selected?
+   */
   allSelected: boolean;
+
+  /**
+   * Are some results selected?
+   */
   someSelected$: Observable<boolean>;
+
+  /**
+   * Is it currently loading to select all results?
+   */
   selectAllLoading: boolean;
+
+  /**
+   * Subscription to unsubscribe from
+   */
   subscription;
+
+  /**
+   * The initial pagination to use
+   */
   initialPagination = Object.assign(new PaginationComponentOptions(), {
     id: 'submission-relation-list',
     pageSize: 5
   });
+
+  /**
+   * The type of links to display
+   */
   linkTypes = CollectionElementLinkType;
 
   constructor(
     private searchService: SearchService,
     private router: Router,
+    private route: ActivatedRoute,
     private selectableListService: SelectableListService,
-    private searchConfigService: SearchConfigurationService,
+    public searchConfigService: SearchConfigurationService,
     private routeService: RouteService,
+    public lookupRelationService: LookupRelationService
   ) {
   }
 
@@ -75,24 +132,8 @@ export class DsDynamicLookupRelationSearchTabComponent implements OnInit, OnDest
 
     this.someSelected$ = this.selection$.pipe(map((selection) => isNotEmpty(selection)));
     this.resultsRD$ = this.searchConfigService.paginatedSearchOptions.pipe(
-      map((options) => {
+      switchMap((options) => this.lookupRelationService.getLocalResults(this.relationship, options))
-        return Object.assign(new PaginatedSearchOptions({}), options, { fixedFilter: this.relationship.filter, configuration: this.relationship.searchConfiguration })
+    );
-      }),
-      switchMap((options) => {
-        this.searchConfig = options;
-        return this.searchService.search(options).pipe(
-          /* Make sure to only listen to the first x results, until loading is finished */
-          /* TODO: in Rxjs 6.4.0 and up, we can replace this with takeWhile(predicate, true) - see https://stackoverflow.com/a/44644237 */
-          multicast(
-            () => new ReplaySubject(1),
-            (subject) => subject.pipe(
-              takeWhile((rd: RemoteData<PaginatedList<SearchResult<Item>>>) => rd.isLoading),
-              concat(subject.pipe(take(1)))
-            )
-          ) as any
-        )
-      })
-    ) as Observable<RemoteData<PaginatedList<SearchResult<Item>>>>;
   }
 
   /**
@@ -100,7 +141,7 @@ export class DsDynamicLookupRelationSearchTabComponent implements OnInit, OnDest
    */
   resetRoute() {
     this.router.navigate([], {
-      queryParams: Object.assign({}, { page: 1, pageSize: this.initialPagination.pageSize }),
+      queryParams: Object.assign({}, { pageSize: this.initialPagination.pageSize }, this.route.snapshot.queryParams, { page: 1 })
     });
   }
 
@@ -143,7 +184,7 @@ export class DsDynamicLookupRelationSearchTabComponent implements OnInit, OnDest
       currentPage: 1,
       pageSize: 9999
     });
-    const fullSearchConfig = Object.assign(this.searchConfig, { pagination: fullPagination });
+    const fullSearchConfig = Object.assign(this.lookupRelationService.searchConfig, { pagination: fullPagination });
     const results$ = this.searchService.search(fullSearchConfig) as Observable<RemoteData<PaginatedList<SearchResult<Item>>>>;
     results$.pipe(
       getSucceededRemoteData(),

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/selection-tab/dynamic-lookup-relation-selection-tab.component.spec.ts

@@ -73,11 +73,6 @@ describe('DsDynamicLookupRelationSelectionTabComponent', () => {
     expect(component).toBeTruthy();
   });
 
-  it('should call navigate on the router when is called resetRoute', () => {
-    component.resetRoute();
-    expect(router.navigate).toHaveBeenCalled();
-  });
-
   it('should call navigate on the router when is called resetRoute', () => {
     component.selectionRD$ = createSelection([]);
     fixture.detectChanges();

src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/selection-tab/dynamic-lookup-relation-selection-tab.component.ts

@@ -29,15 +29,49 @@ import { Context } from '../../../../../../core/shared/context.model';
  * Tab for inside the lookup model that represents the currently selected relationships
  */
 export class DsDynamicLookupRelationSelectionTabComponent {
+  /**
+   * The label to use to display i18n messages (describing the type of relationship)
+   */
   @Input() label: string;
+
+  /**
+   * The ID of the list to add/remove selected items to/from
+   */
   @Input() listId: string;
+
+  /**
+   * Is the selection repeatable?
+   */
   @Input() repeatable: boolean;
+
+  /**
+   * The list of selected items
+   */
   @Input() selection$: Observable<ListableObject[]>;
+
+  /**
+   * The paginated list of selected items
+   */
   @Input() selectionRD$: Observable<RemoteData<PaginatedList<ListableObject>>>;
+
+  /**
+   * The context to display lists
+   */
   @Input() context: Context;
+
+  /**
+   * Send an event to deselect an object from the list
+   */
   @Output() deselectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();
+
+  /**
+   * Send an event to select an object from the list
+   */
   @Output() selectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();
 
+  /**
+   * The initial pagination to use
+   */
   initialPagination = Object.assign(new PaginationComponentOptions(), {
     id: 'submission-relation-list',
     pageSize: 5
@@ -51,7 +85,6 @@ export class DsDynamicLookupRelationSelectionTabComponent {
    * Set up the selection and pagination on load
    */
   ngOnInit() {
-    this.resetRoute();
     this.selectionRD$ = this.searchConfigService.paginatedSearchOptions
       .pipe(
         map((options: PaginatedSearchOptions) => options.pagination),
@@ -75,13 +108,4 @@ export class DsDynamicLookupRelationSelectionTabComponent {
         })
       )
   }
-
-  /**
-   * Method to reset the route when the window is opened to make sure no strange pagination issues appears
-   */
-  resetRoute() {
-    this.router.navigate([], {
-      queryParams: Object.assign({}, { page: 1, pageSize: this.initialPagination.pageSize }),
-    });
-  }
 }

src/app/shared/pagination/pagination.component.ts

@@ -225,10 +225,14 @@ export class PaginationComponent implements OnDestroy, OnInit {
   }
 
   /**
+   * @param cdRef
+   *    ChangeDetectorRef is a singleton service provided by Angular.
    * @param route
    *    Route is a singleton service provided by Angular.
    * @param router
    *    Router is a singleton service provided by Angular.
+   * @param hostWindowService
+   *    the HostWindowService singleton.
    */
   constructor(private cdRef: ChangeDetectorRef,
               private route: ActivatedRoute,
@@ -243,7 +247,7 @@ export class PaginationComponent implements OnDestroy, OnInit {
    *    The page being navigated to.
    */
   public doPageChange(page: number) {
-    this.updateRoute({ page: page.toString() });
+    this.updateRoute({ pageId: this.id, page: page.toString() });
   }
 
   /**
@@ -253,7 +257,7 @@ export class PaginationComponent implements OnDestroy, OnInit {
    *    The page size being navigated to.
    */
   public doPageSizeChange(pageSize: number) {
-    this.updateRoute({ page: 1, pageSize: pageSize });
+    this.updateRoute({ pageId: this.id, page: 1, pageSize: pageSize });
   }
 
   /**
@@ -263,7 +267,7 @@ export class PaginationComponent implements OnDestroy, OnInit {
    *    The sort direction being navigated to.
    */
   public doSortDirectionChange(sortDirection: SortDirection) {
-    this.updateRoute({ page: 1, sortDirection: sortDirection });
+    this.updateRoute({ pageId: this.id, page: 1, sortDirection: sortDirection });
   }
 
   /**
@@ -273,7 +277,7 @@ export class PaginationComponent implements OnDestroy, OnInit {
    *    The sort field being navigated to.
    */
   public doSortFieldChange(field: string) {
-    this.updateRoute({ page: 1, sortField: field });
+    this.updateRoute({ pageId: this.id, page: 1, sortField: field });
   }
 
   /**
@@ -413,6 +417,8 @@ export class PaginationComponent implements OnDestroy, OnInit {
    * Method to update all pagination variables to the current query parameters
    */
   private setFields() {
+    // set fields only when page id is the one configured for this pagination instance
+    if (this.currentQueryParams.pageId === this.id) {
       // (+) converts string to a number
       const page = this.currentQueryParams.page;
       if (this.currentPage !== +page) {
@@ -435,6 +441,7 @@ export class PaginationComponent implements OnDestroy, OnInit {
       }
       this.cdRef.detectChanges();
     }
+  }
 
   /**
    * Method to validate the current page value

src/app/shared/search/search-filters/search-filter/search-facet-filter/search-facet-filter.component.ts

@@ -24,6 +24,7 @@ import { getSucceededRemoteData } from '../../../../../core/shared/operators';
 import { InputSuggestion } from '../../../../input-suggestions/input-suggestions.model';
 import { SearchOptions } from '../../../search-options.model';
 import { SEARCH_CONFIG_SERVICE } from '../../../../../+my-dspace-page/my-dspace-page.component';
+import { currentPath } from '../../../../utils/route.utils';
 
 @Component({
   selector: 'ds-search-facet-filter',
@@ -185,7 +186,7 @@ export class SearchFacetFilterComponent implements OnInit, OnDestroy {
    */
   public getSearchLink(): string {
     if (this.inPlaceSearch) {
-      return '';
+      return currentPath(this.router);
     }
     return this.searchService.getSearchLink();
   }

src/app/shared/shared.module.ts

@@ -48,10 +48,7 @@ import { LogOutComponent } from './log-out/log-out.component';
 import { FormComponent } from './form/form.component';
 import { DsDynamicTypeaheadComponent } from './form/builder/ds-dynamic-form-ui/models/typeahead/dynamic-typeahead.component';
 import { DsDynamicScrollableDropdownComponent } from './form/builder/ds-dynamic-form-ui/models/scrollable-dropdown/dynamic-scrollable-dropdown.component';
-import {
+import { DsDynamicFormControlContainerComponent, dsDynamicFormControlMapFn } from './form/builder/ds-dynamic-form-ui/ds-dynamic-form-control-container.component';
-  DsDynamicFormControlContainerComponent,
-  dsDynamicFormControlMapFn
-} from './form/builder/ds-dynamic-form-ui/ds-dynamic-form-control-container.component';
 import { DsDynamicFormComponent } from './form/builder/ds-dynamic-form-ui/ds-dynamic-form.component';
 import { DYNAMIC_FORM_CONTROL_MAP_FN, DynamicFormsCoreModule } from '@ng-dynamic-forms/core';
 import { DynamicFormsNGBootstrapUIModule } from '@ng-dynamic-forms/ui-ng-bootstrap';
@@ -174,8 +171,10 @@ import { PageWithSidebarComponent } from './sidebar/page-with-sidebar.component'
 import { SidebarDropdownComponent } from './sidebar/sidebar-dropdown.component';
 import { SidebarFilterComponent } from './sidebar/filter/sidebar-filter.component';
 import { SidebarFilterSelectedOptionComponent } from './sidebar/filter/sidebar-filter-selected-option.component';
-import { MetadataRepresentationListComponent } from '../+item-page/simple/metadata-representation-list/metadata-representation-list.component';
 import { SelectableListItemControlComponent } from './object-collection/shared/selectable-list-item-control/selectable-list-item-control.component';
+import { DsDynamicLookupRelationExternalSourceTabComponent } from './form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component';
+import { DragDropModule } from '@angular/cdk/drag-drop';
+import { ExistingMetadataListElementComponent } from './form/builder/ds-dynamic-form-ui/existing-metadata-list-element/existing-metadata-list-element.component';
 
 const MODULES = [
   // Do NOT include UniversalModule, HttpModule, or JsonpModule here
@@ -198,6 +197,7 @@ const MODULES = [
   MomentModule,
   TextMaskModule,
   MenuModule,
+  DragDropModule
 ];
 
 const ROOT_MODULES = [
@@ -334,7 +334,8 @@ const COMPONENTS = [
   ItemSelectComponent,
   CollectionSelectComponent,
   MetadataRepresentationLoaderComponent,
-  SelectableListItemControlComponent
+  SelectableListItemControlComponent,
+  ExistingMetadataListElementComponent
 ];
 
 const ENTRY_COMPONENTS = [
@@ -395,7 +396,8 @@ const ENTRY_COMPONENTS = [
   SearchFacetRangeOptionComponent,
   SearchAuthorityFilterComponent,
   DsDynamicLookupRelationSearchTabComponent,
-  DsDynamicLookupRelationSelectionTabComponent
+  DsDynamicLookupRelationSelectionTabComponent,
+  DsDynamicLookupRelationExternalSourceTabComponent
 ];
 
 const SHARED_ITEM_PAGE_COMPONENTS = [
@@ -437,7 +439,8 @@ const DIRECTIVES = [
     ...DIRECTIVES,
     ...ENTRY_COMPONENTS,
     ...SHARED_ITEM_PAGE_COMPONENTS,
-    PublicationSearchResultListElementComponent
+    PublicationSearchResultListElementComponent,
+    ExistingMetadataListElementComponent
   ],
   providers: [
     ...PROVIDERS

src/app/shared/sidebar/page-with-sidebar.component.spec.ts

@@ -70,6 +70,5 @@ describe('PageWithSidebarComponent', () => {
     it('should open the menu', () => {
       expect(menu.classList).toContain('active');
     });
-
   });
 });

src/app/submission/form/collection/submission-form-collection.component.ts

@@ -1,8 +1,28 @@
-import { ChangeDetectorRef, Component, EventEmitter, HostListener, Input, OnChanges, OnInit, Output, SimpleChanges } from '@angular/core';
+import {
+  ChangeDetectorRef,
+  Component,
+  EventEmitter,
+  HostListener,
+  Input,
+  OnChanges,
+  OnInit,
+  Output,
+  SimpleChanges
+} from '@angular/core';
 import { FormControl } from '@angular/forms';
 
 import { BehaviorSubject, combineLatest, Observable, of as observableOf, Subscription } from 'rxjs';
-import { debounceTime, distinctUntilChanged, filter, map, mergeMap, reduce, startWith, flatMap, find } from 'rxjs/operators';
+import {
+  debounceTime,
+  distinctUntilChanged,
+  filter,
+  find,
+  flatMap,
+  map,
+  mergeMap,
+  reduce,
+  startWith
+} from 'rxjs/operators';
 
 import { Collection } from '../../../core/shared/collection.model';
 import { CommunityDataService } from '../../../core/data/community-data.service';
@@ -227,8 +247,7 @@ export class SubmissionFormCollectionComponent implements OnChanges, OnInit {
             } else {
               return listCollection.filter((v) => v.collection.name.toLowerCase().indexOf(searchTerm.toLowerCase()) > -1).slice(0, 5);
             }
-        })
+          }));
-      );
       }
     }
   }

tslint.json

@@ -113,6 +113,13 @@
         "parameter": "nospace",
         "property-declaration": "nospace",
         "variable-declaration": "nospace"
+      },
+      {
+        "call-signature": "onespace",
+        "index-signature": "onespace",
+        "parameter": "onespace",
+        "property-declaration": "onespace",
+        "variable-declaration": "onespace"
       }
     ],
     "unified-signatures": true,