Fixed conflicts with new metadata map

src/app/+item-page/edit-item-page/item-metadata/edit-in-place-field/edit-in-place-field.component.spec.ts

@@ -8,7 +8,6 @@ import { RemoteData } from '../../../../core/data/remote-data';
 import { PaginatedList } from '../../../../core/data/paginated-list';
 import { MetadataField } from '../../../../core/metadata/metadatafield.model';
 import { By } from '@angular/platform-browser';
-import { Metadatum } from '../../../../core/shared/metadatum.model';
 import { FormsModule } from '@angular/forms';
 import { SharedModule } from '../../../../shared/shared.module';
 import { getTestScheduler } from 'jasmine-marbles';
@@ -17,6 +16,7 @@ import { TestScheduler } from 'rxjs/testing';
 import { MetadataSchema } from '../../../../core/metadata/metadataschema.model';
 import { FieldChangeType } from '../../../../core/data/object-updates/object-updates.actions';
 import { TranslateModule } from '@ngx-translate/core';
+import { MetadatumViewModel } from '../../../../core/shared/metadata.models';
 
 let comp: EditInPlaceFieldComponent;
 let fixture: ComponentFixture<EditInPlaceFieldComponent>;
@@ -38,7 +38,7 @@ const mdField3 = Object.assign(new MetadataField(), {
   qualifier: 'abstract'
 });
 
-const metadatum = Object.assign(new Metadatum(), {
+const metadatum = Object.assign(new MetadatumViewModel(), {
   key: 'dc.description.abstract',
   value: 'Example abstract',
   language: 'en'

src/app/+item-page/edit-item-page/item-metadata/edit-in-place-field/edit-in-place-field.component.ts

@@ -1,6 +1,5 @@
 import { Component, Input, OnChanges, OnInit } from '@angular/core';
 import { hasValue, isNotEmpty } from '../../../../shared/empty.util';
-import { Metadatum } from '../../../../core/shared/metadatum.model';
 import { RegistryService } from '../../../../core/registry/registry.service';
 import { cloneDeep } from 'lodash';
 import { BehaviorSubject, Observable, of as observableOf } from 'rxjs';
@@ -10,8 +9,8 @@ import { InputSuggestion } from '../../../../shared/input-suggestions/input-sugg
 import { FieldChangeType } from '../../../../core/data/object-updates/object-updates.actions';
 import { FieldUpdate } from '../../../../core/data/object-updates/object-updates.reducer';
 import { ObjectUpdatesService } from '../../../../core/data/object-updates/object-updates.service';
-import { getSucceededRemoteData } from '../../../../core/shared/operators';
 import { NgModel } from '@angular/forms';
+import { MetadatumViewModel } from '../../../../core/shared/metadata.models';
 
 @Component({
   // tslint:disable-next-line:component-selector
@@ -41,7 +40,7 @@ export class EditInPlaceFieldComponent implements OnInit, OnChanges {
   /**
    * The metadatum of this field
    */
-  metadata: Metadatum;
+  metadata: MetadatumViewModel;
 
   /**
    * Emits whether or not this field is currently editable
@@ -118,7 +117,7 @@ export class EditInPlaceFieldComponent implements OnInit, OnChanges {
    * Sets the current metadatafield based on the fieldUpdate input field
    */
   ngOnChanges(): void {
-    this.metadata = cloneDeep(this.fieldUpdate.field) as Metadatum;
+    this.metadata = cloneDeep(this.fieldUpdate.field) as MetadatumViewModel;
   }
 
   /**

src/app/+item-page/edit-item-page/item-metadata/item-metadata.component.spec.ts

@@ -3,7 +3,6 @@ import { CUSTOM_ELEMENTS_SCHEMA, DebugElement, NO_ERRORS_SCHEMA } from '@angular
 import { of as observableOf } from 'rxjs';
 import { getTestScheduler } from 'jasmine-marbles';
 import { ItemMetadataComponent } from './item-metadata.component';
-import { Metadatum } from '../../../core/shared/metadatum.model';
 import { TestScheduler } from 'rxjs/testing';
 import { SharedModule } from '../../../shared/shared.module';
 import { ObjectUpdatesService } from '../../../core/data/object-updates/object-updates.service';
@@ -22,6 +21,7 @@ import { GLOBAL_CONFIG } from '../../../../config';
 import { Item } from '../../../core/shared/item.model';
 import { FieldChangeType } from '../../../core/data/object-updates/object-updates.actions';
 import { RemoteData } from '../../../core/data/remote-data';
+import { MetadatumViewModel } from '../../../core/shared/metadata.models';
 
 let comp: ItemMetadataComponent;
 let fixture: ComponentFixture<ItemMetadataComponent>;
@@ -43,19 +43,19 @@ const notificationsService = jasmine.createSpyObj('notificationsService',
     success: successNotification
   }
 );
-const metadatum1 = Object.assign(new Metadatum(), {
+const metadatum1 = Object.assign(new MetadatumViewModel(), {
   key: 'dc.description.abstract',
   value: 'Example abstract',
   language: 'en'
 });
 
-const metadatum2 = Object.assign(new Metadatum(), {
+const metadatum2 = Object.assign(new MetadatumViewModel(), {
   key: 'dc.title',
   value: 'Title test',
   language: 'de'
 });
 
-const metadatum3 = Object.assign(new Metadatum(), {
+const metadatum3 = Object.assign(new MetadatumViewModel(), {
   key: 'dc.contributor.author',
   value: 'Shakespeare, William',
 });
@@ -140,7 +140,7 @@ describe('ItemMetadataComponent', () => {
   });
 
   describe('add', () => {
-    const md = new Metadatum();
+    const md = new MetadatumViewModel();
     beforeEach(() => {
       comp.add(md);
     });

src/app/+item-page/edit-item-page/item-metadata/item-metadata.component.ts

@@ -10,7 +10,6 @@ import {
   FieldUpdates,
   Identifiable
 } from '../../../core/data/object-updates/object-updates.reducer';
-import { Metadatum } from '../../../core/shared/metadatum.model';
 import { first, map, switchMap, take, tap } from 'rxjs/operators';
 import { getSucceededRemoteData } from '../../../core/shared/operators';
 import { RemoteData } from '../../../core/data/remote-data';
@@ -19,6 +18,8 @@ import { GLOBAL_CONFIG, GlobalConfig } from '../../../../config';
 import { TranslateService } from '@ngx-translate/core';
 import { RegistryService } from '../../../core/registry/registry.service';
 import { MetadataField } from '../../../core/metadata/metadatafield.model';
+import { MetadatumViewModel } from '../../../core/shared/metadata.models';
+import { Metadata } from '../../../core/shared/metadata.utils';
 
 @Component({
   selector: 'ds-item-metadata',
@@ -92,14 +93,14 @@ export class ItemMetadataComponent implements OnInit {
         this.checkLastModified();
       }
     });
-    this.updates$ = this.objectUpdatesService.getFieldUpdates(this.url, this.item.metadata);
+    this.updates$ = this.objectUpdatesService.getFieldUpdates(this.url, this.item.metadataAsList);
   }
 
   /**
    * Sends a new add update for a field to the object updates service
    * @param metadata The metadata to add, if no parameter is supplied, create a new Metadatum
    */
-  add(metadata: Metadatum = new Metadatum()) {
+  add(metadata: MetadatumViewModel = new MetadatumViewModel()) {
     this.objectUpdatesService.saveAddFieldUpdate(this.url, metadata);
 
   }
@@ -124,7 +125,7 @@ export class ItemMetadataComponent implements OnInit {
    * Sends all initial values of this item to the object updates service
    */
   private initializeOriginalFields() {
-    this.objectUpdatesService.initialize(this.url, this.item.metadata, this.item.lastModified);
+    this.objectUpdatesService.initialize(this.url, this.item.metadataAsList, this.item.lastModified);
   }
 
   /**
@@ -141,11 +142,11 @@ export class ItemMetadataComponent implements OnInit {
   submit() {
     this.isValid().pipe(first()).subscribe((isValid) => {
       if (isValid) {
-        const metadata$: Observable<Identifiable[]> = this.objectUpdatesService.getUpdatedFields(this.url, this.item.metadata) as Observable<Metadatum[]>;
+        const metadata$: Observable<Identifiable[]> = this.objectUpdatesService.getUpdatedFields(this.url, this.item.metadataAsList) as Observable<MetadatumViewModel[]>;
         metadata$.pipe(
           first(),
-          switchMap((metadata: Metadatum[]) => {
+          switchMap((metadata: MetadatumViewModel[]) => {
-            const updatedItem: Item = Object.assign(cloneDeep(this.item), { metadata });
+            const updatedItem: Item = Object.assign(cloneDeep(this.item), { metadata: Metadata.toMetadataMap(metadata) });
             return this.itemService.update(updatedItem);
           }),
           tap(() => this.itemService.commitUpdates()),
@@ -154,7 +155,7 @@ export class ItemMetadataComponent implements OnInit {
           (rd: RemoteData<Item>) => {
             this.item = rd.payload;
             this.initializeOriginalFields();
-            this.updates$ = this.objectUpdatesService.getFieldUpdates(this.url, this.item.metadata);
+            this.updates$ = this.objectUpdatesService.getFieldUpdates(this.url, this.item.metadataAsList);
             this.notificationsService.success(this.getNotificationTitle('saved'), this.getNotificationContent('saved'));
           }
         )

src/app/+item-page/edit-item-page/modify-item-overview/modify-item-overview.component.ts

@@ -1,6 +1,6 @@
 import {Component, Input, OnInit} from '@angular/core';
 import {Item} from '../../../core/shared/item.model';
-import {MetadataMap} from '../../../core/shared/metadata.interfaces';
+import {MetadataMap} from '../../../core/shared/metadata.models';
 
 @Component({
   selector: 'ds-modify-item-overview',

src/app/+item-page/field-components/metadata-uri-values/metadata-uri-values.component.ts

@@ -1,7 +1,7 @@
 import { Component, Input } from '@angular/core';
 
 import { MetadataValuesComponent } from '../metadata-values/metadata-values.component';
-import { MetadataValue } from '../../../core/shared/metadata.interfaces';
+import { MetadataValue } from '../../../core/shared/metadata.models';
 
 /**
  * This component renders the configured 'values' into the ds-metadata-field-wrapper component as a link.

src/app/+item-page/field-components/metadata-values/metadata-values.component.ts

@@ -1,5 +1,5 @@
 import { Component, Input } from '@angular/core';
-import { MetadataValue } from '../../../core/shared/metadata.interfaces';
+import { MetadataValue } from '../../../core/shared/metadata.models';
 
 /**
  * This component renders the configured 'values' into the ds-metadata-field-wrapper component.

src/app/+item-page/full/full-item-page.component.ts

@@ -6,7 +6,7 @@ import { ActivatedRoute } from '@angular/router';
 import { Observable } from 'rxjs';
 
 import { ItemPageComponent } from '../simple/item-page.component';
-import { MetadataMap } from '../../core/shared/metadata.interfaces';
+import { MetadataMap } from '../../core/shared/metadata.models';
 import { ItemDataService } from '../../core/data/item-data.service';
 
 import { RemoteData } from '../../core/data/remote-data';

src/app/+search-page/normalized-search-result.model.ts

@@ -1,5 +1,5 @@
 import { autoserialize } from 'cerialize';
-import { MetadataMap } from '../core/shared/metadata.interfaces';
+import { MetadataMap } from '../core/shared/metadata.models';
 import { ListableObject } from '../shared/object-collection/shared/listable-object.model';
 
 /**

src/app/+search-page/search-result.model.ts

@@ -1,5 +1,5 @@
 import { DSpaceObject } from '../core/shared/dspace-object.model';
-import { MetadataMap } from '../core/shared/metadata.interfaces';
+import { MetadataMap } from '../core/shared/metadata.models';
 import { ListableObject } from '../shared/object-collection/shared/listable-object.model';
 
 /**

src/app/core/cache/models/normalized-dspace-object.model.ts

@@ -1,6 +1,6 @@
-import { autoserialize, autoserializeAs, deserialize, serialize } from 'cerialize';
+import { autoserializeAs, deserializeAs } from 'cerialize';
 import { DSpaceObject } from '../../shared/dspace-object.model';
-import { MetadataMap } from '../../shared/metadata.interfaces';
+import { MetadataMap, MetadataMapSerializer } from '../../shared/metadata.models';
 import { ResourceType } from '../../shared/resource-type';
 import { mapsTo } from '../builders/build-decorators';
 import { NormalizedObject } from './normalized-object.model';
@@ -17,7 +17,7 @@ export class NormalizedDSpaceObject<T extends DSpaceObject> extends NormalizedOb
    * Repeated here to make the serialization work,
    * inheritSerialization doesn't seem to work for more than one level
    */
-  @deserialize
+  @deserializeAs(String)
   self: string;
 
   /**
@@ -35,31 +35,31 @@ export class NormalizedDSpaceObject<T extends DSpaceObject> extends NormalizedOb
    * Repeated here to make the serialization work,
    * inheritSerialization doesn't seem to work for more than one level
    */
-  @autoserialize
+  @autoserializeAs(String)
   uuid: string;
 
   /**
    * A string representing the kind of DSpaceObject, e.g. community, item, …
    */
-  @autoserialize
+  @autoserializeAs(String)
   type: ResourceType;
 
   /**
    * All metadata of this DSpaceObject
    */
-  @autoserialize
+  @autoserializeAs(MetadataMapSerializer)
   metadata: MetadataMap;
 
   /**
    * An array of DSpaceObjects that are direct parents of this DSpaceObject
    */
-  @deserialize
+  @deserializeAs(String)
   parents: string[];
 
   /**
    * The DSpaceObject that owns this DSpaceObject
    */
-  @deserialize
+  @deserializeAs(String)
   owner: string;
 
   /**
@@ -68,7 +68,7 @@ export class NormalizedDSpaceObject<T extends DSpaceObject> extends NormalizedOb
    * Repeated here to make the serialization work,
    * inheritSerialization doesn't seem to work for more than one level
    */
-  @deserialize
+  @deserializeAs(Object)
   _links: {
     [name: string]: string
   }

src/app/core/data/search-response-parsing.service.ts

@@ -7,7 +7,7 @@ import { DSpaceRESTV2Response } from '../dspace-rest-v2/dspace-rest-v2-response.
 import { DSpaceRESTv2Serializer } from '../dspace-rest-v2/dspace-rest-v2.serializer';
 import { hasValue } from '../../shared/empty.util';
 import { SearchQueryResponse } from '../../+search-page/search-service/search-query-response.model';
-import { MetadataMap, MetadataValue } from '../shared/metadata.interfaces';
+import { MetadataMap, MetadataValue } from '../shared/metadata.models';
 
 @Injectable()
 export class SearchResponseParsingService implements ResponseParsingService {
@@ -22,7 +22,7 @@ export class SearchResponseParsingService implements ResponseParsingService {
         const mdMap: MetadataMap = {};
         if (hhObject) {
           for (const key of Object.keys(hhObject)) {
-            const value: MetadataValue = { value: hhObject[key].join('...'), language: null };
+            const value: MetadataValue = Object.assign(new MetadataValue(), { value: hhObject[key].join('...'), language: null });
             mdMap[key] = [ value ];
           }
         }

src/app/core/eperson/models/eperson.model.ts

@@ -20,6 +20,6 @@ export class EPerson extends DSpaceObject {
   public selfRegistered: boolean;
 
   get name(): string {
-    return this.findMetadata('eperson.firstname') + ' ' + this.findMetadata('eperson.lastname');
+    return this.firstMetadataValue('eperson.firstname') + ' ' + this.firstMetadataValue('eperson.lastname');
   }
 }

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

@@ -37,7 +37,7 @@ import { HttpClient } from '@angular/common/http';
 import { EmptyError } from 'rxjs/internal-compatibility';
 import { NormalizedObjectBuildService } from '../cache/builders/normalized-object-build.service';
 import { DSOChangeAnalyzer } from '../data/dso-change-analyzer.service';
-import { MetadataValue } from '../shared/metadata.interfaces';
+import { MetadataValue } from '../shared/metadata.models';
 
 /* tslint:disable:max-classes-per-file */
 @Component({

src/app/core/shared/dspace-object.model.ts

@@ -1,11 +1,10 @@
-import { MetadataMap, MetadataValue, MetadataValueFilter } from './metadata.interfaces';
+import { MetadataMap, MetadataValue, MetadataValueFilter } from './metadata.models';
-import { Metadata } from './metadata.model';
+import { Metadata } from './metadata.utils';
 import { CacheableObject } from '../cache/object-cache.reducer';
 import { RemoteData } from '../data/remote-data';
 import { ResourceType } from './resource-type';
 import { ListableObject } from '../../shared/object-collection/shared/listable-object.model';
 import { Observable } from 'rxjs';
-import { autoserialize } from 'cerialize';
 
 /**
  * An abstract model class for a DSpaceObject.
@@ -17,13 +16,11 @@ export class DSpaceObject implements CacheableObject, ListableObject {
   /**
    * The human-readable identifier of this DSpaceObject
    */
-  @autoserialize
   id: string;
 
   /**
    * The universally unique identifier of this DSpaceObject
    */
-  @autoserialize
   uuid: string;
 
   /**
@@ -41,9 +38,12 @@ export class DSpaceObject implements CacheableObject, ListableObject {
   /**
    * All metadata of this DSpaceObject
    */
-  @autoserialize
   metadata: MetadataMap;
 
+  get metadataAsList() {
+    return Metadata.toViewModelList(this.metadata);
+  }
+
   /**
    * An array of DSpaceObjects that are direct parents of this DSpaceObject
    */

src/app/core/shared/metadata.interfaces.ts

@@ -1,30 +0,0 @@
-/** A map of metadata keys to an ordered list of MetadataValue objects. */
-export interface MetadataMap {
-  [ key: string ]: MetadataValue[];
-}
-
-/** A single metadata value and its properties. */
-export interface MetadataValue {
-
-  /** The language. */
-  language: string;
-
-  /** The string value. */
-  value: string;
-}
-
-/** Constraints for matching metadata values. */
-export interface MetadataValueFilter {
-
-  /** The language constraint. */
-  language?: string;
-
-  /** The value constraint. */
-  value?: string;
-
-  /** Whether the value constraint should match without regard to case. */
-  ignoreCase?: boolean;
-
-  /** Whether the value constraint should match as a substring. */
-  substring?: boolean;
-}

src/app/core/shared/metadata.model.spec.ts

@@ -1,10 +1,16 @@
 import { isUndefined } from '../../shared/empty.util';
-import { MetadataValue, MetadataValueFilter } from './metadata.interfaces';
+import * as uuidv4 from 'uuid/v4';
-import { Metadata } from './metadata.model';
+import {
+  MetadataMap,
+  MetadataValue,
+  MetadataValueFilter,
+  MetadatumViewModel
+} from './metadata.models';
+import { Metadata } from './metadata.utils';
 
 const mdValue = (value: string, language?: string): MetadataValue => {
-  return { value: value, language: isUndefined(language) ? null : language };
+  return { uuid: uuidv4(), value: value, language: isUndefined(language) ? null : language };
-}
+};
 
 const dcDescription = mdValue('Some description');
 const dcAbstract = mdValue('Some abstract');
@@ -13,19 +19,27 @@ const dcTitle1 = mdValue('Title 1');
 const dcTitle2 = mdValue('Title 2', 'en_US');
 const bar = mdValue('Bar');
 
-const singleMap = { 'dc.title': [ dcTitle0 ] };
+const singleMap = { 'dc.title': [dcTitle0] };
 
 const multiMap = {
-  'dc.description': [ dcDescription ],
+  'dc.description': [dcDescription],
-  'dc.description.abstract': [ dcAbstract ],
+  'dc.description.abstract': [dcAbstract],
-  'dc.title': [ dcTitle1, dcTitle2 ],
+  'dc.title': [dcTitle1, dcTitle2],
-  'foo': [ bar ]
+  'foo': [bar]
 };
 
+const multiViewModelList = [
+  { key: 'dc.description', ...dcDescription, order: 0 },
+  { key: 'dc.description.abstract', ...dcAbstract, order: 0 },
+  { key: 'dc.title', ...dcTitle1, order: 0 },
+  { key: 'dc.title', ...dcTitle2, order: 1 },
+  { key: 'foo', ...bar, order: 0 }
+];
+
 const testMethod = (fn, resultKind, mapOrMaps, keyOrKeys, expected, filter?) => {
-  const keys = keyOrKeys instanceof Array ? keyOrKeys : [ keyOrKeys ];
+  const keys = keyOrKeys instanceof Array ? keyOrKeys : [keyOrKeys];
   describe('and key' + (keys.length === 1 ? (' ' + keys[0]) : ('s ' + JSON.stringify(keys)))
-        + ' with ' + (isUndefined(filter) ? 'no filter' : 'filter ' + JSON.stringify(filter)), () => {
+    + ' with ' + (isUndefined(filter) ? 'no filter' : 'filter ' + JSON.stringify(filter)), () => {
     const result = fn(mapOrMaps, keys, filter);
     let shouldReturn;
     if (resultKind === 'boolean') {
@@ -34,7 +48,7 @@ const testMethod = (fn, resultKind, mapOrMaps, keyOrKeys, expected, filter?) =>
       shouldReturn = 'undefined';
     } else if (expected instanceof Array) {
       shouldReturn = 'an array with ' + expected.length + ' ' + (expected.length > 1 ? 'ordered ' : '')
-          + resultKind + (expected.length !== 1 ? 's' : '');
+        + resultKind + (expected.length !== 1 ? 's' : '');
     } else {
       shouldReturn = 'a ' + resultKind;
     }
@@ -57,30 +71,30 @@ describe('Metadata', () => {
     });
     describe('with singleMap', () => {
       testAll(singleMap, 'foo', []);
-      testAll(singleMap, '*', [ dcTitle0 ]);
+      testAll(singleMap, '*', [dcTitle0]);
       testAll(singleMap, '*', [], { value: 'baz' });
-      testAll(singleMap, 'dc.title', [ dcTitle0 ]);
+      testAll(singleMap, 'dc.title', [dcTitle0]);
-      testAll(singleMap, 'dc.*', [ dcTitle0 ]);
+      testAll(singleMap, 'dc.*', [dcTitle0]);
     });
     describe('with multiMap', () => {
-      testAll(multiMap, 'foo', [ bar ]);
+      testAll(multiMap, 'foo', [bar]);
-      testAll(multiMap, '*', [ dcDescription, dcAbstract, dcTitle1, dcTitle2, bar ]);
+      testAll(multiMap, '*', [dcDescription, dcAbstract, dcTitle1, dcTitle2, bar]);
-      testAll(multiMap, 'dc.title', [ dcTitle1, dcTitle2 ]);
+      testAll(multiMap, 'dc.title', [dcTitle1, dcTitle2]);
-      testAll(multiMap, 'dc.*', [ dcDescription, dcAbstract, dcTitle1, dcTitle2 ]);
+      testAll(multiMap, 'dc.*', [dcDescription, dcAbstract, dcTitle1, dcTitle2]);
-      testAll(multiMap, [ 'dc.title', 'dc.*' ], [ dcTitle1, dcTitle2, dcDescription, dcAbstract ]);
+      testAll(multiMap, ['dc.title', 'dc.*'], [dcTitle1, dcTitle2, dcDescription, dcAbstract]);
     });
     describe('with [ singleMap, multiMap ]', () => {
-      testAll([ singleMap, multiMap ], 'foo', [ bar ]);
+      testAll([singleMap, multiMap], 'foo', [bar]);
-      testAll([ singleMap, multiMap ], '*', [ dcTitle0 ]);
+      testAll([singleMap, multiMap], '*', [dcTitle0]);
-      testAll([ singleMap, multiMap ], 'dc.title', [ dcTitle0 ]);
+      testAll([singleMap, multiMap], 'dc.title', [dcTitle0]);
-      testAll([ singleMap, multiMap ], 'dc.*', [ dcTitle0 ]);
+      testAll([singleMap, multiMap], 'dc.*', [dcTitle0]);
     });
     describe('with [ multiMap, singleMap ]', () => {
-      testAll([ multiMap, singleMap ], 'foo', [ bar ]);
+      testAll([multiMap, singleMap], 'foo', [bar]);
-      testAll([ multiMap, singleMap ], '*', [ dcDescription, dcAbstract, dcTitle1, dcTitle2, bar ]);
+      testAll([multiMap, singleMap], '*', [dcDescription, dcAbstract, dcTitle1, dcTitle2, bar]);
-      testAll([ multiMap, singleMap ], 'dc.title', [ dcTitle1, dcTitle2 ]);
+      testAll([multiMap, singleMap], 'dc.title', [dcTitle1, dcTitle2]);
-      testAll([ multiMap, singleMap ], 'dc.*', [ dcDescription, dcAbstract, dcTitle1, dcTitle2 ]);
+      testAll([multiMap, singleMap], 'dc.*', [dcDescription, dcAbstract, dcTitle1, dcTitle2]);
-      testAll([ multiMap, singleMap ], [ 'dc.title', 'dc.*' ], [ dcTitle1, dcTitle2, dcDescription, dcAbstract ]);
+      testAll([multiMap, singleMap], ['dc.title', 'dc.*'], [dcTitle1, dcTitle2, dcDescription, dcAbstract]);
     });
   });
 
@@ -93,10 +107,10 @@ describe('Metadata', () => {
       testAllValues({}, '*', []);
     });
     describe('with singleMap', () => {
-      testAllValues([ singleMap, multiMap ], '*', [ dcTitle0.value ]);
+      testAllValues([singleMap, multiMap], '*', [dcTitle0.value]);
     });
     describe('with [ multiMap, singleMap ]', () => {
-      testAllValues([ multiMap, singleMap ], '*', [ dcDescription.value, dcAbstract.value, dcTitle1.value, dcTitle2.value, bar.value ]);
+      testAllValues([multiMap, singleMap], '*', [dcDescription.value, dcAbstract.value, dcTitle1.value, dcTitle2.value, bar.value]);
     });
   });
 
@@ -112,7 +126,7 @@ describe('Metadata', () => {
       testFirst(singleMap, '*', dcTitle0);
     });
     describe('with [ multiMap, singleMap ]', () => {
-      testFirst([ multiMap, singleMap ], '*', dcDescription);
+      testFirst([multiMap, singleMap], '*', dcDescription);
     });
   });
 
@@ -128,7 +142,7 @@ describe('Metadata', () => {
       testFirstValue(singleMap, '*', dcTitle0.value);
     });
     describe('with [ multiMap, singleMap ]', () => {
-      testFirstValue([ multiMap, singleMap ], '*', dcDescription.value);
+      testFirstValue([multiMap, singleMap], '*', dcDescription.value);
     });
   });
 
@@ -145,7 +159,7 @@ describe('Metadata', () => {
       testHas(singleMap, '*', false, { value: 'baz' });
     });
     describe('with [ multiMap, singleMap ]', () => {
-      testHas([ multiMap, singleMap ], '*', true);
+      testHas([multiMap, singleMap], '*', true);
     });
   });
 
@@ -153,7 +167,7 @@ describe('Metadata', () => {
 
     const testValueMatches = (value: MetadataValue, expected: boolean, filter?: MetadataValueFilter) => {
       describe('with value ' + JSON.stringify(value) + ' and filter '
-          + (isUndefined(filter) ? 'undefined' : JSON.stringify(filter)), () => {
+        + (isUndefined(filter) ? 'undefined' : JSON.stringify(filter)), () => {
         const result = Metadata.valueMatches(value, filter);
         it('should return ' + expected, () => {
           expect(result).toEqual(expected);
@@ -172,4 +186,32 @@ describe('Metadata', () => {
     testValueMatches(mdValue('a', 'en_US'), true, { language: 'en_US' });
   });
 
+  describe('toViewModelList method', () => {
+
+    const testToViewModelList = (map: MetadataMap, expected: MetadatumViewModel[]) => {
+      describe('with map ' + JSON.stringify(map), () => {
+        const result = Metadata.toViewModelList(map);
+        it('should return ' + JSON.stringify(expected), () => {
+          expect(result).toEqual(expected);
+        });
+      });
+    };
+
+    testToViewModelList(multiMap, multiViewModelList);
+  });
+
+  describe('toMetadataMap method', () => {
+
+    const testToMetadataMap = (metadatumList: MetadatumViewModel[], expected: MetadataMap) => {
+      describe('with metadatum list ' + JSON.stringify(metadatumList), () => {
+        const result = Metadata.toMetadataMap(metadatumList);
+        it('should return ' + JSON.stringify(expected), () => {
+          expect(result).toEqual(expected);
+        });
+      });
+    };
+
+    testToMetadataMap(multiViewModelList, multiMap);
+  });
+
 });

src/app/core/shared/metadata.models.ts

@@ -0,0 +1,75 @@
+import * as uuidv4 from 'uuid/v4';
+import { autoserialize, Serialize, Deserialize } from 'cerialize';
+
+/** A map of metadata keys to an ordered list of MetadataValue objects. */
+export class MetadataMap {
+  [key: string]: MetadataValue[];
+}
+
+/** A single metadata value and its properties. */
+
+export class MetadataValue {
+
+  /** The uuid. */
+  uuid: string = uuidv4();
+
+  /** The language. */
+  @autoserialize
+  language: string;
+
+  /** The string value. */
+  @autoserialize
+  value: string;
+
+}
+
+/** Constraints for matching metadata values. */
+export interface MetadataValueFilter {
+  /** The language constraint. */
+  language?: string;
+
+  /** The value constraint. */
+  value?: string;
+
+  /** Whether the value constraint should match without regard to case. */
+  ignoreCase?: boolean;
+
+  /** Whether the value constraint should match as a substring. */
+  substring?: boolean;
+}
+
+export class MetadatumViewModel {
+  /** The uuid. */
+  uuid: string = uuidv4();
+
+  /** The metadatafield key. */
+  key: string;
+
+  /** The language. */
+  language: string;
+
+  /** The string value. */
+  value: string;
+
+  /** The order. */
+  order: number;
+}
+
+
+export const MetadataMapSerializer = {
+  Serialize(map: MetadataMap): any {
+    const json = {};
+    Object.keys(map).forEach((key: string) => {
+      json[key] = Serialize(map[key], MetadataValue);
+    });
+    return json;
+  },
+
+  Deserialize(json: any): MetadataMap {
+    const metadataMap: MetadataMap = {};
+    Object.keys(json).forEach((key: string) => {
+      metadataMap[key] = Deserialize(json[key], MetadataValue);
+    });
+    return metadataMap;
+  }
+};

src/app/core/shared/metadata.utils.ts

@@ -1,5 +1,11 @@
 import { isEmpty, isNotUndefined, isUndefined } from '../../shared/empty.util';
-import { MetadataMap, MetadataValue, MetadataValueFilter } from './metadata.interfaces';
+import {
+  MetadataMap,
+  MetadataValue,
+  MetadataValueFilter,
+  MetadatumViewModel
+} from './metadata.models';
+import { groupBy, sortBy } from 'lodash';
 
 /**
  * Utility class for working with DSpace object metadata.
@@ -27,7 +33,7 @@ export class Metadata {
    */
   public static all(mapOrMaps: MetadataMap | MetadataMap[], keyOrKeys: string | string[],
                     filter?: MetadataValueFilter): MetadataValue[] {
-    const mdMaps: MetadataMap[] = mapOrMaps instanceof Array ? mapOrMaps : [ mapOrMaps ];
+    const mdMaps: MetadataMap[] = mapOrMaps instanceof Array ? mapOrMaps : [mapOrMaps];
     const matches: MetadataValue[] = [];
     for (const mdMap of mdMaps) {
       for (const mdKey of Metadata.resolveKeys(mdMap, keyOrKeys)) {
@@ -71,7 +77,7 @@ export class Metadata {
    */
   public static first(mdMapOrMaps: MetadataMap | MetadataMap[], keyOrKeys: string | string[],
                       filter?: MetadataValueFilter): MetadataValue {
-    const mdMaps: MetadataMap[] = mdMapOrMaps instanceof Array ? mdMapOrMaps : [ mdMapOrMaps ];
+    const mdMaps: MetadataMap[] = mdMapOrMaps instanceof Array ? mdMapOrMaps : [mdMapOrMaps];
     for (const mdMap of mdMaps) {
       for (const key of Metadata.resolveKeys(mdMap, keyOrKeys)) {
         const values: MetadataValue[] = mdMap[key];
@@ -144,7 +150,7 @@ export class Metadata {
    * @param {string|string[]} keyOrKeys The metadata key(s) in scope. Wildcards are supported; see above.
    */
   private static resolveKeys(mdMap: MetadataMap, keyOrKeys: string | string[]): string[] {
-    const inputKeys: string[] = keyOrKeys instanceof Array ? keyOrKeys : [ keyOrKeys ];
+    const inputKeys: string[] = keyOrKeys instanceof Array ? keyOrKeys : [keyOrKeys];
     const outputKeys: string[] = [];
     for (const inputKey of inputKeys) {
       if (inputKey.includes('*')) {
@@ -160,4 +166,31 @@ export class Metadata {
     }
     return outputKeys;
   }
+
+  public static toViewModelList(mdMap: MetadataMap) {
+    let metadatumList: MetadatumViewModel[] = [];
+    Object.keys(mdMap).forEach((key: string) => {
+      const fields = mdMap[key].map(
+        (metadataValue: MetadataValue, index: number) =>
+          Object.assign(
+            {},
+            metadataValue,
+            {
+              order: index,
+              key
+            }));
+      metadatumList = [...metadatumList, ...fields];
+    });
+    return metadatumList;
+  }
+
+  public static toMetadataMap(viewModelList: MetadatumViewModel[]) {
+    const metadataMap: MetadataMap = {};
+    const groupedList = groupBy(viewModelList, (viewModel) => viewModel.key);
+    Object.keys(groupedList).forEach((key: string) => {
+      const orderedValues = sortBy(groupedList[key], ['order']);
+      metadataMap[key] = orderedValues.map((value: MetadataValue, index: number) => Object.assign({}, value, { order: index }))
+    });
+    return metadataMap;
+  }
 }

src/app/shared/comcol-forms/comcol-form/comcol-form.component.ts

@@ -8,7 +8,7 @@ import { FormGroup } from '@angular/forms';
 import { DynamicFormControlModel } from '@ng-dynamic-forms/core/src/model/dynamic-form-control.model';
 import { TranslateService } from '@ngx-translate/core';
 import { DSpaceObject } from '../../../core/shared/dspace-object.model';
-import { MetadataMap, MetadataValue } from '../../../core/shared/metadata.interfaces';
+import { MetadataMap, MetadataValue } from '../../../core/shared/metadata.models';
 import { isNotEmpty } from '../../empty.util';
 import { ResourceType } from '../../../core/shared/resource-type';
 
@@ -83,11 +83,14 @@ export class ComColFormComponent<T extends DSpaceObject> implements OnInit {
   onSubmit() {
     const formMetadata = new Object() as MetadataMap;
     this.formModel.forEach((fieldModel: DynamicInputModel) => {
-      const value: MetadataValue = { value: fieldModel.value as string, language: null };
+      const value: MetadataValue = Object.assign(new MetadataValue(), {
+        value: fieldModel.value as string,
+        language: null
+      });
       if (formMetadata.hasOwnProperty(fieldModel.name)) {
         formMetadata[fieldModel.name].push(value);
       } else {
-        formMetadata[fieldModel.name] = [ value ];
+        formMetadata[fieldModel.name] = [value];
       }
     });
 

src/app/shared/input-suggestions/input-suggestions.component.ts

@@ -12,7 +12,7 @@ import {
   ViewChildren
 } from '@angular/core';
 import { BehaviorSubject } from 'rxjs';
-import { hasValue, isNotEmpty } from '../empty.util';
+import { hasValue, isNotEmpty, isNotUndefined } from '../empty.util';
 import { InputSuggestion } from './input-suggestions.model';
 import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
 
@@ -128,7 +128,7 @@ export class InputSuggestionsComponent implements ControlValueAccessor, OnChange
    */
   ngOnChanges(changes: SimpleChanges) {
     if (hasValue(changes.suggestions)) {
-      this.show.next(isNotEmpty(changes.suggestions.currentValue));
+      this.show.next(isNotEmpty(changes.suggestions.currentValue) && !changes.suggestions.firstChange);
     }
   }
 

src/app/shared/object-grid/search-result-grid-element/search-result-grid-element.component.ts

@@ -6,7 +6,7 @@ import { AbstractListableElementComponent } from '../../object-collection/shared
 import { ListableObject } from '../../object-collection/shared/listable-object.model';
 import { TruncatableService } from '../../truncatable/truncatable.service';
 import { Observable } from 'rxjs';
-import { Metadata } from '../../../core/shared/metadata.model';
+import { Metadata } from '../../../core/shared/metadata.utils';
 
 @Component({
   selector: 'ds-search-result-grid-element',

src/app/shared/object-list/search-result-list-element/search-result-list-element.component.ts

@@ -6,7 +6,7 @@ import { DSpaceObject } from '../../../core/shared/dspace-object.model';
 import { ListableObject } from '../../object-collection/shared/listable-object.model';
 import { AbstractListableElementComponent } from '../../object-collection/shared/object-collection-element/abstract-listable-element.component';
 import { TruncatableService } from '../../truncatable/truncatable.service';
-import { Metadata } from '../../../core/shared/metadata.model';
+import { Metadata } from '../../../core/shared/metadata.utils';
 
 @Component({
   selector: 'ds-search-result-list-element',