Enhancement: document link field fixes (#5020)

* Implement more efficient getFew for document retrieval

* Filter out parent document ID & already-selected documents

* Clip very long document titles

src-ui/src/app/services/rest/abstract-paperless-service.spec.ts

@@ -96,6 +96,21 @@ export const commonAbstractPaperlessServiceTests = (endpoint, ServiceClass) => {
       expect(req.request.method).toEqual('PATCH')
       req.flush([])
     })
+
+    test('should call appropriate api endpoint for get a few objects', () => {
+      subscription = service.getFew([1, 2, 3]).subscribe()
+      const req = httpTestingController.expectOne(
+        `${environment.apiBaseUrl}${endpoint}/?id__in=1,2,3`
+      )
+      expect(req.request.method).toEqual('GET')
+      req.flush([])
+      subscription = service.getFew([4, 5, 6], { foo: 'bar' }).subscribe()
+      const req2 = httpTestingController.expectOne(
+        `${environment.apiBaseUrl}${endpoint}/?id__in=4,5,6&foo=bar`
+      )
+      expect(req2.request.method).toEqual('GET')
+      req2.flush([])
+    })
   })
 
   beforeEach(() => {

src-ui/src/app/services/rest/abstract-paperless-service.ts

@@ -91,6 +91,19 @@ export abstract class AbstractPaperlessService<T extends ObjectWithId> {
     )
   }
 
+  getFew(ids: number[], extraParams?): Observable<Results<T>> {
+    let httpParams = new HttpParams()
+    httpParams = httpParams.set('id__in', ids.join(','))
+    for (let extraParamKey in extraParams) {
+      if (extraParams[extraParamKey] != null) {
+        httpParams = httpParams.set(extraParamKey, extraParams[extraParamKey])
+      }
+    }
+    return this.http.get<Results<T>>(this.getResourceUrl(), {
+      params: httpParams,
+    })
+  }
+
   clearCache() {
     this._listAll = null
   }