Merge pull request #3803 from DSpace/backport-3142-to-dspace-8_x

[Port dspace-8_x] Add support for non repeatable relationships

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

@@ -110,7 +110,7 @@ describe('EditRelationshipListComponent', () => {
     },
   };
 
-  function init(leftType: string, rightType: string): void {
+  function init(leftType: string, rightType: string, leftMaxCardinality?: number, rightMaxCardinality?: number): void {
     entityTypeLeft = Object.assign(new ItemType(), {
       id: leftType,
       uuid: leftType,
@@ -130,6 +130,8 @@ describe('EditRelationshipListComponent', () => {
       rightType: createSuccessfulRemoteDataObject$(entityTypeRight),
       leftwardType: `is${rightType}Of${leftType}`,
       rightwardType: `is${leftType}Of${rightType}`,
+      leftMaxCardinality: leftMaxCardinality,
+      rightMaxCardinality: rightMaxCardinality,
     });
 
     paginationOptions = Object.assign(new PaginationComponentOptions(), {
@@ -402,4 +404,31 @@ describe('EditRelationshipListComponent', () => {
       }));
     });
   });
+
+  describe('Is repeatable relationship', () => {
+    beforeEach(waitForAsync(() => {
+      currentItemIsLeftItem$ =  new BehaviorSubject<boolean>(true);
+    }));
+    describe('when max cardinality is 1', () => {
+      beforeEach(waitForAsync(() => init('Publication', 'OrgUnit', 1, undefined)));
+      it('should return false', () => {
+        const result = (comp as any).isRepeatable();
+        expect(result).toBeFalse();
+      });
+    });
+    describe('when max cardinality is 2', () => {
+      beforeEach(waitForAsync(() => init('Publication', 'OrgUnit', 2, undefined)));
+      it('should return true', () => {
+        const result = (comp as any).isRepeatable();
+        expect(result).toBeTrue();
+      });
+    });
+    describe('when max cardinality is undefined', () => {
+      beforeEach(waitForAsync(() => init('Publication', 'OrgUnit', undefined, undefined)));
+      it('should return true', () => {
+        const result = (comp as any).isRepeatable();
+        expect(result).toBeTrue();
+      });
+    });
+  });
 });

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

@@ -264,6 +264,22 @@ export class EditRelationshipListComponent implements OnInit, OnDestroy {
     return update && update.field ? update.field.uuid : undefined;
   }
 
+  /**
+   * Check whether the current entity can have multiple relationships of this type
+   * This is based on the max cardinality of the relationship
+   * @private
+   */
+  private isRepeatable(): boolean {
+    const isLeft = this.currentItemIsLeftItem$.getValue();
+    if (isLeft) {
+      const leftMaxCardinality = this.relationshipType.leftMaxCardinality;
+      return hasNoValue(leftMaxCardinality) || leftMaxCardinality > 1;
+    } else {
+      const rightMaxCardinality = this.relationshipType.rightMaxCardinality;
+      return hasNoValue(rightMaxCardinality) || rightMaxCardinality > 1;
+    }
+  }
+
   /**
    * Open the dynamic lookup modal to search for items to add as relationships
    */
@@ -281,6 +297,7 @@ export class EditRelationshipListComponent implements OnInit, OnDestroy {
     modalComp.toAdd = [];
     modalComp.toRemove = [];
     modalComp.isPending = false;
+    modalComp.repeatable = this.isRepeatable();
     modalComp.hiddenQuery = '-search.resourceid:' + this.item.uuid;
 
     this.item.owningCollection.pipe(