refactor done, todo fix tests

2025-10-07 18:14:17 +00:00 · 2017-10-25 13:31:10 +02:00
parent 376686856b
commit feca366290
48 changed files with 691 additions and 706 deletions
--- a/resources/i18n/en.json
+++ b/resources/i18n/en.json
@@ -91,7 +91,8 @@
    "sub-collections": "Loading sub-collections...",
    "items": "Loading items...",
    "item": "Loading item...",
-    "objects": "Loading..."
+    "objects": "Loading...",
+    "search-results": "Loading search results..."
  },
  "error": {
    "default": "Error",
@@ -101,6 +102,7 @@
    "sub-collections": "Error fetching sub-collections",
    "items": "Error fetching items",
    "item": "Error fetching item",
-    "objects": "Error fetching objects"
+    "objects": "Error fetching objects",
+    "search-results": "Error fetching search results"
  }
 }
--- a/src/app/+collection-page/collection-page.component.html
+++ b/src/app/+collection-page/collection-page.component.html
@@ -1,13 +1,13 @@
 <div class="collection-page">
-  <div *ngIf="collectionData.hasSucceeded | async" @fadeInOut>
-    <div *ngIf="collectionData.payload | async; let collectionPayload">
+  <div *ngIf="(collectionData | async)?.hasSucceeded" @fadeInOut>
+    <div *ngIf="(collectionData | async)?.payload; let collectionPayload">
      <!-- Collection Name -->
      <ds-comcol-page-header
        [name]="collectionPayload.name">
      </ds-comcol-page-header>
      <!-- Collection logo -->
      <ds-comcol-page-logo *ngIf="logoData"
-        [logo]="logoData.payload | async"
+        [logo]="(logoData | async)?.payload"
        [alternateText]="'Collection Logo'">
      </ds-comcol-page-logo>
      <!-- Introductionary text -->
@@ -33,18 +33,19 @@
      </ds-comcol-page-content>
    </div>
  </div>
-  <ds-error *ngIf="collectionData.hasFailed | async" message="{{'error.collection' | translate}}"></ds-error>
-  <ds-loading *ngIf="collectionData.isLoading | async" message="{{'loading.collection' | translate}}"></ds-loading>
+  <ds-error *ngIf="(collectionData | async)?.hasFailed" message="{{'error.collection' | translate}}"></ds-error>
+  <ds-loading *ngIf="(collectionData | async)?.isLoading" message="{{'loading.collection' | translate}}"></ds-loading>
  <br>
-  <div *ngIf="itemData.hasSucceeded | async" @fadeIn>
+  <div *ngIf="itemData?.hasSucceeded" @fadeIn>
    <h2>{{'collection.page.browse.recent.head' | translate}}</h2>
    <ds-object-list
      [config]="paginationConfig"
      [sortConfig]="sortConfig"
      [objects]="itemData"
-      [hideGear]="false">
+      [hideGear]="false"
+      (paginationChange)="onPaginationChange($event)">
    </ds-object-list>
  </div>
-  <ds-error *ngIf="itemData.hasFailed | async" message="{{'error.items' | translate}}"></ds-error>
-  <ds-loading *ngIf="itemData.isLoading | async" message="{{'loading.items' | translate}}"></ds-loading>
+  <ds-error *ngIf="itemData?.hasFailed" message="{{'error.items' | translate}}"></ds-error>
+  <ds-loading *ngIf="itemData?.isLoading" message="{{'loading.items' | translate}}"></ds-loading>
 </div>
--- a/src/app/+collection-page/collection-page.component.ts
+++ b/src/app/+collection-page/collection-page.component.ts
@@ -7,13 +7,13 @@ import { SortOptions } from '../core/cache/models/sort-options.model';
 import { CollectionDataService } from '../core/data/collection-data.service';
 import { ItemDataService } from '../core/data/item-data.service';
 import { RemoteData } from '../core/data/remote-data';
+
+import { MetadataService } from '../core/metadata/metadata.service';
 import { Bitstream } from '../core/shared/bitstream.model';

 import { Collection } from '../core/shared/collection.model';
 import { Item } from '../core/shared/item.model';

-import { MetadataService } from '../core/metadata/metadata.service';
-
 import { fadeIn, fadeInOut } from '../shared/animations/fade';
 import { hasValue, isNotEmpty } from '../shared/empty.util';
 import { PaginationComponentOptions } from '../shared/pagination/pagination-component-options.model';
@@ -29,9 +29,9 @@ import { PaginationComponentOptions } from '../shared/pagination/pagination-comp
  ]
 })
 export class CollectionPageComponent implements OnInit, OnDestroy {
-  collectionData: RemoteData<Collection>;
+  collectionData: Observable<RemoteData<Collection>>;
  itemData: RemoteData<Item[]>;
-  logoData: RemoteData<Bitstream>;
+  logoData: Observable<RemoteData<Bitstream>>;
  paginationConfig: PaginationComponentOptions;
  sortConfig: SortOptions;
  private subs: Subscription[] = [];
@@ -62,7 +62,10 @@ export class CollectionPageComponent implements OnInit, OnDestroy {
          this.collectionId = params.id;
          this.collectionData = this.collectionDataService.findById(this.collectionId);
          this.metadata.processRemoteData(this.collectionData);
-          this.subs.push(this.collectionData.payload.subscribe((collection) => this.logoData = collection.logo));
+          this.subs.push(this.collectionData
+            .map((rd: RemoteData<Collection>) => rd.payload)
+            .filter((collection: Collection) => hasValue(collection))
+            .subscribe((collection: Collection) => this.logoData = collection.logo));

          const page = +params.page || this.paginationConfig.currentPage;
          const pageSize = +params.pageSize || this.paginationConfig.pageSize;
@@ -84,12 +87,14 @@ export class CollectionPageComponent implements OnInit, OnDestroy {
  }

  updatePage(searchOptions) {
-    this.itemData = this.itemDataService.findAll({
+    this.subs.push(this.itemDataService.findAll({
      scopeID: this.collectionId,
      currentPage: searchOptions.pagination.currentPage,
      elementsPerPage: searchOptions.pagination.pageSize,
      sort: searchOptions.sort
-    });
+    }).subscribe((rd: RemoteData<Item[]>) => {
+      this.itemData = rd;
+    }));
  }

  ngOnDestroy(): void {
@@ -99,4 +104,17 @@ export class CollectionPageComponent implements OnInit, OnDestroy {
  isNotEmpty(object: any) {
    return isNotEmpty(object);
  }
+
+  onPaginationChange(event) {
+    this.updatePage({
+      pagination: {
+        currentPage: event.page,
+        pageSize: event.pageSize
+      },
+      sort: {
+        field: event.sortField,
+        direction: event.sortDirection
+      }
+    })
+  }
 }
--- a/src/app/+community-page/community-page.component.html
+++ b/src/app/+community-page/community-page.component.html
@@ -1,10 +1,10 @@
-<div class="community-page" *ngIf="communityData.hasSucceeded | async" @fadeInOut>
-  <div *ngIf="communityData.payload | async; let communityPayload">
+<div class="community-page" *ngIf="(communityData | async)?.hasSucceeded" @fadeInOut>
+  <div *ngIf="(communityData | async)?.payload; let communityPayload">
    <!-- Community name -->
    <ds-comcol-page-header [name]="communityPayload.name"></ds-comcol-page-header>
    <!-- Community logo -->
    <ds-comcol-page-logo *ngIf="logoData"
-      [logo]="logoData.payload | async"
+      [logo]="(logoData | async)?.payload"
      [alternateText]="'Community Logo'">
    </ds-comcol-page-logo>
    <!-- Introductionary text -->
@@ -26,5 +26,5 @@
    <ds-community-page-sub-collection-list></ds-community-page-sub-collection-list>
  </div>
 </div>
-<ds-error *ngIf="communityData.hasFailed | async" message="{{'error.community' | translate}}"></ds-error>
-<ds-loading *ngIf="communityData.isLoading | async" message="{{'loading.community' | translate}}"></ds-loading>
+<ds-error *ngIf="(communityData | async)?.hasFailed" message="{{'error.community' | translate}}"></ds-error>
+<ds-loading *ngIf="(communityData | async)?.isLoading" message="{{'loading.community' | translate}}"></ds-loading>
--- a/src/app/+community-page/community-page.component.ts
+++ b/src/app/+community-page/community-page.component.ts
@@ -12,6 +12,7 @@ import { MetadataService } from '../core/metadata/metadata.service';

 import { fadeInOut } from '../shared/animations/fade';
 import { hasValue } from '../shared/empty.util';
+import { Observable } from 'rxjs/Observable';

@Component({
  selector: 'ds-community-page',
@@ -21,8 +22,8 @@ import { hasValue } from '../shared/empty.util';
  animations: [fadeInOut]
 })
 export class CommunityPageComponent implements OnInit, OnDestroy {
-  communityData: RemoteData<Community>;
-  logoData: RemoteData<Bitstream>;
+  communityData: Observable<RemoteData<Community>>;
+  logoData: Observable<RemoteData<Bitstream>>;
  private subs: Subscription[] = [];

  constructor(
@@ -37,7 +38,10 @@ export class CommunityPageComponent implements OnInit, OnDestroy {
    this.route.params.subscribe((params: Params) => {
      this.communityData = this.communityDataService.findById(params.id);
      this.metadata.processRemoteData(this.communityData);
-      this.subs.push(this.communityData.payload.subscribe((community) => this.logoData = community.logo));
+      this.subs.push(this.communityData
+        .map((rd: RemoteData<Community>) => rd.payload)
+        .filter((community: Community) => hasValue(community))
+        .subscribe((community: Community) => this.logoData = community.logo));
    });
  }

--- a/src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.html
+++ b/src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.html
@@ -1,7 +1,7 @@
-<div *ngIf="subCollections.hasSucceeded | async" @fadeIn>
+<div *ngIf="(subCollections | async)?.hasSucceeded" @fadeIn>
  <h2>{{'community.sub-collection-list.head' | translate}}</h2>
  <ul>
-    <li *ngFor="let collection of (subCollections.payload | async)">
+    <li *ngFor="let collection of (subCollections | async)?.payload">
      <p>
        <span class="lead"><a [routerLink]="['/collections', collection.id]">{{collection.name}}</a></span><br>
        <span class="text-muted">{{collection.shortDescription}}</span>
@@ -9,5 +9,5 @@
    </li>
  </ul>
 </div>
-<ds-error *ngIf="subCollections.hasFailed | async" message="{{'error.sub-collections' | translate}}"></ds-error>
-<ds-loading *ngIf="subCollections.isLoading | async" message="{{'loading.sub-collections' | translate}}"></ds-loading>
+<ds-error *ngIf="(subCollections | async)?.hasFailed" message="{{'error.sub-collections' | translate}}"></ds-error>
+<ds-loading *ngIf="(subCollections | async)?.isLoading" message="{{'loading.sub-collections' | translate}}"></ds-loading>
--- a/src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.ts
+++ b/src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.ts
@@ -5,6 +5,7 @@ import { RemoteData } from '../../core/data/remote-data';
 import { Collection } from '../../core/shared/collection.model';

 import { fadeIn } from '../../shared/animations/fade';
+import { Observable } from 'rxjs/Observable';

@Component({
  selector: 'ds-community-page-sub-collection-list',
@@ -13,7 +14,7 @@ import { fadeIn } from '../../shared/animations/fade';
  animations:[fadeIn]
 })
 export class CommunityPageSubCollectionListComponent implements OnInit {
-  subCollections: RemoteData<Collection[]>;
+  subCollections: Observable<RemoteData<Collection[]>>;

  constructor(private cds: CollectionDataService) {

--- a/src/app/+home-page/top-level-community-list/top-level-community-list.component.html
+++ b/src/app/+home-page/top-level-community-list/top-level-community-list.component.html
@@ -1,13 +1,13 @@
-<div *ngIf="topLevelCommunities.hasSucceeded | async" @fadeInOut>
+<div *ngIf="(topLevelCommunities | async)?.hasSucceeded" @fadeInOut>
  <h2>{{'home.top-level-communities.head' | translate}}</h2>
  <p class="lead">{{'home.top-level-communities.help' | translate}}</p>
  <ds-object-list
    [config]="config"
    [sortConfig]="sortConfig"
-    [objects]="topLevelCommunities"
+    [objects]="topLevelCommunities | async"
    [hideGear]="true"
    (paginationChange)="updatePage($event)">
  </ds-object-list>
 </div>
-<ds-error *ngIf="topLevelCommunities.hasFailed | async" message="{{'error.top-level-communites' | translate}}"></ds-error>
-<ds-loading *ngIf="topLevelCommunities.isLoading | async" message="{{'loading.top-level-communities' | translate}}"></ds-loading>
+<ds-error *ngIf="(topLevelCommunities | async)?.hasFailed" message="{{'error.top-level-communites' | translate}}"></ds-error>
+<ds-loading *ngIf="(topLevelCommunities | async)?.isLoading" message="{{'loading.top-level-communities' | translate}}"></ds-loading>
--- a/src/app/+home-page/top-level-community-list/top-level-community-list.component.ts
+++ b/src/app/+home-page/top-level-community-list/top-level-community-list.component.ts
@@ -1,4 +1,5 @@
 import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { Observable } from 'rxjs/Observable';
 import { SortOptions } from '../../core/cache/models/sort-options.model';
 import { CommunityDataService } from '../../core/data/community-data.service';

@@ -16,7 +17,7 @@ import { PaginationComponentOptions } from '../../shared/pagination/pagination-c
  animations: [fadeInOut]
 })
 export class TopLevelCommunityListComponent {
-  topLevelCommunities: RemoteData<Community[]>;
+  topLevelCommunities: Observable<RemoteData<Community[]>>;
  config: PaginationComponentOptions;
  sortConfig: SortOptions;

--- a/src/app/+item-page/field-components/collections/collections.component.ts
+++ b/src/app/+item-page/field-components/collections/collections.component.ts
@@ -4,6 +4,7 @@ import { Observable } from 'rxjs/Observable';
 import { Collection } from '../../../core/shared/collection.model';
 import { Item } from '../../../core/shared/item.model';
 import { RemoteDataBuildService } from '../../../core/cache/builders/remote-data-build.service';
+import { RemoteData } from '../../../core/data/remote-data';

 /**
 * This component renders the parent collections section of the item
@@ -34,7 +35,7 @@ export class CollectionsComponent implements OnInit {
    // TODO: this should use parents, but the collections
    // for an Item aren't returned by the REST API yet,
    // only the owning collection
-    this.collections = this.item.owner.payload.map((c) => [c]);
+    this.collections = this.item.owner.map((rd: RemoteData<Collection>) => [rd.payload]);
  }

 }
--- a/src/app/+item-page/full/full-item-page.component.html
+++ b/src/app/+item-page/full/full-item-page.component.html
@@ -1,5 +1,5 @@
-<div class="item-page" *ngIf="item.hasSucceeded | async" @fadeInOut>
-  <div *ngIf="item.payload | async; let itemPayload">
+<div class="item-page" *ngIf="(item | async)?.hasSucceeded" @fadeInOut>
+  <div *ngIf="(item | async)?.payload; let itemPayload">
    <ds-item-page-title-field [item]="itemPayload"></ds-item-page-title-field>
    <div class="simple-view-link">
      <a class="btn btn-outline-primary col-4" [routerLink]="['/items/' + itemPayload.id]">
@@ -19,5 +19,5 @@
    <ds-item-page-collections [item]="itemPayload"></ds-item-page-collections>
  </div>
 </div>
-<ds-error *ngIf="item.hasFailed | async" message="{{'error.item' | translate}}"></ds-error>
-<ds-loading *ngIf="item.isLoading | async" message="{{'loading.item' | translate}}"></ds-loading>
+<ds-error *ngIf="(item | async)?.hasFailed" message="{{'error.item' | translate}}"></ds-error>
+<ds-loading *ngIf="(item | async)?.isLoading" message="{{'loading.item' | translate}}"></ds-loading>
--- a/src/app/+item-page/full/full-item-page.component.ts
+++ b/src/app/+item-page/full/full-item-page.component.ts
@@ -1,4 +1,4 @@
-import { Component, OnInit } from '@angular/core';
+import { ChangeDetectionStrategy, Component, OnInit } from '@angular/core';
 import { ActivatedRoute } from '@angular/router';

 import { Observable } from 'rxjs/Observable';
@@ -13,6 +13,7 @@ import { Item } from '../../core/shared/item.model';
 import { MetadataService } from '../../core/metadata/metadata.service';

 import { fadeInOut } from '../../shared/animations/fade';
+import { hasValue } from '../../shared/empty.util';

 /**
 * This component renders a simple item page.
@@ -24,11 +25,12 @@ import { fadeInOut } from '../../shared/animations/fade';
  selector: 'ds-full-item-page',
  styleUrls: ['./full-item-page.component.scss'],
  templateUrl: './full-item-page.component.html',
+  changeDetection: ChangeDetectionStrategy.OnPush,
  animations: [fadeInOut]
 })
 export class FullItemPageComponent extends ItemPageComponent implements OnInit {

-  item: RemoteData<Item>;
+  item: Observable<RemoteData<Item>>;

  metadata: Observable<Metadatum[]>;

@@ -43,7 +45,10 @@ export class FullItemPageComponent extends ItemPageComponent implements OnInit {

  initialize(params) {
    super.initialize(params);
-    this.metadata = this.item.payload.map((i) => i.metadata);
+    this.metadata = this.item
+      .map((rd: RemoteData<Item>) => rd.payload)
+      .filter((item: Item) => hasValue(item))
+      .map((item: Item) => item.metadata);
  }

 }
--- a/src/app/+item-page/simple/item-page.component.html
+++ b/src/app/+item-page/simple/item-page.component.html
@@ -1,5 +1,5 @@
-<div class="item-page" *ngIf="item.hasSucceeded | async" @fadeInOut>
-  <div *ngIf="item.payload | async; let itemPayload">
+<div class="item-page" *ngIf="(item | async)?.hasSucceeded" @fadeInOut>
+  <div *ngIf="(item | async)?.payload; let itemPayload">
    <ds-item-page-title-field [item]="itemPayload"></ds-item-page-title-field>
    <div class="row">
      <div class="col-xs-12 col-md-4">
@@ -23,5 +23,5 @@
    </div>
  </div>
 </div>
-<ds-error *ngIf="item.hasFailed | async" message="{{'error.item' | translate}}"></ds-error>
-<ds-loading *ngIf="item.isLoading | async" message="{{'loading.item' | translate}}"></ds-loading>
+<ds-error *ngIf="(item | async)?.hasFailed" message="{{'error.item' | translate}}"></ds-error>
+<ds-loading *ngIf="(item | async)?.isLoading" message="{{'loading.item' | translate}}"></ds-loading>
--- a/src/app/+item-page/simple/item-page.component.ts
+++ b/src/app/+item-page/simple/item-page.component.ts
@@ -11,6 +11,7 @@ import { Item } from '../../core/shared/item.model';
 import { MetadataService } from '../../core/metadata/metadata.service';

 import { fadeInOut } from '../../shared/animations/fade';
+import { hasValue } from '../../shared/empty.util';

 /**
 * This component renders a simple item page.
@@ -30,7 +31,7 @@ export class ItemPageComponent implements OnInit {

  private sub: any;

-  item: RemoteData<Item>;
+  item: Observable<RemoteData<Item>>;

  thumbnail: Observable<Bitstream>;

@@ -52,7 +53,10 @@ export class ItemPageComponent implements OnInit {
    this.id = +params.id;
    this.item = this.items.findById(params.id);
    this.metadataService.processRemoteData(this.item);
-    this.thumbnail = this.item.payload.flatMap((i) => i.getThumbnail());
+    this.thumbnail = this.item
+      .map((rd: RemoteData<Item>) => rd.payload)
+      .filter((item: Item) => hasValue(item))
+      .flatMap((item: Item) => item.getThumbnail());
  }

 }
--- a/src/app/+search-page/search-page.component.html
+++ b/src/app/+search-page/search-page.component.html
@@ -1,9 +1,9 @@
 <div class="search-page">
    <ds-search-form
      [query]="query"
-      [scope]="scopeObject?.payload | async"
+      [scope]="(scopeObject | async)?.payload"
      [currentParams]="currentParams"
-      [scopes]="scopeList?.payload">
+      [scopes]="(scopeList | async)?.payload">
    </ds-search-form>
-    <ds-search-results [searchResults]="results" [searchConfig]="searchOptions"></ds-search-results>
+    <ds-search-results [searchResults]="results | async" [searchConfig]="searchOptions"></ds-search-results>
 </div>
--- a/src/app/+search-page/search-page.component.spec.ts
+++ b/src/app/+search-page/search-page.component.spec.ts
@@ -9,7 +9,7 @@ import { Community } from '../core/shared/community.model';
 import { PaginationComponentOptions } from '../shared/pagination/pagination-component-options.model';
 import { SortDirection, SortOptions } from '../core/cache/models/sort-options.model';

-describe('SearchPageComponent', () => {
+fdescribe('SearchPageComponent', () => {
  let comp: SearchPageComponent;
  let fixture: ComponentFixture<SearchPageComponent>;
  let searchServiceObject: SearchService;
@@ -27,8 +27,8 @@ describe('SearchPageComponent', () => {
  };
  const mockCommunityList = [];
  const communityDataServiceStub = {
-    findAll: () => mockCommunityList,
-    findById: () => new Community()
+    findAll: () => Observable.of(mockCommunityList),
+    findById: () => Observable.of(new Community())
  };

  class RouterStub {
--- a/src/app/+search-page/search-page.component.ts
+++ b/src/app/+search-page/search-page.component.ts
@@ -1,15 +1,16 @@
-import { Component, OnInit, OnDestroy, ChangeDetectionStrategy } from '@angular/core';
-import { SearchService } from './search-service/search.service';
+import { ChangeDetectionStrategy, Component, OnDestroy, OnInit } from '@angular/core';
 import { ActivatedRoute } from '@angular/router';
-import { RemoteData } from '../core/data/remote-data';
-import { SearchResult } from './search-result.model';
-import { DSpaceObject } from '../core/shared/dspace-object.model';
+import { Observable } from 'rxjs/Observable';
 import { SortOptions } from '../core/cache/models/sort-options.model';
+import { CommunityDataService } from '../core/data/community-data.service';
+import { RemoteData } from '../core/data/remote-data';
+import { Community } from '../core/shared/community.model';
+import { DSpaceObject } from '../core/shared/dspace-object.model';
+import { isNotEmpty } from '../shared/empty.util';
 import { PaginationComponentOptions } from '../shared/pagination/pagination-component-options.model';
 import { SearchOptions } from './search-options.model';
-import { CommunityDataService } from '../core/data/community-data.service';
-import { isNotEmpty } from '../shared/empty.util';
-import { Community } from '../core/shared/community.model';
+import { SearchResult } from './search-result.model';
+import { SearchService } from './search-service/search.service';

 /**
 * This component renders a simple item page.
@@ -21,7 +22,7 @@ import { Community } from '../core/shared/community.model';
  selector: 'ds-search-page',
  styleUrls: ['./search-page.component.scss'],
  templateUrl: './search-page.component.html',
-  changeDetection: ChangeDetectionStrategy.OnPush
+  changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class SearchPageComponent implements OnInit, OnDestroy {

@@ -29,11 +30,11 @@ export class SearchPageComponent implements OnInit, OnDestroy {
  private scope: string;

  query: string;
-  scopeObject: RemoteData<DSpaceObject>;
-  results: RemoteData<Array<SearchResult<DSpaceObject>>>;
+  scopeObject: Observable<RemoteData<DSpaceObject>>;
+  results: Observable<RemoteData<Array<SearchResult<DSpaceObject>>>>;
  currentParams = {};
  searchOptions: SearchOptions;
-  scopeList: RemoteData<Community[]>;
+  scopeList: Observable<RemoteData<Community[]>>;

  constructor(
    private service: SearchService,
--- a/src/app/+search-page/search-results/search-results.component.html
+++ b/src/app/+search-page/search-results/search-results.component.html
@@ -1,7 +1,11 @@
-<h2 *ngIf="(searchResults.payload | async)?.length > 0">{{ 'search.results.title' | translate }}</h2>
-<ds-object-list
+<div *ngIf="searchResults?.hasSucceeded" @fadeIn>
+  <h2 *ngIf="searchResults?.payload?.length > 0">{{ 'search.results.title' | translate }}</h2>
+  <ds-object-list
    [config]="searchConfig.pagination"
    [sortConfig]="searchConfig.sort"
    [objects]="searchResults"
    [hideGear]="false">
-</ds-object-list>
+  </ds-object-list>
+</div>
+<ds-loading *ngIf="searchResults?.isLoading" message="{{'loading.search-results' | translate}}"></ds-loading>
+<ds-error *ngIf="searchResults?.hasFailed" message="{{'error.search-results' | translate}}"></ds-error>
--- a/src/app/+search-page/search-results/search-results.component.ts
+++ b/src/app/+search-page/search-results/search-results.component.ts
@@ -1,8 +1,9 @@
 import { Component, Input } from '@angular/core';
 import { RemoteData } from '../../core/data/remote-data';
-import { SearchResult } from '../search-result.model';
 import { DSpaceObject } from '../../core/shared/dspace-object.model';
+import { fadeIn, fadeInOut } from '../../shared/animations/fade';
 import { SearchOptions } from '../search-options.model';
+import { SearchResult } from '../search-result.model';

 /**
 * This component renders a simple item page.
@@ -12,6 +13,10 @@ import { SearchOptions } from '../search-options.model';
@Component({
  selector: 'ds-search-results',
  templateUrl: './search-results.component.html',
+  animations: [
+    fadeIn,
+    fadeInOut
+  ]
 })
 export class SearchResultsComponent {
  @Input() searchResults: RemoteData<Array<SearchResult<DSpaceObject>>>;
--- a/src/app/+search-page/search-service/search.service.ts
+++ b/src/app/+search-page/search-service/search.service.ts
@@ -80,7 +80,7 @@ export class SearchService {

  }

-  search(query: string, scopeId?: string, searchOptions?: SearchOptions): RemoteData<Array<SearchResult<DSpaceObject>>> {
+  search(query: string, scopeId?: string, searchOptions?: SearchOptions): Observable<RemoteData<Array<SearchResult<DSpaceObject>>>> {
    let self = `https://dspace7.4science.it/dspace-spring-rest/api/search?query=${query}`;
    if (hasValue(scopeId)) {
      self += `&scope=${scopeId}`;
@@ -98,8 +98,8 @@ export class SearchService {
      self += `&sortField=${searchOptions.sort.field}`;
    }

-    const errorMessage = Observable.of(undefined);
-    const statusCode = Observable.of('200');
+    const errorMessage = undefined;
+    const statusCode = '200';
    const returningPageInfo = new PageInfo();

    if (isNotEmpty(searchOptions)) {
@@ -110,19 +110,20 @@ export class SearchService {
      returningPageInfo.currentPage = 1;
    }

-    const itemsRD = this.itemDataService.findAll({
+    const itemsObs = this.itemDataService.findAll({
      scopeID: scopeId,
      currentPage: returningPageInfo.currentPage,
      elementsPerPage: returningPageInfo.elementsPerPage
    });

-    const pageInfo = itemsRD.pageInfo.map((info: PageInfo) => {
-      const totalElements = info.totalElements > 20 ? 20 : info.totalElements;
-      return Object.assign({}, info, { totalElements: totalElements });
-    });
+    return itemsObs
+      .filter((rd: RemoteData<Item[]>) => rd.hasSucceeded)
+      .map((rd: RemoteData<Item[]>) => {

-    const payload = itemsRD.payload.map((items: Item[]) => {
-      return shuffle(items)
+      const totalElements = rd.pageInfo.totalElements > 20 ? 20 : rd.pageInfo.totalElements;
+      const pageInfo = Object.assign({}, rd.pageInfo, { totalElements: totalElements });
+
+      const payload = shuffle(rd.payload)
        .map((item: Item, index: number) => {
          const mockResult: SearchResult<DSpaceObject> = new ItemSearchResult();
          mockResult.dspaceObject = item;
@@ -132,40 +133,49 @@ export class SearchService {
          mockResult.hitHighlights = new Array(highlight);
          return mockResult;
        });
-    });

      return new RemoteData(
-      Observable.of(self),
-      itemsRD.isRequestPending,
-      itemsRD.isResponsePending,
-      itemsRD.hasSucceeded,
+        self,
+        rd.isRequestPending,
+        rd.isResponsePending,
+        rd.hasSucceeded,
        errorMessage,
        statusCode,
        pageInfo,
        payload
      )
+    }).startWith(new RemoteData(
+        '',
+        true,
+        false,
+        undefined,
+        undefined,
+        undefined,
+        undefined,
+        undefined
+      ));
  }

-  getConfig(): RemoteData<SearchFilterConfig[]> {
-    const requestPending = Observable.of(false);
-    const responsePending = Observable.of(false);
-    const isSuccessful = Observable.of(true);
-    const errorMessage = Observable.of(undefined);
-    const statusCode = Observable.of('200');
-    const returningPageInfo = Observable.of(new PageInfo());
-    return new RemoteData(
-      Observable.of('https://dspace7.4science.it/dspace-spring-rest/api/search'),
+  getConfig(): Observable<RemoteData<SearchFilterConfig[]>> {
+    const requestPending = false;
+    const responsePending = false;
+    const isSuccessful = true;
+    const errorMessage = undefined;
+    const statusCode = '200';
+    const returningPageInfo = new PageInfo();
+    return Observable.of(new RemoteData(
+      'https://dspace7.4science.it/dspace-spring-rest/api/search',
      requestPending,
      responsePending,
      isSuccessful,
      errorMessage,
      statusCode,
      returningPageInfo,
-      Observable.of(this.config)
-    );
+      this.config
+    ));
  }

-  getFacetValuesFor(searchFilterConfigName: string): RemoteData<FacetValue[]> {
+  getFacetValuesFor(searchFilterConfigName: string): Observable<RemoteData<FacetValue[]>> {
    const values: FacetValue[] = [];
    for (let i = 0; i < 5; i++) {
      const value = searchFilterConfigName + ' ' + (i + 1);
@@ -175,21 +185,21 @@ export class SearchService {
        search: 'https://dspace7.4science.it/dspace-spring-rest/api/search?f.' + searchFilterConfigName + '=' + encodeURI(value)
      });
    }
-    const requestPending = Observable.of(false);
-    const responsePending = Observable.of(false);
-    const isSuccessful = Observable.of(true);
-    const errorMessage = Observable.of(undefined);
-    const statusCode = Observable.of('200');
-    const returningPageInfo = Observable.of(new PageInfo());
-    return new RemoteData(
-      Observable.of('https://dspace7.4science.it/dspace-spring-rest/api/search'),
+    const requestPending = false;
+    const responsePending = false;
+    const isSuccessful = true;
+    const errorMessage = undefined;
+    const statusCode = '200';
+    const returningPageInfo = new PageInfo();
+    return Observable.of(new RemoteData(
+      'https://dspace7.4science.it/dspace-spring-rest/api/search',
      requestPending,
      responsePending,
      isSuccessful,
      errorMessage,
      statusCode,
      returningPageInfo,
-      Observable.of(values)
-    );
+      values
+    ));
  }
 }
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@@ -4,7 +4,7 @@ import {
  Inject,
  ViewEncapsulation,
  OnInit,
-  HostListener
+  HostListener, SimpleChanges, OnChanges
 } from '@angular/core';

 import { TranslateService } from '@ngx-translate/core';
@@ -26,7 +26,7 @@ import { GLOBAL_CONFIG, GlobalConfig } from '../config';
  changeDetection: ChangeDetectionStrategy.Default,
  encapsulation: ViewEncapsulation.None
 })
-export class AppComponent implements OnInit {
+export class AppComponent implements OnInit, OnChanges {

  constructor(
    @Inject(GLOBAL_CONFIG) public config: GlobalConfig,
@@ -71,4 +71,9 @@ export class AppComponent implements OnInit {
    );
  }

+  ngOnChanges(changes: SimpleChanges): void {
+    console.log('AppComponent: onchanges called', changes);
+  }
+
+
 }
--- a/src/app/core/browse/browse.service.spec.ts
+++ b/src/app/core/browse/browse.service.spec.ts
@@ -72,30 +72,42 @@ describe('BrowseService', () => {
    })
  ];

-  beforeEach(() => {
-    scheduler = getTestScheduler();
-
-    responseCache = jasmine.createSpyObj('responseCache', {
+  function initMockResponseCacheService(isSuccessful: boolean) {
+    return jasmine.createSpyObj('responseCache', {
      get: cold('b-', {
        b: {
-          response: { browseDefinitions }
+          response: {
+            isSuccessful,
+            browseDefinitions,
+          }
        }
      })
    });
+  }

-    requestService = jasmine.createSpyObj('requestService', ['configure']);
+  function initMockRequestService() {
+    return jasmine.createSpyObj('requestService', ['configure']);
+  }

-    service = new BrowseService(
+  function initTestService() {
+    return new BrowseService(
      responseCache,
      requestService,
      envConfig
    );
+  }
+
+  beforeEach(() => {
+    scheduler = getTestScheduler();
  });

  describe('getBrowseURLFor', () => {

-    describe('when getEndpoint fires', () => {
+    describe('if getEndpoint fires', () => {
      beforeEach(() => {
+        responseCache = initMockResponseCacheService(true);
+        requestService = initMockRequestService();
+        service = initTestService();
        spyOn(service, 'getEndpoint').and
          .returnValue(hot('--a-', { a: browsesEndpointURL }));
      });
@@ -122,27 +134,27 @@ describe('BrowseService', () => {
        expect(result).toBeObservable(expected);
      });

-      it('should return undefined when the key doesn\'t match', () => {
+      it('should throw an error when the key doesn\'t match', () => {
        const metadatumKey = 'dc.title'; // isn't in the definitions
        const linkName = 'items';

        const result = service.getBrowseURLFor(metadatumKey, linkName);
-        const expected = cold('c---', { c: undefined });
+        const expected = cold('c-#-', { c: undefined }, new Error(`A browse endpoint for ${linkName} on ${metadatumKey} isn't configured`));

        expect(result).toBeObservable(expected);
      });

-      it('should return undefined when the link doesn\'t match', () => {
+      it('should throw an error when the link doesn\'t match', () => {
        const metadatumKey = 'dc.date.issued';
        const linkName = 'collections'; // isn't in the definitions

        const result = service.getBrowseURLFor(metadatumKey, linkName);
-        const expected = cold('c---', { c: undefined });
+        const expected = cold('c-#-', { c: undefined }, new Error(`A browse endpoint for ${linkName} on ${metadatumKey} isn't configured`));

        expect(result).toBeObservable(expected);
      });

-      it('should configure a new BrowseEndpointRequest', (done: DoneFn) => {
+      it('should configure a new BrowseEndpointRequest', () => {
        const metadatumKey = 'dc.date.issued';
        const linkName = 'items';
        const expected = new BrowseEndpointRequest(browsesEndpointURL);
@@ -150,17 +162,17 @@ describe('BrowseService', () => {
        scheduler.schedule(() => service.getBrowseURLFor(metadatumKey, linkName).subscribe());
        scheduler.flush();

-        setTimeout(() => {
        expect(requestService.configure).toHaveBeenCalledWith(expected);
-          done();
-        }, 0);

      });

    });

-    describe('when getEndpoint doesn\'t fire', () => {
-      it('should return undefined as long as getEndpoint hasn\'t fired', () => {
+    describe('if getEndpoint doesn\'t fire', () => {
+      it('should return undefined', () => {
+        responseCache = initMockResponseCacheService(true);
+        requestService = initMockRequestService();
+        service = initTestService();
        spyOn(service, 'getEndpoint').and
          .returnValue(hot('----'));

@@ -172,5 +184,22 @@ describe('BrowseService', () => {
        expect(result).toBeObservable(expected);
      });
    });
+
+    describe('if the browses endpoint can\'t be retrieved', () => {
+      it('should throw an error', () => {
+        responseCache = initMockResponseCacheService(false);
+        requestService = initMockRequestService();
+        service = initTestService();
+        spyOn(service, 'getEndpoint').and
+          .returnValue(hot('--a-', { a: browsesEndpointURL }));
+
+        const metadatumKey = 'dc.date.issued';
+        const linkName = 'items';
+
+        const result = service.getBrowseURLFor(metadatumKey, linkName);
+        const expected = cold('c-#-', { c: undefined }, new Error(`Couldn't retrieve the browses endpoint`));
+        expect(result).toBeObservable(expected);
+      });
+    });
  });
 });
--- a/src/app/core/browse/browse.service.ts
+++ b/src/app/core/browse/browse.service.ts
@@ -1,15 +1,15 @@
 import { Inject, Injectable } from '@angular/core';
-import { HALEndpointService } from '../shared/hal-endpoint.service';
-import { ResponseCacheService } from '../cache/response-cache.service';
-import { RequestService } from '../data/request.service';
-import { GlobalConfig } from '../../../config/global-config.interface';
-import { GLOBAL_CONFIG } from '../../../config';
-import { BrowseEndpointRequest, RestRequest } from '../data/request.models';
-import { ResponseCacheEntry } from '../cache/response-cache.reducer';
-import { BrowseSuccessResponse } from '../cache/response-cache.models';
-import { isNotEmpty } from '../../shared/empty.util';
-import { BrowseDefinition } from '../shared/browse-definition.model';
 import { Observable } from 'rxjs/Observable';
+import { GLOBAL_CONFIG } from '../../../config';
+import { GlobalConfig } from '../../../config/global-config.interface';
+import { isEmpty, isNotEmpty } from '../../shared/empty.util';
+import { BrowseSuccessResponse, ErrorResponse, RestResponse } from '../cache/response-cache.models';
+import { ResponseCacheEntry } from '../cache/response-cache.reducer';
+import { ResponseCacheService } from '../cache/response-cache.service';
+import { BrowseEndpointRequest, RestRequest } from '../data/request.models';
+import { RequestService } from '../data/request.service';
+import { BrowseDefinition } from '../shared/browse-definition.model';
+import { HALEndpointService } from '../shared/hal-endpoint.service';

@Injectable()
 export class BrowseService extends HALEndpointService {
@@ -41,23 +41,32 @@ export class BrowseService extends HALEndpointService {
      .filter((href: string) => isNotEmpty(href))
      .distinctUntilChanged()
      .map((endpointURL: string) => new BrowseEndpointRequest(endpointURL))
-      .do((request: RestRequest) => {
-        setTimeout(() => {
-          this.requestService.configure(request);
-        }, 0);
-      })
-      .flatMap((request: RestRequest) => this.responseCache.get(request.href)
+      .do((request: RestRequest) => this.requestService.configure(request))
+      .flatMap((request: RestRequest) => {
+        const [successResponse, errorResponse] = this.responseCache.get(request.href)
          .map((entry: ResponseCacheEntry) => entry.response)
-        .filter((response: BrowseSuccessResponse) => isNotEmpty(response) && isNotEmpty(response.browseDefinitions))
+          .partition((response: RestResponse) => response.isSuccessful);
+
+        return Observable.merge(
+          errorResponse.flatMap((response: ErrorResponse) =>
+            Observable.throw(new Error(`Couldn't retrieve the browses endpoint`))),
+          successResponse
+            .filter((response: BrowseSuccessResponse) => isNotEmpty(response.browseDefinitions))
            .map((response: BrowseSuccessResponse) => response.browseDefinitions)
            .map((browseDefinitions: BrowseDefinition[]) => browseDefinitions
              .find((def: BrowseDefinition) => {
                const matchingKeys = def.metadataKeys.find((key: string) => searchKeyArray.indexOf(key) >= 0);
                return isNotEmpty(matchingKeys);
              })
-        ).filter((def: BrowseDefinition) => isNotEmpty(def) && isNotEmpty(def._links))
-        .map((def: BrowseDefinition) => def._links[linkName])
-      ).startWith(undefined)
+            ).map((def: BrowseDefinition) => {
+            if (isEmpty(def) || isEmpty(def._links) || isEmpty(def._links[linkName])) {
+              throw new Error(`A browse endpoint for ${linkName} on ${metadatumKey} isn't configured`);
+            } else {
+              return def._links[linkName];
+            }
+          })
+        );
+      }).startWith(undefined)
      .distinctUntilChanged();
  }

--- a/src/app/core/cache/builders/remote-data-build.service.ts
+++ b/src/app/core/cache/builders/remote-data-build.service.ts
@@ -28,7 +28,7 @@ export class RemoteDataBuildService {
  buildSingle<TNormalized extends CacheableObject, TDomain>(
    hrefObs: string | Observable<string>,
    normalizedType: GenericConstructor<TNormalized>
-  ): RemoteData<TDomain> {
+  ): Observable<RemoteData<TDomain>> {
    if (typeof hrefObs === 'string') {
      hrefObs = Observable.of(hrefObs);
    }
@@ -49,46 +49,8 @@ export class RemoteDataBuildService {
      requestHrefObs.flatMap((requestHref) => this.responseCache.get(requestHref)).filter((entry) => hasValue(entry))
    );

-    const requestPending = requestObs
-      .map((entry: RequestEntry) => entry.requestPending)
-      .startWith(true)
-      .distinctUntilChanged();
-
-    const responsePending = requestObs
-      .map((entry: RequestEntry) => entry.responsePending)
-      .startWith(false)
-      .distinctUntilChanged();
-
-    const isSuccessFul = responseCacheObs
-      .map((entry: ResponseCacheEntry) => entry.response.isSuccessful)
-      .startWith(false)
-      .distinctUntilChanged();
-
-    const errorMessage = responseCacheObs
-      .filter((entry: ResponseCacheEntry) => !entry.response.isSuccessful)
-      .map((entry: ResponseCacheEntry) => (entry.response as ErrorResponse).errorMessage)
-      .distinctUntilChanged();
-
-    const statusCode = responseCacheObs
-      .map((entry: ResponseCacheEntry) => entry.response.statusCode)
-      .distinctUntilChanged();
-
-    /* tslint:disable:no-string-literal */
-    const pageInfo = responseCacheObs
-      .filter((entry: ResponseCacheEntry) => hasValue(entry.response) && hasValue(entry.response['pageInfo']))
-      .map((entry: ResponseCacheEntry) => (entry.response as DSOSuccessResponse).pageInfo)
-      .map((pInfo: PageInfo) => {
-        if (isNotEmpty(pageInfo) && pInfo.currentPage >= 0) {
-          return Object.assign({}, pInfo, {currentPage: pInfo.currentPage + 1});
-        } else {
-          return pInfo;
-        }
-      })
-      .distinctUntilChanged();
-    /* tslint:enable:no-string-literal */
-
    // always use self link if that is cached, only if it isn't, get it via the response.
-    const payload =
+    const payloadObs =
      Observable.combineLatest(
        hrefObs.flatMap((href: string) => this.objectCache.getBySelfLink<TNormalized>(href, normalizedType))
          .startWith(undefined),
@@ -114,10 +76,38 @@ export class RemoteDataBuildService {
      ).filter((normalized) => hasValue(normalized))
        .map((normalized: TNormalized) => {
          return this.build<TNormalized, TDomain>(normalized);
-        }).distinctUntilChanged();
+        })
+        .startWith(undefined)
+        .distinctUntilChanged();
+    return this.toRemoteDataObservable(hrefObs, requestObs, responseCacheObs, payloadObs);
+  }
+
+  private toRemoteDataObservable<T>(hrefObs: Observable<string>, requestObs: Observable<RequestEntry>, responseCacheObs: Observable<ResponseCacheEntry>, payloadObs: Observable<T>) {
+    return Observable.combineLatest(hrefObs, requestObs, responseCacheObs.startWith(undefined), payloadObs,
+      (href: string, reqEntry: RequestEntry, resEntry: ResponseCacheEntry, payload: T) => {
+        const requestPending = hasValue(reqEntry.requestPending) ? reqEntry.requestPending : true;
+        const responsePending = hasValue(reqEntry.responsePending) ? reqEntry.responsePending : false;
+        let isSuccessFul: boolean;
+        let errorMessage: string;
+        let statusCode: string;
+        let pageInfo: PageInfo;
+        if (hasValue(resEntry) && hasValue(resEntry.response)) {
+          isSuccessFul = resEntry.response.isSuccessful;
+          errorMessage = isSuccessFul === false ? (resEntry.response as ErrorResponse).errorMessage : undefined;
+          statusCode = resEntry.response.statusCode;
+
+          if (hasValue((resEntry.response as DSOSuccessResponse).pageInfo)) {
+            const resPageInfo = (resEntry.response as DSOSuccessResponse).pageInfo;
+            if (isNotEmpty(resPageInfo) && resPageInfo.currentPage >= 0) {
+              pageInfo = Object.assign({}, resPageInfo, { currentPage: resPageInfo.currentPage + 1 });
+            } else {
+              pageInfo = resPageInfo;
+            }
+          }
+        }

        return new RemoteData(
-      hrefObs,
+          href,
          requestPending,
          responsePending,
          isSuccessFul,
@@ -126,12 +116,13 @@ export class RemoteDataBuildService {
          pageInfo,
          payload
        );
+      });
  }

  buildList<TNormalized extends CacheableObject, TDomain>(
    hrefObs: string | Observable<string>,
    normalizedType: GenericConstructor<TNormalized>
-  ): RemoteData<TDomain[]> {
+  ): Observable<RemoteData<TDomain[]>> {
    if (typeof hrefObs === 'string') {
      hrefObs = Observable.of(hrefObs);
    }
@@ -141,38 +132,7 @@ export class RemoteDataBuildService {
    const responseCacheObs = hrefObs.flatMap((href: string) => this.responseCache.get(href))
      .filter((entry) => hasValue(entry));

-    const requestPending = requestObs
-      .map((entry: RequestEntry) => entry.requestPending)
-      .startWith(true)
-      .distinctUntilChanged();
-
-    const responsePending = requestObs
-      .map((entry: RequestEntry) => entry.responsePending)
-      .startWith(false)
-      .distinctUntilChanged();
-
-    const isSuccessFul = responseCacheObs
-      .map((entry: ResponseCacheEntry) => entry.response.isSuccessful)
-      .startWith(false)
-      .distinctUntilChanged();
-
-    const errorMessage = responseCacheObs
-      .filter((entry: ResponseCacheEntry) => !entry.response.isSuccessful)
-      .map((entry: ResponseCacheEntry) => (entry.response as ErrorResponse).errorMessage)
-      .distinctUntilChanged();
-
-    const statusCode = responseCacheObs
-      .map((entry: ResponseCacheEntry) => entry.response.statusCode)
-      .distinctUntilChanged();
-
-    /* tslint:disable:no-string-literal */
-    const pageInfo = responseCacheObs
-      .filter((entry: ResponseCacheEntry) => hasValue(entry.response) && hasValue(entry.response['pageInfo']))
-      .map((entry: ResponseCacheEntry) => (entry.response as DSOSuccessResponse).pageInfo)
-      .distinctUntilChanged();
-    /* tslint:enable:no-string-literal */
-
-    const payload = responseCacheObs
+    const payloadObs = responseCacheObs
      .filter((entry: ResponseCacheEntry) => entry.response.isSuccessful)
      .map((entry: ResponseCacheEntry) => (entry.response as DSOSuccessResponse).resourceSelfLinks)
      .flatMap((resourceUUIDs: string[]) => {
@@ -183,18 +143,10 @@ export class RemoteDataBuildService {
            });
          });
      })
+      .startWith([])
      .distinctUntilChanged();

-    return new RemoteData(
-      hrefObs,
-      requestPending,
-      responsePending,
-      isSuccessFul,
-      errorMessage,
-      statusCode,
-      pageInfo,
-      payload
-    );
+    return this.toRemoteDataObservable(hrefObs, requestObs, responseCacheObs, payloadObs);
  }

  build<TNormalized extends CacheableObject, TDomain>(normalized: TNormalized): TDomain {
@@ -207,13 +159,9 @@ export class RemoteDataBuildService {
        const { resourceType, isList } = getRelationMetadata(normalized, relationship);
        const resourceConstructor = NormalizedObjectFactory.getConstructor(resourceType);
        if (Array.isArray(normalized[relationship])) {
-          // without the setTimeout, the actions inside requestService.configure
-          // are dispatched, but sometimes don't arrive. I'm unsure why atm.
-          setTimeout(() => {
          normalized[relationship].forEach((href: string) => {
            this.requestService.configure(new RestRequest(href))
          });
-          }, 0);

          const rdArr = [];
          normalized[relationship].forEach((href: string) => {
@@ -226,11 +174,7 @@ export class RemoteDataBuildService {
            links[relationship] = rdArr[0];
          }
        } else {
-          // without the setTimeout, the actions inside requestService.configure
-          // are dispatched, but sometimes don't arrive. I'm unsure why atm.
-          setTimeout(() => {
          this.requestService.configure(new RestRequest(normalized[relationship]));
-          }, 0);

          // The rest API can return a single URL to represent a list of resources (e.g. /items/:id/bitstreams)
          // in that case only 1 href will be stored in the normalized obj (so the isArray above fails),
@@ -248,55 +192,46 @@ export class RemoteDataBuildService {
    return Object.assign(new domainModel(), normalized, links);
  }

-  aggregate<T>(input: Array<RemoteData<T>>): RemoteData<T[]> {
-    const requestPending = Observable.combineLatest(
-      ...input.map((rd) => rd.isRequestPending),
-    ).map((...pendingArray) => pendingArray.every((e) => e === true))
-      .distinctUntilChanged();
+  aggregate<T>(input: Array<Observable<RemoteData<T>>>): Observable<RemoteData<T[]>> {
+    return Observable.combineLatest(
+      ...input,
+      (...arr: Array<RemoteData<T>>) => {
+        const requestPending: boolean = arr
+          .map((d: RemoteData<T>) => d.isRequestPending)
+          .every((b: boolean) => b === true);

-    const responsePending = Observable.combineLatest(
-      ...input.map((rd) => rd.isResponsePending),
-    ).map((...pendingArray) => pendingArray.every((e) => e === true))
-      .distinctUntilChanged();
+        const responsePending: boolean = arr
+          .map((d: RemoteData<T>) => d.isResponsePending)
+          .every((b: boolean) => b === true);

-    const isSuccessFul = Observable.combineLatest(
-      ...input.map((rd) => rd.hasSucceeded),
-    ).map((...successArray) => successArray.every((e) => e === true))
-      .distinctUntilChanged();
+        const isSuccessFul: boolean = arr
+          .map((d: RemoteData<T>) => d.hasSucceeded)
+          .every((b: boolean) => b === true);

-    const errorMessage = Observable.combineLatest(
-      ...input.map((rd) => rd.errorMessage),
-    ).map((...errors) => errors
-      .map((e, idx) => {
+        const errorMessage: string = arr
+          .map((d: RemoteData<T>) => d.errorMessage)
+          .map((e: string, idx: number) => {
            if (hasValue(e)) {
              return `[${idx}]: ${e}`;
            }
-      })
-      .filter((e) => hasValue(e))
-      .join(', ')
-      );
+          }).filter((e: string) => hasValue(e))
+          .join(', ');

-    const statusCode = Observable.combineLatest(
-      ...input.map((rd) => rd.statusCode),
-    ).map((...statusCodes) => statusCodes
-      .map((code, idx) => {
-        if (hasValue(code)) {
-          return `[${idx}]: ${code}`;
+        const statusCode: string = arr
+          .map((d: RemoteData<T>) => d.statusCode)
+          .map((c: string, idx: number) => {
+            if (hasValue(c)) {
+              return `[${idx}]: ${c}`;
            }
-      })
-      .filter((c) => hasValue(c))
-      .join(', ')
-      );
+          }).filter((c: string) => hasValue(c))
+          .join(', ');

-    const pageInfo = Observable.of(undefined);
+        const pageInfo = undefined;

-    const payload = Observable.combineLatest(...input.map((rd) => rd.payload)) as Observable<T[]>;
+        const payload: T[] = arr.map((d: RemoteData<T>) => d.payload);

        return new RemoteData(
-      // This is an aggregated object, it doesn't necessarily correspond
-      // to a single REST endpoint, so instead of a self link, use the
-      // current time in ms for a somewhat unique id
-      Observable.of(`${new Date().getTime()}`),
+          `dspace-angular://aggregated/object/${new Date().getTime()}`,
          requestPending,
          responsePending,
          isSuccessFul,
@@ -305,6 +240,7 @@ export class RemoteDataBuildService {
          pageInfo,
          payload
        );
+      })
  }

 }
--- a/src/app/core/cache/response-cache.service.ts
+++ b/src/app/core/cache/response-cache.service.ts
@@ -4,7 +4,7 @@ import { MemoizedSelector, Store } from '@ngrx/store';
 import { Observable } from 'rxjs/Observable';

 import { ResponseCacheEntry } from './response-cache.reducer';
-import { hasNoValue } from '../../shared/empty.util';
+import { hasNoValue, hasValue } from '../../shared/empty.util';
 import { ResponseCacheRemoveAction, ResponseCacheAddAction } from './response-cache.actions';
 import { RestResponse } from './response-cache.models';
 import { CoreState } from '../core.reducers';
--- a/src/app/core/data/comcol-data.service.spec.ts
+++ b/src/app/core/data/comcol-data.service.spec.ts
@@ -53,6 +53,7 @@ describe('ComColDataService', () => {
  const communitiesEndpoint = 'https://rest.api/core/communities';
  const communityEndpoint = `${communitiesEndpoint}/${scopeID}`;
  const scopedEndpoint = `${communityEndpoint}/${LINK_NAME}`;
+  const serviceEndpoint = `https://rest.api/core/${LINK_NAME}`;

  function initMockCommunityDataService(): CommunityDataService {
    return jasmine.createSpyObj('responseCache', {
@@ -102,7 +103,7 @@ describe('ComColDataService', () => {
      scheduler = getTestScheduler();
    });

-    it('should configure a new FindByIDRequest for the scope Community', (done: DoneFn) => {
+    it('should configure a new FindByIDRequest for the scope Community', () => {
      cds = initMockCommunityDataService();
      requestService = initMockRequestService();
      objectCache = initMockObjectCacheService();
@@ -114,10 +115,7 @@ describe('ComColDataService', () => {
      scheduler.schedule(() => service.getScopedEndpoint(scopeID).subscribe());
      scheduler.flush();

-      setTimeout(() => {
      expect(requestService.configure).toHaveBeenCalledWith(expected);
-        done();
-      }, 0);
    });

    describe('if the scope Community can be found', () => {
@@ -159,5 +157,25 @@ describe('ComColDataService', () => {
        expect(result).toBeObservable(expected);
      });
    });
+
+    describe('if the scope is not specified', () => {
+      beforeEach(() => {
+        cds = initMockCommunityDataService();
+        requestService = initMockRequestService();
+        objectCache = initMockObjectCacheService();
+        responseCache = initMockResponceCacheService(true);
+        service = initTestService();
+      });
+
+      it('should return this.getEndpoint()', () => {
+        spyOn(service, 'getEndpoint').and.returnValue(cold('--e-', { e: serviceEndpoint }))
+
+        const result = service.getScopedEndpoint(undefined);
+        const expected = cold('--f-', { f: serviceEndpoint });
+
+        expect(result).toBeObservable(expected);
+      });
+    });
+
  });
 });
--- a/src/app/core/data/comcol-data.service.ts
+++ b/src/app/core/data/comcol-data.service.ts
@@ -1,14 +1,14 @@
 import { Observable } from 'rxjs/Observable';
-import { isNotEmpty } from '../../shared/empty.util';
+import { isEmpty, isNotEmpty } from '../../shared/empty.util';
 import { NormalizedCommunity } from '../cache/models/normalized-community.model';
 import { CacheableObject } from '../cache/object-cache.reducer';
-import { DSOSuccessResponse, RestResponse } from '../cache/response-cache.models';
+import { ObjectCacheService } from '../cache/object-cache.service';
+import { DSOSuccessResponse, ErrorResponse, RestResponse } from '../cache/response-cache.models';
 import { ResponseCacheEntry } from '../cache/response-cache.reducer';
 import { CommunityDataService } from './community-data.service';

 import { DataService } from './data.service';
 import { FindByIDRequest } from './request.models';
-import { ObjectCacheService } from '../cache/object-cache.service';

 export abstract class ComColDataService<TNormalized extends CacheableObject, TDomain>  extends DataService<TNormalized, TDomain> {
  protected abstract cds: CommunityDataService;
@@ -25,15 +25,16 @@ export abstract class ComColDataService<TNormalized extends CacheableObject, TDo
   *    an Observable<string> containing the scoped URL
   */
  public getScopedEndpoint(scopeID: string): Observable<string> {
+    if (isEmpty(scopeID)) {
+      return this.getEndpoint();
+    } else {
      const scopeCommunityHrefObs = this.cds.getEndpoint()
        .flatMap((endpoint: string) => this.cds.getFindByIDHref(endpoint, scopeID))
        .filter((href: string) => isNotEmpty(href))
        .take(1)
        .do((href: string) => {
          const request = new FindByIDRequest(href, scopeID);
-        setTimeout(() => {
          this.requestService.configure(request);
-        }, 0);
        });

      const [successResponse, errorResponse] = scopeCommunityHrefObs
@@ -43,7 +44,7 @@ export abstract class ComColDataService<TNormalized extends CacheableObject, TDo
        .partition((response: RestResponse) => response.isSuccessful);

      return Observable.merge(
-      errorResponse.flatMap((response: DSOSuccessResponse) =>
+        errorResponse.flatMap((response: ErrorResponse) =>
          Observable.throw(new Error(`The Community with scope ${scopeID} couldn't be retrieved`))),
        successResponse
          .flatMap((response: DSOSuccessResponse) => this.objectCache.getByUUID(scopeID, NormalizedCommunity))
@@ -51,4 +52,5 @@ export abstract class ComColDataService<TNormalized extends CacheableObject, TDo
          .filter((href) => isNotEmpty(href))
      ).distinctUntilChanged();
    }
+  }
 }
--- a/src/app/core/data/data.service.ts
+++ b/src/app/core/data/data.service.ts
@@ -11,6 +11,7 @@ import { HALEndpointService } from '../shared/hal-endpoint.service';
 import { RemoteData } from './remote-data';
 import { FindAllOptions, FindAllRequest, FindByIDRequest, RestRequest } from './request.models';
 import { RequestService } from './request.service';
+import { URLCombiner } from '../url-combiner/url-combiner';

 export abstract class DataService<TNormalized extends CacheableObject, TDomain> extends HALEndpointService {
  protected abstract responseCache: ResponseCacheService;
@@ -29,11 +30,12 @@ export abstract class DataService<TNormalized extends CacheableObject, TDomain>
  public abstract getScopedEndpoint(scope: string): Observable<string>

  protected getFindAllHref(endpoint, options: FindAllOptions = {}): Observable<string> {
-    let result;
+    let result: Observable<string>;
    const args = [];

    if (hasValue(options.scopeID)) {
-      result = this.getScopedEndpoint(options.scopeID);
+      result = this.getScopedEndpoint(options.scopeID).distinctUntilChanged();
+      // result.take(1).subscribe((r) => console.log('result', r));
    } else {
      result = Observable.of(endpoint);
    }
@@ -56,22 +58,22 @@ export abstract class DataService<TNormalized extends CacheableObject, TDomain>
    }

    if (isNotEmpty(args)) {
-      return result.map((href: string) => `${href}?${args.join('&')}`);
+      return result.map((href: string) => new URLCombiner(href, `?${args.join('&')}`).toString());
    } else {
      return result;
    }
  }

-  findAll(options: FindAllOptions = {}): RemoteData<TDomain[]> {
-    const hrefObs = this.getEndpoint()
+  findAll(options: FindAllOptions = {}): Observable<RemoteData<TDomain[]>> {
+    const hrefObs = this.getEndpoint().filter((href: string) => isNotEmpty(href))
      .flatMap((endpoint: string) => this.getFindAllHref(endpoint, options));

    hrefObs
+      .filter((href: string) => hasValue(href))
+      .take(1)
      .subscribe((href: string) => {
        const request = new FindAllRequest(href, options);
-        setTimeout(() => {
        this.requestService.configure(request);
-        }, 0);
      });

    return this.rdbService.buildList<TNormalized, TDomain>(hrefObs, this.normalizedResourceType);
@@ -81,27 +83,24 @@ export abstract class DataService<TNormalized extends CacheableObject, TDomain>
    return `${endpoint}/${resourceID}`;
  }

-  findById(id: string): RemoteData<TDomain> {
+  findById(id: string): Observable<RemoteData<TDomain>> {
    const hrefObs = this.getEndpoint()
      .map((endpoint: string) => this.getFindByIDHref(endpoint, id));

    hrefObs
+      .filter((href: string) => hasValue(href))
+      .take(1)
      .subscribe((href: string) => {
        const request = new FindByIDRequest(href, id);
-        setTimeout(() => {
        this.requestService.configure(request);
-        }, 0);
      });

    return this.rdbService.buildSingle<TNormalized, TDomain>(hrefObs, this.normalizedResourceType);
  }

-  findByHref(href: string): RemoteData<TDomain> {
-    setTimeout(() => {
+  findByHref(href: string): Observable<RemoteData<TDomain>> {
    this.requestService.configure(new RestRequest(href));
-    }, 0);
    return this.rdbService.buildSingle<TNormalized, TDomain>(href, this.normalizedResourceType);
-    // return this.rdbService.buildSingle(href));
  }

 }
--- a/src/app/core/data/remote-data.ts
+++ b/src/app/core/data/remote-data.ts
@@ -14,57 +14,48 @@ export enum RemoteDataState {
 */
 export class RemoteData<T> {
  constructor(
-    public self: Observable<string>,
-    private requestPending: Observable<boolean>,
-    private responsePending: Observable<boolean>,
-    private isSuccessFul: Observable<boolean>,
-    public errorMessage: Observable<string>,
-    public statusCode: Observable<string>,
-    public pageInfo: Observable<PageInfo>,
-    public payload: Observable<T>
+    public self: string,
+    private requestPending: boolean,
+    private responsePending: boolean,
+    private isSuccessFul: boolean,
+    public errorMessage: string,
+    public statusCode: string,
+    public pageInfo: PageInfo,
+    public payload: T
  ) {
  }

-  get state(): Observable<RemoteDataState> {
-    return Observable.combineLatest(
-      this.requestPending,
-      this.responsePending,
-      this.isSuccessFul,
-      (requestPending, responsePending, isSuccessFul) => {
-        if (requestPending) {
-          return RemoteDataState.RequestPending
-        } else if (responsePending) {
-          return RemoteDataState.ResponsePending
-        } else if (!isSuccessFul) {
-          return RemoteDataState.Failed
-        } else {
+  get state(): RemoteDataState {
+    if (this.isSuccessFul === true) {
      return RemoteDataState.Success
+    } else if (this.isSuccessFul === false) {
+      return RemoteDataState.Failed
+    } else if (this.requestPending === true) {
+      return RemoteDataState.RequestPending
+    } else if (this.responsePending === true || this.isSuccessFul === undefined) {
+      return RemoteDataState.ResponsePending
    }
  }
-    ).distinctUntilChanged();
-  }

-  get isRequestPending(): Observable<boolean> {
-    return this.state.map((state) => state === RemoteDataState.RequestPending).distinctUntilChanged();
+  get isRequestPending(): boolean {
+    return this.state === RemoteDataState.RequestPending;
  }

-  get isResponsePending(): Observable<boolean> {
-    return this.state.map((state) => state === RemoteDataState.ResponsePending).distinctUntilChanged();
+  get isResponsePending(): boolean {
+    return this.state === RemoteDataState.ResponsePending;
  }

-  get isLoading(): Observable<boolean> {
-    return this.state.map((state) => {
-      return state === RemoteDataState.RequestPending
-        || state === RemoteDataState.ResponsePending
-    }).distinctUntilChanged();
+  get isLoading(): boolean {
+    return this.state === RemoteDataState.RequestPending
+      || this.state === RemoteDataState.ResponsePending;
  }

-  get hasFailed(): Observable<boolean> {
-    return this.state.map((state) => state === RemoteDataState.Failed).distinctUntilChanged();
+  get hasFailed(): boolean {
+    return this.state === RemoteDataState.Failed;
  }

-  get hasSucceeded(): Observable<boolean> {
-    return this.state.map((state) => state === RemoteDataState.Success).distinctUntilChanged();
+  get hasSucceeded(): boolean {
+    return this.state === RemoteDataState.Success;
  }

 }
--- a/src/app/core/data/request.service.ts
+++ b/src/app/core/data/request.service.ts
@@ -22,6 +22,7 @@ function entryFromHrefSelector(href: string): MemoizedSelector<CoreState, Reques

@Injectable()
 export class RequestService {
+  private requestsOnTheirWayToTheStore: string[] = [];

  constructor(
    private objectCache: ObjectCacheService,
@@ -31,6 +32,12 @@ export class RequestService {
  }

  isPending(href: string): boolean {
+    // first check requests that haven't made it to the store yet
+    if (this.requestsOnTheirWayToTheStore.includes(href)) {
+      return true;
+    }
+
+    // then check the store
    let isPending = false;
    this.store.select(entryFromHrefSelector(href))
      .take(1)
@@ -75,6 +82,24 @@ export class RequestService {
    if (!(isCached || isPending)) {
      this.store.dispatch(new RequestConfigureAction(request));
      this.store.dispatch(new RequestExecuteAction(request.href));
+      this.trackRequestsOnTheirWayToTheStore(request.href);
    }
  }
+
+  /**
+   * ngrx action dispatches are asynchronous. But this.isPending needs to return true as soon as the
+   * configure method for a request has been executed, otherwise certain requests will happen multiple times.
+   *
+   * This method will store the href of every request that gets configured in a local variable, and
+   * remove it as soon as it can be found in the store.
+   */
+  private trackRequestsOnTheirWayToTheStore(href: string) {
+    this.requestsOnTheirWayToTheStore = [...this.requestsOnTheirWayToTheStore, href];
+    this.store.select(entryFromHrefSelector(href))
+      .filter((re: RequestEntry) => hasValue(re))
+      .take(1)
+      .subscribe((re: RequestEntry) => {
+        this.requestsOnTheirWayToTheStore = this.requestsOnTheirWayToTheStore.filter((pendingHref: string) => pendingHref !== href)
+      });
+  }
 }
--- a/src/app/core/metadata/metadata.service.spec.ts
+++ b/src/app/core/metadata/metadata.service.spec.ts
@@ -31,6 +31,7 @@ import { Item } from '../../core/shared/item.model';
 import { MockItem } from '../../shared/mocks/mock-item';
 import { MockTranslateLoader } from '../../shared/mocks/mock-translate-loader';
 import { BrowseService } from '../browse/browse.service';
+import { PageInfo } from '../shared/page-info.model';

 /* tslint:disable:max-classes-per-file */
@Component({
@@ -175,33 +176,17 @@ describe('MetadataService', () => {
    expect(tagStore.get('description')[0].content).toEqual('This is a dummy item component for testing!');
  }));

-  const mockRemoteData = (mockItem: Item): RemoteData<Item> => {
-    return new RemoteData<Item>(
-      Observable.create((observer) => {
-        observer.next('');
-      }),
-      Observable.create((observer) => {
-        observer.next(false);
-      }),
-      Observable.create((observer) => {
-        observer.next(false);
-      }),
-      Observable.create((observer) => {
-        observer.next(true);
-      }),
-      Observable.create((observer) => {
-        observer.next('');
-      }),
-      Observable.create((observer) => {
-        observer.next(200);
-      }),
-      Observable.create((observer) => {
-        observer.next({});
-      }),
-      Observable.create((observer) => {
-        observer.next(MockItem);
-      })
-    );
+  const mockRemoteData = (mockItem: Item): Observable<RemoteData<Item>> => {
+    return Observable.of(new RemoteData<Item>(
+      '',
+      false,
+      false,
+      true,
+      '',
+      '200',
+      {} as PageInfo,
+      MockItem
+    ));
  }

  const mockType = (mockItem: Item, type: string): Item => {
--- a/src/app/core/metadata/metadata.service.ts
+++ b/src/app/core/metadata/metadata.service.ts
@@ -25,6 +25,8 @@ import { Item } from '../shared/item.model';
 import { Metadatum } from '../shared/metadatum.model';

 import { GLOBAL_CONFIG, GlobalConfig } from '../../../config';
+import { BitstreamFormat } from '../shared/bitstream-format.model';
+import { hasValue } from '../../shared/empty.util';

@Injectable()
 export class MetadataService {
@@ -64,8 +66,11 @@ export class MetadataService {
      });
  }

-  public processRemoteData(remoteData: RemoteData<CacheableObject>): void {
-    remoteData.payload.take(1).subscribe((dspaceObject: DSpaceObject) => {
+  public processRemoteData(remoteData: Observable<RemoteData<CacheableObject>>): void {
+    remoteData.map((rd: RemoteData<CacheableObject>) => rd.payload)
+      .filter((co: CacheableObject) => hasValue(co))
+      .take(1)
+      .subscribe((dspaceObject: DSpaceObject) => {
        if (!this.initialized) {
          this.initialize(dspaceObject);
        }
@@ -268,7 +273,10 @@ export class MetadataService {
      // taking only two, fist one is empty array
      item.getFiles().take(2).subscribe((bitstreams: Bitstream[]) => {
        for (const bitstream of bitstreams) {
-          bitstream.format.payload.take(1).subscribe((format) => {
+          bitstream.format.take(1)
+            .map((rd: RemoteData<BitstreamFormat>) => rd.payload)
+            .filter((format: BitstreamFormat) => hasValue(format))
+            .subscribe((format: BitstreamFormat) => {
              if (format.mimetype === 'application/pdf') {
                this.addMetaTag('citation_pdf_url', bitstream.content);
              }
--- a/src/app/core/shared/bitstream.model.ts
+++ b/src/app/core/shared/bitstream.model.ts
@@ -2,6 +2,7 @@ import { DSpaceObject } from './dspace-object.model';
 import { RemoteData } from '../data/remote-data';
 import { Item } from './item.model';
 import { BitstreamFormat } from './bitstream-format.model';
+import { Observable } from 'rxjs/Observable';

 export class Bitstream extends DSpaceObject {

@@ -23,17 +24,17 @@ export class Bitstream extends DSpaceObject {
  /**
   * An array of Bitstream Format of this Bitstream
   */
-  format: RemoteData<BitstreamFormat>;
+  format: Observable<RemoteData<BitstreamFormat>>;

  /**
   * An array of Items that are direct parents of this Bitstream
   */
-  parents: RemoteData<Item[]>;
+  parents: Observable<RemoteData<Item[]>>;

  /**
   * The Bundle that owns this Bitstream
   */
-  owner: RemoteData<Item>;
+  owner: Observable<RemoteData<Item>>;

  /**
   * The URL to retrieve this Bitstream's file
--- a/src/app/core/shared/bundle.model.ts
+++ b/src/app/core/shared/bundle.model.ts
@@ -2,23 +2,24 @@ import { DSpaceObject } from './dspace-object.model';
 import { Bitstream } from './bitstream.model';
 import { Item } from './item.model';
 import { RemoteData } from '../data/remote-data';
+import { Observable } from 'rxjs/Observable';

 export class Bundle extends DSpaceObject {
  /**
   * The primary bitstream of this Bundle
   */
-  primaryBitstream: RemoteData<Bitstream>;
+  primaryBitstream: Observable<RemoteData<Bitstream>>;

  /**
   * An array of Items that are direct parents of this Bundle
   */
-  parents: RemoteData<Item[]>;
+  parents: Observable<RemoteData<Item[]>>;

  /**
   * The Item that owns this Bundle
   */
-  owner: RemoteData<Item>;
+  owner: Observable<RemoteData<Item>>;

-  bitstreams: RemoteData<Bitstream[]>
+  bitstreams: Observable<RemoteData<Bitstream[]>>

 }
--- a/src/app/core/shared/collection.model.ts
+++ b/src/app/core/shared/collection.model.ts
@@ -2,6 +2,7 @@ import { DSpaceObject } from './dspace-object.model';
 import { Bitstream } from './bitstream.model';
 import { Item } from './item.model';
 import { RemoteData } from '../data/remote-data';
+import { Observable } from 'rxjs/Observable';

 export class Collection extends DSpaceObject {

@@ -53,18 +54,18 @@ export class Collection extends DSpaceObject {
  /**
   * The Bitstream that represents the logo of this Collection
   */
-  logo: RemoteData<Bitstream>;
+  logo: Observable<RemoteData<Bitstream>>;

  /**
   * An array of Collections that are direct parents of this Collection
   */
-  parents: RemoteData<Collection[]>;
+  parents: Observable<RemoteData<Collection[]>>;

  /**
   * The Collection that owns this Collection
   */
-  owner: RemoteData<Collection>;
+  owner: Observable<RemoteData<Collection>>;

-  items: RemoteData<Item[]>;
+  items: Observable<RemoteData<Item[]>>;

 }
--- a/src/app/core/shared/community.model.ts
+++ b/src/app/core/shared/community.model.ts
@@ -2,6 +2,7 @@ import { DSpaceObject } from './dspace-object.model';
 import { Bitstream } from './bitstream.model';
 import { Collection } from './collection.model';
 import { RemoteData } from '../data/remote-data';
+import { Observable } from 'rxjs/Observable';

 export class Community extends DSpaceObject {

@@ -45,18 +46,18 @@ export class Community extends DSpaceObject {
  /**
   * The Bitstream that represents the logo of this Community
   */
-  logo: RemoteData<Bitstream>;
+  logo: Observable<RemoteData<Bitstream>>;

  /**
   * An array of Communities that are direct parents of this Community
   */
-  parents: RemoteData<DSpaceObject[]>;
+  parents: Observable<RemoteData<DSpaceObject[]>>;

  /**
   * The Community that owns this Community
   */
-  owner: RemoteData<Community>;
+  owner: Observable<RemoteData<Community>>;

-  collections: RemoteData<Collection[]>;
+  collections: Observable<RemoteData<Collection[]>>;

 }
--- a/src/app/core/shared/dspace-object.model.ts
+++ b/src/app/core/shared/dspace-object.model.ts
@@ -4,6 +4,7 @@ import { CacheableObject } from '../cache/object-cache.reducer';
 import { RemoteData } from '../data/remote-data';
 import { ResourceType } from './resource-type';
 import { ListableObject } from '../../object-list/listable-object/listable-object.model';
+import { Observable } from 'rxjs/Observable';

 /**
 * An abstract model class for a DSpaceObject.
@@ -40,12 +41,12 @@ export abstract class DSpaceObject implements CacheableObject, ListableObject {
  /**
   * An array of DSpaceObjects that are direct parents of this DSpaceObject
   */
-  parents: RemoteData<DSpaceObject[]>;
+  parents: Observable<RemoteData<DSpaceObject[]>>;

  /**
   * The DSpaceObject that owns this DSpaceObject
   */
-  owner: RemoteData<DSpaceObject>;
+  owner: Observable<RemoteData<DSpaceObject>>;

  /**
   * Find a metadata field by key and language
--- a/src/app/core/shared/hal-endpoint.service.spec.ts
+++ b/src/app/core/shared/hal-endpoint.service.spec.ts
@@ -51,13 +51,10 @@ describe('HALEndpointService', () => {
      );
    });

-    it('should configure a new RootEndpointRequest', (done) => {
+    it('should configure a new RootEndpointRequest', () => {
      (service as any).getEndpointMap();
      const expected = new RootEndpointRequest(envConfig);
-      setTimeout(() => {
      expect(requestService.configure).toHaveBeenCalledWith(expected);
-        done();
-      }, 0);
    });

    it('should return an Observable of the endpoint map', () => {
--- a/src/app/core/shared/hal-endpoint.service.ts
+++ b/src/app/core/shared/hal-endpoint.service.ts
@@ -15,10 +15,9 @@ export abstract class HALEndpointService {

  protected getEndpointMap(): Observable<EndpointMap> {
    const request = new RootEndpointRequest(this.EnvConfig);
-    setTimeout(() => {
    this.requestService.configure(request);
-    }, 0);
    return this.responseCache.get(request.href)
+      // .do((entry: ResponseCacheEntry) => console.log('entry.response', entry.response))
      .map((entry: ResponseCacheEntry) => entry.response)
      .filter((response: RootSuccessResponse) => isNotEmpty(response) && isNotEmpty(response.endpointMap))
      .map((response: RootSuccessResponse) => response.endpointMap)
--- a/src/app/core/shared/item.model.spec.ts
+++ b/src/app/core/shared/item.model.spec.ts
@@ -103,23 +103,15 @@ describe('Item', () => {
 });

 function createRemoteDataObject(object: any) {
-  const self = Observable.of('');
-  const requestPending = Observable.of(false);
-  const responsePending = Observable.of(false);
-  const isSuccessful = Observable.of(true);
-  const errorMessage = Observable.of(undefined);
-  const statusCode = Observable.of('200');
-  const pageInfo = Observable.of(new PageInfo());
-  const payload = Observable.of(object);
-  return new RemoteData(
-    self,
-    requestPending,
-    responsePending,
-    isSuccessful,
-    errorMessage,
-    statusCode,
-    pageInfo,
-    payload
-  );
+  return Observable.of(new RemoteData(
+    '',
+    false,
+    false,
+    true,
+    undefined,
+    '200',
+    new PageInfo(),
+    object
+  ));

 }
--- a/src/app/core/shared/item.model.ts
+++ b/src/app/core/shared/item.model.ts
@@ -4,7 +4,7 @@ import { DSpaceObject } from './dspace-object.model';
 import { Collection } from './collection.model';
 import { RemoteData } from '../data/remote-data';
 import { Bitstream } from './bitstream.model';
-import { isNotEmpty } from '../../shared/empty.util';
+import { hasValue, isNotEmpty } from '../../shared/empty.util';

 export class Item extends DSpaceObject {

@@ -36,18 +36,18 @@ export class Item extends DSpaceObject {
  /**
   * An array of Collections that are direct parents of this Item
   */
-  parents: RemoteData<Collection[]>;
+  parents: Observable<RemoteData<Collection[]>>;

  /**
   * The Collection that owns this Item
   */
-  owningCollection: RemoteData<Collection>;
+  owningCollection: Observable<RemoteData<Collection>>;

-  get owner(): RemoteData<Collection> {
+  get owner(): Observable<RemoteData<Collection>> {
    return this.owningCollection;
  }

-  bitstreams: RemoteData<Bitstream[]>;
+  bitstreams: Observable<RemoteData<Bitstream[]>>;

  /**
   * Retrieves the thumbnail of this item
@@ -87,9 +87,14 @@ export class Item extends DSpaceObject {
   * @returns {Observable<Bitstream[]>} the bitstreams with the given bundleName
   */
  getBitstreamsByBundleName(bundleName: string): Observable<Bitstream[]> {
-    return this.bitstreams.payload.startWith([])
+    return this.bitstreams
+      .map((rd: RemoteData<Bitstream[]>) => rd.payload)
+      .filter((bitstreams: Bitstream[]) => hasValue(bitstreams))
+      .startWith([])
      .map((bitstreams) => {
-        return bitstreams.filter((bitstream) => bitstream.bundleName === bundleName)
+        return bitstreams
+          .filter((bitstream) => hasValue(bitstream))
+          .filter((bitstream) => bitstream.bundleName === bundleName)
      });
  }

--- a/src/app/object-list/object-list.component.html
+++ b/src/app/object-list/object-list.component.html
@@ -1,7 +1,7 @@
 <ds-pagination
  [paginationOptions]="config"
  [pageInfoState]="pageInfo"
-  [collectionSize]="(pageInfo | async)?.totalElements"
+  [collectionSize]="pageInfo?.totalElements"
  [sortOptions]="sortConfig"
  [hideGear]="hideGear"
  [hidePagerWhenSinglePage]="hidePagerWhenSinglePage"
@@ -10,11 +10,9 @@
  (sortDirectionChange)="onSortDirectionChange($event)"
  (sortFieldChange)="onSortDirectionChange($event)"
  (paginationChange)="onPaginationChange($event)">
-  <ul *ngIf="objects.hasSucceeded | async" @fadeIn> <!--class="list-unstyled"-->
-      <li *ngFor="let object of (objects.payload | async) | paginate: { itemsPerPage: (pageInfo | async)?.elementsPerPage, currentPage: (pageInfo | async)?.currentPage, totalItems: (pageInfo | async)?.totalElements }">
+  <ul *ngIf="objects?.hasSucceeded"> <!--class="list-unstyled"-->
+      <li *ngFor="let object of objects?.payload | paginate: { itemsPerPage: pageInfo?.elementsPerPage, currentPage: pageInfo?.currentPage, totalItems: pageInfo?.totalElements }">
          <ds-wrapper-list-element [object]="object"></ds-wrapper-list-element>
      </li>
  </ul>
-  <ds-error *ngIf="objects.hasFailed | async" message="{{'error.objects' | translate}}"></ds-error>
-  <ds-loading *ngIf="objects.isLoading | async" message="{{'loading.objects' | translate}}"></ds-loading>
 </ds-pagination>
--- a/src/app/object-list/object-list.component.ts
+++ b/src/app/object-list/object-list.component.ts
@@ -1,18 +1,12 @@
 import {
  ChangeDetectionStrategy,
-  ChangeDetectorRef,
  Component,
  EventEmitter,
  Input,
-  OnChanges,
-  OnInit,
  Output,
-  SimpleChanges,
  ViewEncapsulation
 } from '@angular/core';

-import { Observable } from 'rxjs/Observable';
-
 import { SortDirection, SortOptions } from '../core/cache/models/sort-options.model';

 import { RemoteData } from '../core/data/remote-data';
@@ -20,6 +14,7 @@ import { PageInfo } from '../core/shared/page-info.model';
 import { ListableObject } from '../object-list/listable-object/listable-object.model';

 import { fadeIn } from '../shared/animations/fade';
+import { hasValue } from '../shared/empty.util';

 import { PaginationComponentOptions } from '../shared/pagination/pagination-component-options.model';

@@ -31,14 +26,35 @@ import { PaginationComponentOptions } from '../shared/pagination/pagination-comp
  templateUrl: './object-list.component.html',
  animations: [fadeIn]
 })
-export class ObjectListComponent implements OnChanges, OnInit {
+export class ObjectListComponent {

-  @Input() objects: RemoteData<ListableObject[]>;
  @Input() config: PaginationComponentOptions;
  @Input() sortConfig: SortOptions;
  @Input() hideGear = false;
  @Input() hidePagerWhenSinglePage = true;
-  pageInfo: Observable<PageInfo>;
+  private _objects: RemoteData<ListableObject[]>;
+  pageInfo: PageInfo;
+  @Input() set objects(objects: RemoteData<ListableObject[]>) {
+    this._objects = objects;
+    if (hasValue(objects)) {
+      this.pageInfo = objects.pageInfo;
+    }
+  }
+  get objects() {
+    return this._objects;
+  }
+
+  /**
+   * An event fired when the page is changed.
+   * Event's payload equals to the newly selected page.
+   */
+  @Output() change: EventEmitter<{
+    pagination: PaginationComponentOptions,
+    sort: SortOptions
+  }> = new EventEmitter<{
+    pagination: PaginationComponentOptions,
+    sort: SortOptions
+  }>();

  /**
   * An event fired when the page is changed.
@@ -67,26 +83,6 @@ export class ObjectListComponent implements OnChanges, OnInit {
  @Output() sortFieldChange: EventEmitter<string> = new EventEmitter<string>();
  data: any = {};

-  ngOnChanges(changes: SimpleChanges) {
-    if (changes.objects && !changes.objects.isFirstChange()) {
-      this.pageInfo = this.objects.pageInfo;
-    }
-  }
-
-  ngOnInit(): void {
-    this.pageInfo = this.objects.pageInfo;
-  }
-
-  /**
-   * @param route
-   *    Route is a singleton service provided by Angular.
-   * @param router
-   *    Router is a singleton service provided by Angular.
-   */
-  constructor(
-    private cdRef: ChangeDetectorRef) {
-  }
-
  onPageChange(event) {
    this.pageChange.emit(event);
  }
--- a/src/app/pagenotfound/pagenotfound.component.ts
+++ b/src/app/pagenotfound/pagenotfound.component.ts
@@ -5,7 +5,7 @@ import { Component, ChangeDetectionStrategy } from '@angular/core';
  selector: 'ds-pagenotfound',
  styleUrls: ['./pagenotfound.component.scss'],
  templateUrl: './pagenotfound.component.html',
-  changeDetection: ChangeDetectionStrategy.OnPush
+  changeDetection: ChangeDetectionStrategy.Default
 })
 export class PageNotFoundComponent {
  constructor(responseService: ServerResponseService) {
--- a/src/app/shared/mocks/mock-item.ts
+++ b/src/app/shared/mocks/mock-item.ts
@@ -9,61 +9,27 @@ export const MockItem: Item = Object.assign(new Item(), {
  isArchived: true,
  isDiscoverable: true,
  isWithdrawn: false,
-  bitstreams: {
-    self: {
-      _isScalar: true,
-      value: '1507836003548',
-      scheduler: null
-    },
-    requestPending: Observable.create((observer) => {
-      observer.next(false);
-    }),
-    responsePending: Observable.create((observer) => {
-      observer.next(false);
-    }),
-    isSuccessFul: Observable.create((observer) => {
-      observer.next(true);
-    }),
-    errorMessage: Observable.create((observer) => {
-      observer.next('');
-    }),
-    statusCode: Observable.create((observer) => {
-      observer.next(202);
-    }),
-    pageInfo: Observable.create((observer) => {
-      observer.next({});
-    }),
-    payload: Observable.create((observer) => {
-      observer.next([
+  bitstreams: Observable.of({
+    self: 'dspace-angular://aggregated/object/1507836003548',
+    requestPending: false,
+    responsePending: false,
+    isSuccessFul: true,
+    errorMessage: '',
+    statusCode: '202',
+    pageInfo: {},
+    payload: [
      {
        sizeBytes: 10201,
        content: 'https://dspace7.4science.it/dspace-spring-rest/api/core/bitstreams/cf9b0c8e-a1eb-4b65-afd0-567366448713/content',
-          format: {
-            self: {
-              _isScalar: true,
-              value: 'https://dspace7.4science.it/dspace-spring-rest/api/core/bitstreamformats/10',
-              scheduler: null
-            },
-            requestPending: Observable.create((observer) => {
-              observer.next(false);
-            }),
-            responsePending: Observable.create((observer) => {
-              observer.next(false);
-            }),
-            isSuccessFul: Observable.create((observer) => {
-              observer.next(true);
-            }),
-            errorMessage: Observable.create((observer) => {
-              observer.next('');
-            }),
-            statusCode: Observable.create((observer) => {
-              observer.next(202);
-            }),
-            pageInfo: Observable.create((observer) => {
-              observer.next({});
-            }),
-            payload: Observable.create((observer) => {
-              observer.next({
+        format: Observable.of({
+          self: 'https://dspace7.4science.it/dspace-spring-rest/api/core/bitstreamformats/10',
+          requestPending: false,
+          responsePending: false,
+          isSuccessFul: true,
+          errorMessage: '',
+          statusCode: '202',
+          pageInfo: {},
+          payload: {
            shortDescription: 'Microsoft Word XML',
            description: 'Microsoft Word XML',
            mimetype: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
@@ -71,9 +37,8 @@ export const MockItem: Item = Object.assign(new Item(), {
            internal: false,
            extensions: null,
            self: 'https://dspace7.4science.it/dspace-spring-rest/api/core/bitstreamformats/10'
-              });
-            })
-          },
+          }
+        }),
        bundleName: 'ORIGINAL',
        self: 'https://dspace7.4science.it/dspace-spring-rest/api/core/bitstreams/cf9b0c8e-a1eb-4b65-afd0-567366448713',
        id: 'cf9b0c8e-a1eb-4b65-afd0-567366448713',
@@ -91,32 +56,15 @@ export const MockItem: Item = Object.assign(new Item(), {
      {
        sizeBytes: 31302,
        content: 'https://dspace7.4science.it/dspace-spring-rest/api/core/bitstreams/99b00f3c-1cc6-4689-8158-91965bee6b28/content',
-          format: {
-            self: {
-              _isScalar: true,
-              value: 'https://dspace7.4science.it/dspace-spring-rest/api/core/bitstreamformats/4',
-              scheduler: null
-            },
-            requestPending: Observable.create((observer) => {
-              observer.next(false);
-            }),
-            responsePending: Observable.create((observer) => {
-              observer.next(false);
-            }),
-            isSuccessFul: Observable.create((observer) => {
-              observer.next(true);
-            }),
-            errorMessage: Observable.create((observer) => {
-              observer.next('');
-            }),
-            statusCode: Observable.create((observer) => {
-              observer.next(202);
-            }),
-            pageInfo: Observable.create((observer) => {
-              observer.next({});
-            }),
-            payload: Observable.create((observer) => {
-              observer.next({
+        format: Observable.of({
+          self: 'https://dspace7.4science.it/dspace-spring-rest/api/core/bitstreamformats/4',
+          requestPending: false,
+          responsePending: false,
+          isSuccessFul: true,
+          errorMessage: '',
+          statusCode: '202',
+          pageInfo: {},
+          payload: {
            shortDescription: 'Adobe PDF',
            description: 'Adobe Portable Document Format',
            mimetype: 'application/pdf',
@@ -124,9 +72,8 @@ export const MockItem: Item = Object.assign(new Item(), {
            internal: false,
            extensions: null,
            self: 'https://dspace7.4science.it/dspace-spring-rest/api/core/bitstreamformats/4'
-              });
-            })
-          },
+          }
+        }),
        bundleName: 'ORIGINAL',
        self: 'https://dspace7.4science.it/dspace-spring-rest/api/core/bitstreams/99b00f3c-1cc6-4689-8158-91965bee6b28',
        id: '99b00f3c-1cc6-4689-8158-91965bee6b28',
@@ -141,9 +88,8 @@ export const MockItem: Item = Object.assign(new Item(), {
          }
        ]
      }
-      ]);
-    })
-  },
+    ]
+  }),
  self: 'https://dspace7.4science.it/dspace-spring-rest/api/core/items/0ec7ff22-f211-40ab-a69e-c819b0b1f357',
  id: '0ec7ff22-f211-40ab-a69e-c819b0b1f357',
  uuid: '0ec7ff22-f211-40ab-a69e-c819b0b1f357',
@@ -241,33 +187,15 @@ export const MockItem: Item = Object.assign(new Item(), {
      value: 'text'
    }
  ],
-  owningCollection: {
-    self: {
-      _isScalar: true,
-      value: 'https://dspace7.4science.it/dspace-spring-rest/api/core/collections/1c11f3f1-ba1f-4f36-908a-3f1ea9a557eb',
-      scheduler: null
-    },
-    requestPending: Observable.create((observer) => {
-      observer.next(false);
-    }),
-    responsePending: Observable.create((observer) => {
-      observer.next(false);
-    }),
-    isSuccessFul: Observable.create((observer) => {
-      observer.next(true);
-    }),
-    errorMessage: Observable.create((observer) => {
-      observer.next('');
-    }),
-    statusCode: Observable.create((observer) => {
-      observer.next(202);
-    }),
-    pageInfo: Observable.create((observer) => {
-      observer.next({});
-    }),
-    payload: Observable.create((observer) => {
-      observer.next([]);
-    })
+  owningCollection: Observable.of({
+      self: 'https://dspace7.4science.it/dspace-spring-rest/api/core/collections/1c11f3f1-ba1f-4f36-908a-3f1ea9a557eb',
+      requestPending: false,
+      responsePending: false,
+      isSuccessFul: true,
+      errorMessage: '',
+      statusCode: '202',
+      pageInfo: {},
+      payload: []
    }
-})
+  )});
 /* tslint:enable:no-shadowed-variable */
--- a/src/app/shared/search-form/search-form.component.html
+++ b/src/app/shared/search-form/search-form.component.html
@@ -1,11 +1,11 @@
 <form #form="ngForm" (ngSubmit)="onSubmit(form.value)" class="row">
-<div *ngIf="isNotEmpty(scopes | async)" class="col-12 col-sm-3">
+<div *ngIf="isNotEmpty(scopes)" class="col-12 col-sm-3">
  <select [(ngModel)]="selectedId" name="scope" class="form-control" aria-label="Search scope" [compareWith]="byId">
    <option value>{{'search.form.search_dspace' | translate}}</option>
-    <option *ngFor="let scopeOption of scopes | async" [value]="scopeOption.id">{{scopeOption?.name ? scopeOption.name : 'search.form.search_dspace' | translate}}</option>
+    <option *ngFor="let scopeOption of scopes" [value]="scopeOption.id">{{scopeOption?.name ? scopeOption.name : 'search.form.search_dspace' | translate}}</option>
  </select>
 </div>
-    <div [ngClass]="{'col-sm-9': isNotEmpty(scopes | async)}" class="col-12">
+    <div [ngClass]="{'col-sm-9': isNotEmpty(scopes)}" class="col-12">
    <div class="form-group input-group">
        <input type="text" [(ngModel)]="query" name="query" class="form-control" aria-label="Search input">
        <span class="input-group-btn">
--- a/src/app/shared/search-form/search-form.component.spec.ts
+++ b/src/app/shared/search-form/search-form.component.spec.ts
@@ -8,6 +8,7 @@ import { ResourceType } from '../../core/shared/resource-type';
 import { RouterTestingModule } from '@angular/router/testing';
 import { Community } from '../../core/shared/community.model';
 import { TranslateModule } from '@ngx-translate/core';
+import { DSpaceObject } from '../../core/shared/dspace-object.model';

 describe('SearchFormComponent', () => {
  let comp: SearchFormComponent;
@@ -30,7 +31,7 @@ describe('SearchFormComponent', () => {
  });

  it('should display scopes when available with default and all scopes', () => {
-    comp.scopes = Observable.of(objects);
+    comp.scopes = objects;
    fixture.detectChanges();
    const select: HTMLElement = de.query(By.css('select')).nativeElement;
    expect(select).toBeDefined();
@@ -64,7 +65,7 @@ describe('SearchFormComponent', () => {
  }));

  it('should select correct scope option in scope select', fakeAsync(() => {
-    comp.scopes = Observable.of(objects);
+    comp.scopes = objects;
    fixture.detectChanges();

    const testCommunity = objects[1];
@@ -100,7 +101,7 @@ describe('SearchFormComponent', () => {
  // }));
 });

-export const objects = [
+export const objects: DSpaceObject[] = [
  Object.assign(new Community(), {
    handle: '10673/11',
    logo: {
--- a/src/app/shared/search-form/search-form.component.ts
+++ b/src/app/shared/search-form/search-form.component.ts
@@ -20,7 +20,7 @@ export class SearchFormComponent {
  selectedId = '';
  // Optional existing search parameters
  @Input() currentParams: {};
-  @Input() scopes: Observable<DSpaceObject[]>;
+  @Input() scopes: DSpaceObject[];

  @Input()
  set scope(dso: DSpaceObject) {