From 5d77a13faedb71254f8136e83604223febe9f56b Mon Sep 17 00:00:00 2001
From: Paurikova2 <michaela.paurikova@dataquest.sk>
Date: Thu, 5 Mar 2026 09:05:15 +0100
Subject: [PATCH 1/6] Show full community hierarchy in sidebar search

---
 ...n-sidebar-search-list-element.component.ts |  4 ++-
 ...n-sidebar-search-list-element.component.ts | 14 ++++++++++
 ...y-sidebar-search-list-element.component.ts | 16 ++++++++++-
 ...ebar-search-list-element.component.spec.ts | 12 +++++++++
 .../sidebar-search-list-element.component.ts  | 27 ++++++++++++++++---
 5 files changed, 67 insertions(+), 6 deletions(-)

diff --git a/src/app/entity-groups/research-entities/item-list-elements/sidebar-search-list-elements/person/person-sidebar-search-list-element.component.ts b/src/app/entity-groups/research-entities/item-list-elements/sidebar-search-list-elements/person/person-sidebar-search-list-element.component.ts
index edae6c9ec9b..a9ba8c333d2 100644
--- a/src/app/entity-groups/research-entities/item-list-elements/sidebar-search-list-elements/person/person-sidebar-search-list-element.component.ts
+++ b/src/app/entity-groups/research-entities/item-list-elements/sidebar-search-list-elements/person/person-sidebar-search-list-element.component.ts
@@ -10,6 +10,7 @@ import { TruncatableService } from '../../../../../shared/truncatable/truncatabl
 import { LinkService } from '../../../../../core/cache/builders/link.service';
 import { TranslateService } from '@ngx-translate/core';
 import { DSONameService } from '../../../../../core/breadcrumbs/dso-name.service';
+import { DSOBreadcrumbsService } from '../../../../../core/breadcrumbs/dso-breadcrumbs.service';
 
 @listableObjectComponent('PersonSearchResult', ViewMode.ListElement, Context.SideBarSearchModal)
 @listableObjectComponent('PersonSearchResult', ViewMode.ListElement, Context.SideBarSearchModalCurrent)
@@ -26,8 +27,9 @@ export class PersonSidebarSearchListElementComponent extends SidebarSearchListEl
               protected linkService: LinkService,
               protected translateService: TranslateService,
               public dsoNameService: DSONameService,
+              protected dsoBreadcrumbsService: DSOBreadcrumbsService,
   ) {
-    super(truncatableService, linkService, dsoNameService);
+    super(truncatableService, linkService, dsoNameService, dsoBreadcrumbsService);
   }
 
   /**
diff --git a/src/app/shared/object-list/sidebar-search-list-element/collection/collection-sidebar-search-list-element.component.ts b/src/app/shared/object-list/sidebar-search-list-element/collection/collection-sidebar-search-list-element.component.ts
index 13703240f43..d09f2468f62 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/collection/collection-sidebar-search-list-element.component.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/collection/collection-sidebar-search-list-element.component.ts
@@ -5,6 +5,10 @@ import { listableObjectComponent } from '../../../object-collection/shared/lista
 import { Context } from '../../../../core/shared/context.model';
 import { ViewMode } from '../../../../core/shared/view-mode.model';
 import { SidebarSearchListElementComponent } from '../sidebar-search-list-element.component';
+import { TruncatableService } from '../../../truncatable/truncatable.service';
+import { LinkService } from '../../../../core/cache/builders/link.service';
+import { DSONameService } from '../../../../core/breadcrumbs/dso-name.service';
+import { DSOBreadcrumbsService } from '../../../../core/breadcrumbs/dso-breadcrumbs.service';
 
 @listableObjectComponent(CollectionSearchResult, ViewMode.ListElement, Context.SideBarSearchModal)
 @listableObjectComponent(CollectionSearchResult, ViewMode.ListElement, Context.SideBarSearchModalCurrent)
@@ -16,6 +20,16 @@ import { SidebarSearchListElementComponent } from '../sidebar-search-list-elemen
  * Component displaying a list element for a {@link CollectionSearchResult} within the context of a sidebar search modal
  */
 export class CollectionSidebarSearchListElementComponent extends SidebarSearchListElementComponent<CollectionSearchResult, Collection> {
+
+  constructor(
+    protected truncatableService: TruncatableService,
+    protected linkService: LinkService,
+    public dsoNameService: DSONameService,
+    protected dsoBreadcrumbsService: DSOBreadcrumbsService,
+  ) {
+    super(truncatableService, linkService, dsoNameService, dsoBreadcrumbsService);
+  }
+
   /**
    * Get the description of the Collection by returning its abstract
    */
diff --git a/src/app/shared/object-list/sidebar-search-list-element/community/community-sidebar-search-list-element.component.ts b/src/app/shared/object-list/sidebar-search-list-element/community/community-sidebar-search-list-element.component.ts
index 14c8ec09cd7..187842c6c7e 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/community/community-sidebar-search-list-element.component.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/community/community-sidebar-search-list-element.component.ts
@@ -5,17 +5,31 @@ import { ViewMode } from '../../../../core/shared/view-mode.model';
 import { SidebarSearchListElementComponent } from '../sidebar-search-list-element.component';
 import { CommunitySearchResult } from '../../../object-collection/shared/community-search-result.model';
 import { Community } from '../../../../core/shared/community.model';
+import { TruncatableService } from '../../../truncatable/truncatable.service';
+import { LinkService } from '../../../../core/cache/builders/link.service';
+import { DSONameService } from '../../../../core/breadcrumbs/dso-name.service';
+import { DSOBreadcrumbsService } from '../../../../core/breadcrumbs/dso-breadcrumbs.service';
 
 @listableObjectComponent(CommunitySearchResult, ViewMode.ListElement, Context.SideBarSearchModal)
 @listableObjectComponent(CommunitySearchResult, ViewMode.ListElement, Context.SideBarSearchModalCurrent)
 @Component({
-  selector: 'ds-collection-sidebar-search-list-element',
+  selector: 'ds-community-sidebar-search-list-element',
   templateUrl: '../sidebar-search-list-element.component.html'
 })
 /**
  * Component displaying a list element for a {@link CommunitySearchResult} within the context of a sidebar search modal
  */
 export class CommunitySidebarSearchListElementComponent extends SidebarSearchListElementComponent<CommunitySearchResult, Community> {
+
+  constructor(
+    protected truncatableService: TruncatableService,
+    protected linkService: LinkService,
+    public dsoNameService: DSONameService,
+    protected dsoBreadcrumbsService: DSOBreadcrumbsService,
+  ) {
+    super(truncatableService, linkService, dsoNameService, dsoBreadcrumbsService);
+  }
+
   /**
    * Get the description of the Community by returning its abstract
    */
diff --git a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts
index 226c1be33ef..70917f718ac 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts
@@ -11,6 +11,9 @@ import { createSuccessfulRemoteDataObject$ } from '../../remote-data.utils';
 import { HALResource } from '../../../core/shared/hal-resource.model';
 import { ChildHALResource } from '../../../core/shared/child-hal-resource.model';
 import { DSONameService } from '../../../core/breadcrumbs/dso-name.service';
+import { DSOBreadcrumbsService } from '../../../core/breadcrumbs/dso-breadcrumbs.service';
+import { Breadcrumb } from '../../../breadcrumbs/breadcrumb/breadcrumb.model';
+import { of as observableOf } from 'rxjs';
 
 export function createSidebarSearchListElementTests(
   componentClass: any,
@@ -33,12 +36,21 @@ export function createSidebarSearchListElementTests(
           [object.indexableObject.getParentLinkKey()]: createSuccessfulRemoteDataObject$(parent)
         })
       });
+      const breadcrumbs: Breadcrumb[] = [];
+      if (expectedParentTitle) {
+        breadcrumbs.push(new Breadcrumb(expectedParentTitle, ''));
+      }
+      breadcrumbs.push(new Breadcrumb(expectedTitle, ''));
+      const dsoBreadcrumbsService = jasmine.createSpyObj('dsoBreadcrumbsService', {
+        getBreadcrumbs: observableOf(breadcrumbs)
+      });
       TestBed.configureTestingModule({
         declarations: [componentClass, VarDirective],
         imports: [TranslateModule.forRoot(), RouterTestingModule.withRoutes([])],
         providers: [
           { provide: TruncatableService, useValue: {} },
           { provide: LinkService, useValue: linkService },
+          { provide: DSOBreadcrumbsService, useValue: dsoBreadcrumbsService },
           DSONameService,
           ...extraProviders
         ],
diff --git a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts
index 0ffe2d58b44..31de89da9a5 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts
@@ -1,7 +1,7 @@
 import { SearchResult } from '../../search/models/search-result.model';
 import { DSpaceObject } from '../../../core/shared/dspace-object.model';
 import { SearchResultListElementComponent } from '../search-result-list-element/search-result-list-element.component';
-import { Component } from '@angular/core';
+import { Component, OnInit } from '@angular/core';
 import { hasValue, isNotEmpty } from '../../empty.util';
 import { Observable, of as observableOf } from 'rxjs';
 import { TruncatableService } from '../../truncatable/truncatable.service';
@@ -12,6 +12,8 @@ import { followLink } from '../../utils/follow-link-config.model';
 import { RemoteData } from '../../../core/data/remote-data';
 import { Context } from '../../../core/shared/context.model';
 import { DSONameService } from '../../../core/breadcrumbs/dso-name.service';
+import { DSOBreadcrumbsService } from '../../../core/breadcrumbs/dso-breadcrumbs.service';
+import { DSpaceObjectType } from '../../../core/shared/dspace-object-type.model';
 
 @Component({
   selector: 'ds-sidebar-search-list-element',
@@ -22,7 +24,7 @@ import { DSONameService } from '../../../core/breadcrumbs/dso-name.service';
  * It displays the name of the parent, title and description of the object. All of which are customizable in the child
  * component by overriding the relevant methods of this component
  */
-export class SidebarSearchListElementComponent<T extends SearchResult<K>, K extends DSpaceObject> extends SearchResultListElementComponent<T, K> {
+export class SidebarSearchListElementComponent<T extends SearchResult<K>, K extends DSpaceObject> extends SearchResultListElementComponent<T, K> implements OnInit {
   /**
    * Observable for the title of the parent object (displayed above the object's title)
    */
@@ -36,6 +38,7 @@ export class SidebarSearchListElementComponent<T extends SearchResult<K>, K exte
   public constructor(protected truncatableService: TruncatableService,
                      protected linkService: LinkService,
                      public dsoNameService: DSONameService,
+                     protected dsoBreadcrumbsService: DSOBreadcrumbsService,
   ) {
     super(truncatableService, dsoNameService, null);
   }
@@ -59,10 +62,26 @@ export class SidebarSearchListElementComponent<T extends SearchResult<K>, K exte
   }
 
   /**
-   * Get the title of the object's parent
-   * Retrieve the parent by using the object's parent link and retrieving its 'dc.title' metadata
+   * Get the title of the object's parent(s)
+   * For communities and collections, show the full hierarchical path excluding the current item
+   * For other objects, show just the immediate parent
    */
   getParentTitle(): Observable<string> {
+    // For communities and collections, build hierarchical path
+    const typeValue = (this.dso as any).type?.value ?? (this.dso as any).type;
+    if (this.dso && (typeValue === DSpaceObjectType.COMMUNITY.toLowerCase() || typeValue === DSpaceObjectType.COLLECTION.toLowerCase())) {
+      return this.dsoBreadcrumbsService.getBreadcrumbs(this.dso as any, '').pipe(
+        map(breadcrumbs => {
+          // Remove the last breadcrumb (current item) and join the rest with ' / '
+          const parentBreadcrumbs = breadcrumbs.slice(0, -1);
+          return parentBreadcrumbs.length > 0
+            ? parentBreadcrumbs.map(crumb => crumb.text).join(' / ')
+            : undefined;
+        })
+      );
+    }
+
+    // For other DSO types, use the simple parent
     return this.getParent().pipe(
       map((parentRD: RemoteData<DSpaceObject>) => {
         return hasValue(parentRD) && hasValue(parentRD.payload) ? this.dsoNameService.getName(parentRD.payload) : undefined;

From 53b5f7fb12e3b9a8708dc2f60e7b076259b9aac7 Mon Sep 17 00:00:00 2001
From: Paurikova2 <michaela.paurikova@dataquest.sk>
Date: Thu, 5 Mar 2026 12:02:13 +0100
Subject: [PATCH 2/6] Add tooltip to parent path

---
 .../sidebar-search-list-element.component.html                   | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.html b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.html
index 040f528768d..31de2c7a1f9 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.html
+++ b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.html
@@ -1,5 +1,6 @@
 <ds-truncatable-part [maxLines]="1" [background]="isCurrent() ? 'primary' : 'default'" [showToggle]="false">
   <div [ngClass]="isCurrent() ? 'text-light' : 'text-body'"
+       [title]="(parentTitle$ && parentTitle$ | async) ? (parentTitle$ | async) : ('home.breadcrumbs' | translate)"
        [innerHTML]="(parentTitle$ && parentTitle$ | async) ? (parentTitle$ | async) : ('home.breadcrumbs' | translate)"></div>
 </ds-truncatable-part>
 <ds-truncatable-part [maxLines]="1" [background]="isCurrent() ? 'primary' : 'default'" [showToggle]="false">

From 84ad89de34d28624b48ef0ac3265e9b318526fdf Mon Sep 17 00:00:00 2001
From: Paurikova2 <michaela.paurikova@dataquest.sk>
Date: Thu, 5 Mar 2026 12:24:04 +0100
Subject: [PATCH 3/6] Add shareReplay, type guard, and hierarchical path tests

---
 ...ebar-search-list-element.component.spec.ts |  6 +-
 ...ebar-search-list-element.component.spec.ts |  6 +-
 ...ebar-search-list-element.component.spec.ts | 75 +++++++++++++++++++
 .../sidebar-search-list-element.component.ts  | 27 +++++--
 4 files changed, 104 insertions(+), 10 deletions(-)

diff --git a/src/app/shared/object-list/sidebar-search-list-element/collection/collection-sidebar-search-list-element.component.spec.ts b/src/app/shared/object-list/sidebar-search-list-element/collection/collection-sidebar-search-list-element.component.spec.ts
index be3ee7d1bb9..c3f76e8ef07 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/collection/collection-sidebar-search-list-element.component.spec.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/collection/collection-sidebar-search-list-element.component.spec.ts
@@ -2,7 +2,7 @@ import { CollectionSidebarSearchListElementComponent } from './collection-sideba
 import { CollectionSearchResult } from '../../../object-collection/shared/collection-search-result.model';
 import { Collection } from '../../../../core/shared/collection.model';
 import { Community } from '../../../../core/shared/community.model';
-import { createSidebarSearchListElementTests } from '../sidebar-search-list-element.component.spec';
+import { createHierarchicalParentTitleTests, createSidebarSearchListElementTests } from '../sidebar-search-list-element.component.spec';
 
 const object = Object.assign(new CollectionSearchResult(), {
   indexableObject: Object.assign(new Collection(), {
@@ -35,3 +35,7 @@ const parent = Object.assign(new Community(), {
 describe('CollectionSidebarSearchListElementComponent',
   createSidebarSearchListElementTests(CollectionSidebarSearchListElementComponent, object, parent, 'parent title', 'title', 'description')
 );
+
+describe('CollectionSidebarSearchListElementComponent - hierarchical path',
+  createHierarchicalParentTitleTests(CollectionSidebarSearchListElementComponent, object, 'title')
+);
diff --git a/src/app/shared/object-list/sidebar-search-list-element/community/community-sidebar-search-list-element.component.spec.ts b/src/app/shared/object-list/sidebar-search-list-element/community/community-sidebar-search-list-element.component.spec.ts
index d6bcfc85810..6e3a8f4d2fc 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/community/community-sidebar-search-list-element.component.spec.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/community/community-sidebar-search-list-element.component.spec.ts
@@ -1,5 +1,5 @@
 import { Community } from '../../../../core/shared/community.model';
-import { createSidebarSearchListElementTests } from '../sidebar-search-list-element.component.spec';
+import { createHierarchicalParentTitleTests, createSidebarSearchListElementTests } from '../sidebar-search-list-element.component.spec';
 import { CommunitySidebarSearchListElementComponent } from './community-sidebar-search-list-element.component';
 import { CommunitySearchResult } from '../../../object-collection/shared/community-search-result.model';
 
@@ -34,3 +34,7 @@ const parent = Object.assign(new Community(), {
 describe('CommunitySidebarSearchListElementComponent',
   createSidebarSearchListElementTests(CommunitySidebarSearchListElementComponent, object, parent, 'parent title', 'title', 'description')
 );
+
+describe('CommunitySidebarSearchListElementComponent - hierarchical path',
+  createHierarchicalParentTitleTests(CommunitySidebarSearchListElementComponent, object, 'title')
+);
diff --git a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts
index 70917f718ac..59d7cd4afb4 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts
@@ -82,3 +82,78 @@ export function createSidebarSearchListElementTests(
     });
   };
 }
+
+/**
+ * Shared test suite that verifies the hierarchical parent-path behaviour for community/collection
+ * list elements: when the DSO has multiple ancestor breadcrumbs the component must join them with
+ * ' / ' and must delegate to {@link DSOBreadcrumbsService#getBreadcrumbs} rather than the simple
+ * parent link.
+ *
+ * @param componentClass  The component under test (community or collection sidebar element)
+ * @param object          A {@link SearchResult} whose `indexableObject` is a Community/Collection
+ * @param expectedTitle   The dc.title of the current item (last breadcrumb)
+ * @param extraProviders  Any additional providers required by the component
+ */
+export function createHierarchicalParentTitleTests(
+  componentClass: any,
+  object: SearchResult<DSpaceObject & ChildHALResource>,
+  expectedTitle: string,
+  extraProviders: any[] = []
+) {
+  return () => {
+    let component;
+    let fixture: ComponentFixture<any>;
+    let dsoBreadcrumbsService;
+
+    // Three-level hierarchy:  Root → Parent → Current
+    const rootBreadcrumb   = new Breadcrumb('Root',    '');
+    const parentBreadcrumb = new Breadcrumb('Parent',  '');
+    const currentBreadcrumb = new Breadcrumb(expectedTitle, '');
+    const breadcrumbs = [rootBreadcrumb, parentBreadcrumb, currentBreadcrumb];
+
+    beforeEach(waitForAsync(() => {
+      const linkService = jasmine.createSpyObj('linkService', { resolveLink: {} });
+      dsoBreadcrumbsService = jasmine.createSpyObj('dsoBreadcrumbsService', {
+        getBreadcrumbs: observableOf(breadcrumbs)
+      });
+
+      TestBed.configureTestingModule({
+        declarations: [componentClass, VarDirective],
+        imports: [TranslateModule.forRoot(), RouterTestingModule.withRoutes([])],
+        providers: [
+          { provide: TruncatableService, useValue: {} },
+          { provide: LinkService, useValue: linkService },
+          { provide: DSOBreadcrumbsService, useValue: dsoBreadcrumbsService },
+          DSONameService,
+          ...extraProviders
+        ],
+        schemas: [NO_ERRORS_SCHEMA]
+      }).compileComponents();
+    }));
+
+    beforeEach(() => {
+      fixture = TestBed.createComponent(componentClass);
+      component = fixture.componentInstance;
+      component.object = object;
+      component.ngOnInit();
+      fixture.detectChanges();
+    });
+
+    it('should join multiple ancestor breadcrumbs with " / " as the parent title', (done) => {
+      component.parentTitle$.subscribe((title) => {
+        expect(title).toEqual('Root / Parent');
+        done();
+      });
+    });
+
+    it('should call DSOBreadcrumbsService.getBreadcrumbs to build the hierarchy path', (done) => {
+      component.parentTitle$.subscribe(() => {
+        expect(dsoBreadcrumbsService.getBreadcrumbs).toHaveBeenCalledWith(
+          object.indexableObject,
+          ''
+        );
+        done();
+      });
+    });
+  };
+}
diff --git a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts
index 31de89da9a5..ab0abf30ce8 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts
@@ -6,7 +6,7 @@ import { hasValue, isNotEmpty } from '../../empty.util';
 import { Observable, of as observableOf } from 'rxjs';
 import { TruncatableService } from '../../truncatable/truncatable.service';
 import { LinkService } from '../../../core/cache/builders/link.service';
-import { find, map } from 'rxjs/operators';
+import { find, map, shareReplay } from 'rxjs/operators';
 import { ChildHALResource } from '../../../core/shared/child-hal-resource.model';
 import { followLink } from '../../utils/follow-link-config.model';
 import { RemoteData } from '../../../core/data/remote-data';
@@ -61,23 +61,33 @@ export class SidebarSearchListElementComponent<T extends SearchResult<K>, K exte
     return this.context === Context.SideBarSearchModalCurrent;
   }
 
+  /**
+   * Type guard that narrows a {@link DSpaceObject} to {@link ChildHALResource} & {@link DSpaceObject},
+   * which is the signature expected by {@link DSOBreadcrumbsService#getBreadcrumbs}.
+   */
+  private isChildHALResource(dso: DSpaceObject): dso is ChildHALResource & DSpaceObject {
+    return typeof (dso as unknown as ChildHALResource).getParentLinkKey === 'function';
+  }
+
   /**
    * Get the title of the object's parent(s)
    * For communities and collections, show the full hierarchical path excluding the current item
    * For other objects, show just the immediate parent
    */
   getParentTitle(): Observable<string> {
-    // For communities and collections, build hierarchical path
-    const typeValue = (this.dso as any).type?.value ?? (this.dso as any).type;
+    // Fallback handles cases where type is a raw string rather than a ResourceType instance
+    const typeValue = this.dso.type?.value ?? (this.dso as any).type;
     if (this.dso && (typeValue === DSpaceObjectType.COMMUNITY.toLowerCase() || typeValue === DSpaceObjectType.COLLECTION.toLowerCase())) {
-      return this.dsoBreadcrumbsService.getBreadcrumbs(this.dso as any, '').pipe(
+      // For communities and collections, build hierarchical path via breadcrumbs
+      return this.dsoBreadcrumbsService.getBreadcrumbs(this.dso as unknown as ChildHALResource & DSpaceObject, '').pipe(
         map(breadcrumbs => {
           // Remove the last breadcrumb (current item) and join the rest with ' / '
           const parentBreadcrumbs = breadcrumbs.slice(0, -1);
           return parentBreadcrumbs.length > 0
             ? parentBreadcrumbs.map(crumb => crumb.text).join(' / ')
             : undefined;
-        })
+        }),
+        shareReplay({ bufferSize: 1, refCount: true }),
       );
     }
 
@@ -85,7 +95,8 @@ export class SidebarSearchListElementComponent<T extends SearchResult<K>, K exte
     return this.getParent().pipe(
       map((parentRD: RemoteData<DSpaceObject>) => {
         return hasValue(parentRD) && hasValue(parentRD.payload) ? this.dsoNameService.getName(parentRD.payload) : undefined;
-      })
+      }),
+      shareReplay({ bufferSize: 1, refCount: true }),
     );
   }
 
@@ -93,8 +104,8 @@ export class SidebarSearchListElementComponent<T extends SearchResult<K>, K exte
    * Get the parent of the object
    */
   getParent(): Observable<RemoteData<DSpaceObject>> {
-    if (typeof (this.dso as any).getParentLinkKey === 'function') {
-      const propertyName = (this.dso as any).getParentLinkKey();
+    if (this.isChildHALResource(this.dso)) {
+      const propertyName = this.dso.getParentLinkKey() as string;
       return this.linkService.resolveLink(this.dso, followLink(propertyName))[propertyName].pipe(
         find((parentRD: RemoteData<ChildHALResource & DSpaceObject>) => parentRD.hasSucceeded || parentRD.statusCode === 204)
       );

From 7c9d380edc7a63ddfd1d083d40af137e3ce8a120 Mon Sep 17 00:00:00 2001
From: Paurikova2 <michaela.paurikova@dataquest.sk>
Date: Thu, 5 Mar 2026 12:43:45 +0100
Subject: [PATCH 4/6] refactor: unwrap parentTitle$ once, extract
 BREADCRUMB_SEPARATOR, fix tests

---
 ...ebar-search-list-element.component.spec.ts |  2 +-
 ...ebar-search-list-element.component.spec.ts |  2 +-
 ...sidebar-search-list-element.component.html | 13 +++--
 ...ebar-search-list-element.component.spec.ts | 50 ++++++++++++++++---
 .../sidebar-search-list-element.component.ts  |  5 +-
 5 files changed, 60 insertions(+), 12 deletions(-)

diff --git a/src/app/shared/object-list/sidebar-search-list-element/collection/collection-sidebar-search-list-element.component.spec.ts b/src/app/shared/object-list/sidebar-search-list-element/collection/collection-sidebar-search-list-element.component.spec.ts
index c3f76e8ef07..089cd710d6a 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/collection/collection-sidebar-search-list-element.component.spec.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/collection/collection-sidebar-search-list-element.component.spec.ts
@@ -33,7 +33,7 @@ const parent = Object.assign(new Community(), {
 });
 
 describe('CollectionSidebarSearchListElementComponent',
-  createSidebarSearchListElementTests(CollectionSidebarSearchListElementComponent, object, parent, 'parent title', 'title', 'description')
+  createSidebarSearchListElementTests(CollectionSidebarSearchListElementComponent, object, parent, 'parent title', 'title', 'description', [], true)
 );
 
 describe('CollectionSidebarSearchListElementComponent - hierarchical path',
diff --git a/src/app/shared/object-list/sidebar-search-list-element/community/community-sidebar-search-list-element.component.spec.ts b/src/app/shared/object-list/sidebar-search-list-element/community/community-sidebar-search-list-element.component.spec.ts
index 6e3a8f4d2fc..51eab97db3b 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/community/community-sidebar-search-list-element.component.spec.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/community/community-sidebar-search-list-element.component.spec.ts
@@ -32,7 +32,7 @@ const parent = Object.assign(new Community(), {
 });
 
 describe('CommunitySidebarSearchListElementComponent',
-  createSidebarSearchListElementTests(CommunitySidebarSearchListElementComponent, object, parent, 'parent title', 'title', 'description')
+  createSidebarSearchListElementTests(CommunitySidebarSearchListElementComponent, object, parent, 'parent title', 'title', 'description', [], true)
 );
 
 describe('CommunitySidebarSearchListElementComponent - hierarchical path',
diff --git a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.html b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.html
index 31de2c7a1f9..102aa9c2bf7 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.html
+++ b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.html
@@ -1,7 +1,14 @@
 <ds-truncatable-part [maxLines]="1" [background]="isCurrent() ? 'primary' : 'default'" [showToggle]="false">
-  <div [ngClass]="isCurrent() ? 'text-light' : 'text-body'"
-       [title]="(parentTitle$ && parentTitle$ | async) ? (parentTitle$ | async) : ('home.breadcrumbs' | translate)"
-       [innerHTML]="(parentTitle$ && parentTitle$ | async) ? (parentTitle$ | async) : ('home.breadcrumbs' | translate)"></div>
+  <ng-container *ngIf="parentTitle$ | async as parentTitle; else defaultParentTitle">
+    <div [ngClass]="isCurrent() ? 'text-light' : 'text-body'"
+         [title]="parentTitle || ('home.breadcrumbs' | translate)"
+         [innerHTML]="parentTitle || ('home.breadcrumbs' | translate)"></div>
+  </ng-container>
+  <ng-template #defaultParentTitle>
+    <div [ngClass]="isCurrent() ? 'text-light' : 'text-body'"
+         [title]="'home.breadcrumbs' | translate"
+         [innerHTML]="'home.breadcrumbs' | translate"></div>
+  </ng-template>
 </ds-truncatable-part>
 <ds-truncatable-part [maxLines]="1" [background]="isCurrent() ? 'primary' : 'default'" [showToggle]="false">
   <div class="font-weight-bold"
diff --git a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts
index 59d7cd4afb4..b21d6439b49 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts
@@ -14,6 +14,8 @@ import { DSONameService } from '../../../core/breadcrumbs/dso-name.service';
 import { DSOBreadcrumbsService } from '../../../core/breadcrumbs/dso-breadcrumbs.service';
 import { Breadcrumb } from '../../../breadcrumbs/breadcrumb/breadcrumb.model';
 import { of as observableOf } from 'rxjs';
+import { BREADCRUMB_SEPARATOR } from './sidebar-search-list-element.component';
+import { ResourceType } from '../../../core/shared/resource-type';
 
 export function createSidebarSearchListElementTests(
   componentClass: any,
@@ -22,15 +24,24 @@ export function createSidebarSearchListElementTests(
   expectedParentTitle: string,
   expectedTitle: string,
   expectedDescription: string,
-  extraProviders: any[] = []
+  extraProviders: any[] = [],
+  assertBreadcrumbsUsed = false
 ) {
   return () => {
     let component;
     let fixture: ComponentFixture<any>;
 
     let linkService;
+    let dsoBreadcrumbsService;
 
     beforeEach(waitForAsync(() => {
+      // Propagate the class-level static ResourceType onto the instance so that
+      // the community/collection branch in getParentTitle() is reached correctly.
+      const staticType: ResourceType | undefined = (object.indexableObject.constructor as any).type;
+      if (staticType) {
+        (object.indexableObject as any).type = staticType;
+      }
+
       linkService = jasmine.createSpyObj('linkService', {
         resolveLink: Object.assign(new HALResource(), {
           [object.indexableObject.getParentLinkKey()]: createSuccessfulRemoteDataObject$(parent)
@@ -41,7 +52,7 @@ export function createSidebarSearchListElementTests(
         breadcrumbs.push(new Breadcrumb(expectedParentTitle, ''));
       }
       breadcrumbs.push(new Breadcrumb(expectedTitle, ''));
-      const dsoBreadcrumbsService = jasmine.createSpyObj('dsoBreadcrumbsService', {
+      dsoBreadcrumbsService = jasmine.createSpyObj('dsoBreadcrumbsService', {
         getBreadcrumbs: observableOf(breadcrumbs)
       });
       TestBed.configureTestingModule({
@@ -73,6 +84,18 @@ export function createSidebarSearchListElementTests(
       });
     });
 
+    if (assertBreadcrumbsUsed) {
+      it('should delegate to DSOBreadcrumbsService.getBreadcrumbs to resolve the parent title', (done) => {
+        component.parentTitle$.subscribe(() => {
+          expect(dsoBreadcrumbsService.getBreadcrumbs).toHaveBeenCalledWith(
+            object.indexableObject,
+            ''
+          );
+          done();
+        });
+      });
+    }
+
     it('should contain the correct title', () => {
       expect(component.dsoTitle).toEqual(expectedTitle);
     });
@@ -86,7 +109,7 @@ export function createSidebarSearchListElementTests(
 /**
  * Shared test suite that verifies the hierarchical parent-path behaviour for community/collection
  * list elements: when the DSO has multiple ancestor breadcrumbs the component must join them with
- * ' / ' and must delegate to {@link DSOBreadcrumbsService#getBreadcrumbs} rather than the simple
+ * {@link BREADCRUMB_SEPARATOR} and must delegate to {@link DSOBreadcrumbsService#getBreadcrumbs} rather than the simple
  * parent link.
  *
  * @param componentClass  The component under test (community or collection sidebar element)
@@ -112,7 +135,22 @@ export function createHierarchicalParentTitleTests(
     const breadcrumbs = [rootBreadcrumb, parentBreadcrumb, currentBreadcrumb];
 
     beforeEach(waitForAsync(() => {
-      const linkService = jasmine.createSpyObj('linkService', { resolveLink: {} });
+      // Propagate the class-level static ResourceType onto the instance so that
+      // the community/collection branch in getParentTitle() is reached correctly.
+      const staticType: ResourceType | undefined = (object.indexableObject.constructor as any).type;
+      if (staticType) {
+        (object.indexableObject as any).type = staticType;
+      }
+
+      // Set up the linkService with a safe observable for the parent link so that
+      // even if the type-check guard ever regresses, the fallback getParent() path
+      // does not crash with "Cannot read properties of undefined (reading 'pipe')".
+      const parentLinkKey = (object.indexableObject as ChildHALResource).getParentLinkKey() as string;
+      const linkService = jasmine.createSpyObj('linkService', {
+        resolveLink: Object.assign(new HALResource(), {
+          [parentLinkKey]: observableOf(undefined)
+        })
+      });
       dsoBreadcrumbsService = jasmine.createSpyObj('dsoBreadcrumbsService', {
         getBreadcrumbs: observableOf(breadcrumbs)
       });
@@ -139,9 +177,9 @@ export function createHierarchicalParentTitleTests(
       fixture.detectChanges();
     });
 
-    it('should join multiple ancestor breadcrumbs with " / " as the parent title', (done) => {
+    it('should join multiple ancestor breadcrumbs with BREADCRUMB_SEPARATOR as the parent title', (done) => {
       component.parentTitle$.subscribe((title) => {
-        expect(title).toEqual('Root / Parent');
+        expect(title).toEqual(['Root', 'Parent'].join(BREADCRUMB_SEPARATOR));
         done();
       });
     });
diff --git a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts
index ab0abf30ce8..bbc757af1df 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts
@@ -15,6 +15,9 @@ import { DSONameService } from '../../../core/breadcrumbs/dso-name.service';
 import { DSOBreadcrumbsService } from '../../../core/breadcrumbs/dso-breadcrumbs.service';
 import { DSpaceObjectType } from '../../../core/shared/dspace-object-type.model';
 
+/** Separator used when joining hierarchical breadcrumb labels into a single parent-title string. */
+export const BREADCRUMB_SEPARATOR = ' / ';
+
 @Component({
   selector: 'ds-sidebar-search-list-element',
   templateUrl: './sidebar-search-list-element.component.html'
@@ -84,7 +87,7 @@ export class SidebarSearchListElementComponent<T extends SearchResult<K>, K exte
           // Remove the last breadcrumb (current item) and join the rest with ' / '
           const parentBreadcrumbs = breadcrumbs.slice(0, -1);
           return parentBreadcrumbs.length > 0
-            ? parentBreadcrumbs.map(crumb => crumb.text).join(' / ')
+            ? parentBreadcrumbs.map(crumb => crumb.text).join(BREADCRUMB_SEPARATOR)
             : undefined;
         }),
         shareReplay({ bufferSize: 1, refCount: true }),

From 323bb09608d4af87c3c32144c02a555b821e45c2 Mon Sep 17 00:00:00 2001
From: Paurikova2 <michaela.paurikova@dataquest.sk>
Date: Thu, 5 Mar 2026 13:20:51 +0100
Subject: [PATCH 5/6] test: use createNoContentRemoteDataObject$ for safe
 fallback mock

---
 .../sidebar-search-list-element.component.spec.ts      | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts
index b21d6439b49..f7747a40894 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.spec.ts
@@ -7,7 +7,7 @@ import { SearchResult } from '../../search/models/search-result.model';
 import { DSpaceObject } from '../../../core/shared/dspace-object.model';
 import { TruncatableService } from '../../truncatable/truncatable.service';
 import { LinkService } from '../../../core/cache/builders/link.service';
-import { createSuccessfulRemoteDataObject$ } from '../../remote-data.utils';
+import { createSuccessfulRemoteDataObject$, createNoContentRemoteDataObject$ } from '../../remote-data.utils';
 import { HALResource } from '../../../core/shared/hal-resource.model';
 import { ChildHALResource } from '../../../core/shared/child-hal-resource.model';
 import { DSONameService } from '../../../core/breadcrumbs/dso-name.service';
@@ -142,13 +142,13 @@ export function createHierarchicalParentTitleTests(
         (object.indexableObject as any).type = staticType;
       }
 
-      // Set up the linkService with a safe observable for the parent link so that
-      // even if the type-check guard ever regresses, the fallback getParent() path
-      // does not crash with "Cannot read properties of undefined (reading 'pipe')".
+      // Set up the linkService with a safe RemoteData observable for the parent link so that
+      // even if the type-check guard ever regresses, the fallback getParent() path resolves
+      // cleanly via the find() predicate (statusCode === 204) without a TypeError.
       const parentLinkKey = (object.indexableObject as ChildHALResource).getParentLinkKey() as string;
       const linkService = jasmine.createSpyObj('linkService', {
         resolveLink: Object.assign(new HALResource(), {
-          [parentLinkKey]: observableOf(undefined)
+          [parentLinkKey]: createNoContentRemoteDataObject$()
         })
       });
       dsoBreadcrumbsService = jasmine.createSpyObj('dsoBreadcrumbsService', {

From ef0c8da0d20e1c0918fa90421790645a762761e3 Mon Sep 17 00:00:00 2001
From: Paurikova2 <michaela.paurikova@dataquest.sk>
Date: Wed, 11 Mar 2026 07:59:16 +0100
Subject: [PATCH 6/6] Removed unsafe type cast

---
 .../sidebar-search-list-element.component.ts                 | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts
index bbc757af1df..663d5e5d888 100644
--- a/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts
+++ b/src/app/shared/object-list/sidebar-search-list-element/sidebar-search-list-element.component.ts
@@ -80,9 +80,10 @@ export class SidebarSearchListElementComponent<T extends SearchResult<K>, K exte
   getParentTitle(): Observable<string> {
     // Fallback handles cases where type is a raw string rather than a ResourceType instance
     const typeValue = this.dso.type?.value ?? (this.dso as any).type;
-    if (this.dso && (typeValue === DSpaceObjectType.COMMUNITY.toLowerCase() || typeValue === DSpaceObjectType.COLLECTION.toLowerCase())) {
+    const dso: DSpaceObject = this.dso;
+    if (dso && this.isChildHALResource(dso) && (typeValue === DSpaceObjectType.COMMUNITY.toLowerCase() || typeValue === DSpaceObjectType.COLLECTION.toLowerCase())) {
       // For communities and collections, build hierarchical path via breadcrumbs
-      return this.dsoBreadcrumbsService.getBreadcrumbs(this.dso as unknown as ChildHALResource & DSpaceObject, '').pipe(
+      return this.dsoBreadcrumbsService.getBreadcrumbs(dso, '').pipe(
         map(breadcrumbs => {
           // Remove the last breadcrumb (current item) and join the rest with ' / '
           const parentBreadcrumbs = breadcrumbs.slice(0, -1);