Changed DataService's create method in the way to accept array of request params

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

@@ -152,6 +152,33 @@ export abstract class DataService<T extends CacheableObject> {
     }
   }
 
+  /**
+   * Turn an array of RequestParam into a query string and combine it with the given HREF
+   *
+   * @param href The HREF to which the query string should be appended
+   * @param params Array with additional params to combine with query string
+   * @param linksToFollow   List of {@link FollowLinkConfig} that indicate which {@link HALLink}s should be automatically resolved
+   *
+   * @return {Observable<string>}
+   * Return an observable that emits created HREF
+   */
+  protected buildHrefWithParams(href: string, params: RequestParam[], ...linksToFollow: Array<FollowLinkConfig<T>>): string {
+
+    let  args = [];
+    if (hasValue(params)) {
+      params.forEach((param: RequestParam) => {
+        args.push(`${param.fieldName}=${param.fieldValue}`);
+      })
+    }
+
+    args = this.addEmbedParams(args, ...linksToFollow);
+
+    if (isNotEmpty(args)) {
+      return new URLCombiner(href, `?${args.join('&')}`).toString();
+    } else {
+      return href;
+    }
+  }
   /**
    * Adds the embed options to the link for the request
    * @param args            params for the query string
@@ -379,15 +406,15 @@ export abstract class DataService<T extends CacheableObject> {
    *
    * @param {DSpaceObject} dso
    *    The object to create
-   * @param {string} parentUUID
-   *    The UUID of the parent to create the new object under
+   * @param {RequestParam[]} params
+   *    Array with additional params to combine with query string
    */
-  create(dso: T, parentUUID: string): Observable<RemoteData<T>> {
+  create(dso: T, ...params: RequestParam[]): Observable<RemoteData<T>> {
     const requestId = this.requestService.generateRequestId();
     const endpoint$ = this.halService.getEndpoint(this.linkPath).pipe(
       isNotEmptyOperator(),
       distinctUntilChanged(),
-      map((endpoint: string) => parentUUID ? `${endpoint}?parent=${parentUUID}` : endpoint)
+      map((endpoint: string) => this.buildHrefWithParams(endpoint, params))
     );
 
     const serializedDso = new DSpaceSerializer(getClassForType((dso as any).type)).serialize(dso);

src/app/shared/comcol-forms/create-comcol-page/create-comcol-page.component.ts

@@ -13,6 +13,7 @@ import { getSucceededRemoteData } from '../../../core/shared/operators';
 import { ResourceType } from '../../../core/shared/resource-type';
 import { hasValue, isNotEmpty, isNotUndefined } from '../../empty.util';
 import { NotificationsService } from '../../notifications/notifications.service';
+import { RequestParam } from '../../../core/cache/models/request-param.model';
 
 /**
  * Component representing the create page for communities and collections
@@ -76,7 +77,7 @@ export class CreateComColPageComponent<TDomain extends DSpaceObject> implements
     const uploader = event.uploader;
 
     this.parentUUID$.pipe(take(1)).subscribe((uuid: string) => {
-      this.dsoDataService.create(dso, uuid)
+      this.dsoDataService.create(dso, new RequestParam('parent', uuid))
         .pipe(getSucceededRemoteData())
         .subscribe((dsoRD: RemoteData<TDomain>) => {
           if (isNotUndefined(dsoRD)) {