fixed issue with adding/selecting relation

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

@@ -250,9 +250,10 @@ export class RelationshipService extends DataService<Relationship> {
       .pipe(
         switchMap((relationships: Relationship[]) => {
           return observableCombineLatest(...relationships.map((relationship: Relationship) => {
+            console.log('relationship: ', relationship.uuid);
             return observableCombineLatest(
-              this.isItemMatchWithItemRD(relationship.leftItem, item2),
-              this.isItemMatchWithItemRD(relationship.rightItem, item2)
+              this.isItemMatchWithItemRD(relationship.leftItem, item2, 'left'),
+              this.isItemMatchWithItemRD(relationship.rightItem, item2, 'right')
             ).pipe(
               filter(([isLeftItem, isRightItem]) => isLeftItem || isRightItem),
               map(() => relationship),
@@ -265,10 +266,11 @@ export class RelationshipService extends DataService<Relationship> {
   }
 
 
-  private isItemMatchWithItemRD(itemRD$: Observable<RemoteData<Item>>, itemCheck: Item): Observable<boolean> {
+  private isItemMatchWithItemRD(itemRD$: Observable<RemoteData<Item>>, itemCheck: Item, side: string): Observable<boolean> {
     return itemRD$.pipe(
       getSucceededRemoteData(),
       map((itemRD: RemoteData<Item>) => itemRD.payload),
+      tap((item) => console.log(side, ': ', item.uuid)),
       map((item: Item) => item.uuid === itemCheck.uuid)
     );
   }

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

@@ -69,7 +69,7 @@ import { DsDynamicFormArrayComponent } from './models/array-group/dynamic-form-a
 import { DsDynamicRelationGroupComponent } from './models/relation-group/dynamic-relation-group.components';
 import { DYNAMIC_FORM_CONTROL_TYPE_RELATION_GROUP } from './models/relation-group/dynamic-relation-group.model';
 import { DsDatePickerInlineComponent } from './models/date-picker-inline/dynamic-date-picker-inline.component';
-import { map, switchMap, tap } from 'rxjs/operators';
+import { map, switchMap, take, tap } from 'rxjs/operators';
 import { SelectableListState } from '../../../object-list/selectable-list/selectable-list.reducer';
 import { Observable } from 'rxjs';
 import { SearchResult } from '../../../search/search-result.model';
@@ -92,6 +92,8 @@ import { DsDynamicInputModel } from './models/ds-dynamic-input.model';
 import { getSucceededRemoteData } from '../../../../core/shared/operators';
 import { RemoteData } from '../../../../core/data/remote-data';
 import { Item } from '../../../../core/shared/item.model';
+import { Relationship } from '../../../../core/shared/item-relationships/relationship.model';
+import { ItemDataService } from '../../../../core/data/item-data.service';
 
 export function dsDynamicFormControlMapFn(model: DynamicFormControlModel): Type<DynamicFormControl> | null {
   switch (model.type) {
@@ -182,7 +184,7 @@ export class DsDynamicFormControlContainerComponent extends DynamicFormControlCo
   modelValueMDRepresentation;
   listId: string;
   searchConfig: string;
-
+  uuid;
   /* tslint:disable:no-output-rename */
   @Output('dfBlur') blur: EventEmitter<DynamicFormControlEvent> = new EventEmitter<DynamicFormControlEvent>();
   @Output('dfChange') change: EventEmitter<DynamicFormControlEvent> = new EventEmitter<DynamicFormControlEvent>();
@@ -205,6 +207,8 @@ export class DsDynamicFormControlContainerComponent extends DynamicFormControlCo
     private modalService: NgbModal,
     private relationService: RelationshipService,
     private selectableListService: SelectableListService,
+    private itemService: ItemDataService,
+    private relationshipService: RelationshipService,
   ) {
     super(componentFactoryResolver, layoutService, validationService);
   }
@@ -215,8 +219,9 @@ export class DsDynamicFormControlContainerComponent extends DynamicFormControlCo
       this.listId = 'list-' + this.model.relationship.relationshipType;
       this.model.workspaceItem.item.pipe(
         getSucceededRemoteData(),
+        tap((itemRD: RemoteData<Item>) => this.uuid = itemRD.payload.uuid),
         switchMap((itemRD: RemoteData<Item>) => this.relationService.getRelatedItemsByLabel(itemRD.payload, this.model.relationship.relationshipType)),
-        map((items: Item[]) => items.map((item) => Object.assign(new SearchResult(), { indexableObject: item })))
+        map((items: Item[]) => items.map((item) => Object.assign(new SearchResult(), { indexableObject: item }))),
       ).subscribe((relatedItems) => this.selectableListService.select(this.listId, relatedItems));
 
       this.model.value = this.selectableListService.getSelectableList(this.listId).pipe(
@@ -275,10 +280,17 @@ export class DsDynamicFormControlContainerComponent extends DynamicFormControlCo
     modalComp.listId = this.listId;
     modalComp.relationship = this.model.relationship;
     modalComp.label = this.model.label;
-    modalComp.itemRD$ = this.model.workspaceItem.item;
+    modalComp.uuid = this.uuid;
   }
 
-  removeSelection(object: SearchResult<DSpaceObject>) {
+  removeSelection(object: SearchResult<Item>) {
     this.selectableListService.deselectSingle(this.listId, object);
+    setTimeout(() => this.itemService.findById(this.uuid).pipe(
+      getSucceededRemoteData(),
+      switchMap((itemRD: RemoteData<Item>) => this.relationshipService.getRelationshipByItemsAndLabel(itemRD.payload, object.indexableObject, this.model.relationship.relationshipType)),
+      tap(t => console.log(t)),
+      switchMap((relationship: Relationship) => this.relationshipService.deleteRelationship(relationship.id)),
+      take(1)
+    ).subscribe(), 0);
   }
 }

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

@@ -25,6 +25,7 @@ import { Item } from '../../../../../core/shared/item.model';
 import { RelationshipOptions } from '../../models/relationship-options.model';
 import { Relationship } from '../../../../../core/shared/item-relationships/relationship.model';
 import { ItemDataService } from '../../../../../core/data/item-data.service';
+import { ObjectCacheService } from '../../../../../core/cache/object-cache.service';
 
 @Component({
   selector: 'ds-dynamic-lookup-relation-modal',
@@ -40,7 +41,6 @@ import { ItemDataService } from '../../../../../core/data/item-data.service';
 export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy {
   label: string;
   relationship: RelationshipOptions;
-  itemRD$: Observable<RemoteData<Item>>;
   listId: string;
   resultsRD$: Observable<RemoteData<PaginatedList<SearchResult<Item>>>>;
   searchConfig: PaginatedSearchOptions;
@@ -55,6 +55,7 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
     pageSize: 10
   });
   selection$: Observable<ListableObject[]>;
+  uuid;
 
   constructor(
     public modal: NgbActiveModal,
@@ -65,12 +66,12 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
     private routeService: RouteService,
     private relationshipService: RelationshipService,
     private relationshipTypeService: RelationshipTypeService,
-    private itemService: ItemDataService
+    private itemService: ItemDataService,
+    private objectCache: ObjectCacheService,
   ) {
   }
 
   ngOnInit(): void {
-    this.itemRD$.subscribe(t => console.log('subscription', t));
     this.resetRoute();
     this.routeService.setParameter('fixedFilterQuery', this.relationship.filter);
     this.routeService.setParameter('configuration', this.relationship.searchConfiguration);
@@ -96,7 +97,7 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
           ) as any
         )
       })
-    )
+    );
 
   }
 
@@ -149,9 +150,8 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
 
 
   select(selectableObject: SearchResult<Item>) {
-    this.itemRD$
+    this.itemService.findById(this.uuid)
       .pipe(
-        tap((t) => console.log('tap',t)),
         getSucceededRemoteData(),
         mergeMap((itemRD: RemoteData<Item>) => {
           const type1: string = itemRD.payload.firstMetadataValue('relationship.type');
@@ -165,8 +165,7 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
                   return this.relationshipService.addRelationship(type.id, itemRD.payload, selectableObject.indexableObject);
                 }
               }
-            ),
-            tap(() => this.itemRD$ = this.itemService.findById(itemRD.payload.uuid))
+            )
           );
 
         }),
@@ -177,7 +176,7 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
 
 
   deselect(selectableObject: SearchResult<Item>) {
-    const subscription = this.itemRD$.pipe(
+    this.itemService.findById(this.uuid).pipe(
       getSucceededRemoteData(),
       switchMap((itemRD: RemoteData<Item>) => this.relationshipService.getRelationshipByItemsAndLabel(itemRD.payload, selectableObject.indexableObject, this.relationship.relationshipType)),
       switchMap((relationship: Relationship) => this.relationshipService.deleteRelationship(relationship.id)),