feat(collaborators): add totalCount function (#190)

Add getTotalCount function returning the meta.totalCount property of the last performed query,
allowing clients to display the total number of collaborators without cascading through the
links.next results.

src/app/collaborators/collaborator.service.spec.ts

@@ -13,6 +13,7 @@ import { Broadcaster, Logger } from 'ngx-base';
 
 import { WIT_API_URL } from '../api/wit-api';
 import { CollaboratorService } from './collaborator.service';
+import { concatMap } from 'rxjs/operators';
 
 describe('Service: CollaboratorService', () => {
 
@@ -86,7 +87,19 @@ describe('Service: CollaboratorService', () => {
       'type': 'identities'
     }
   ];
-  let response = { data: responseData, links: {} };
+  let response = { data: responseData, links: {}, meta: { totalCount: 3 } };
+
+  describe('#getTotalCount', () => {
+    it('should default to -1', () => {
+      collaboratorService.getTotalCount()
+        .subscribe(
+          (count: number): void => {
+            expect(count).toEqual(-1);
+          },
+          fail
+        );
+    });
+  });
 
   describe('#getInitialBySpaceId', () => {
     it('should get collaborators by Space ID', (done: DoneFn) => {
@@ -109,6 +122,28 @@ describe('Service: CollaboratorService', () => {
       done();
     });
 
+    it('should update totalCount', (done: DoneFn) => {
+      // when
+      collaboratorService.getInitialBySpaceId('1')
+        .pipe(
+          concatMap(() => collaboratorService.getTotalCount())
+        )
+        .subscribe((count: number): void => {
+          // then
+          expect(count).toEqual(3);
+        },
+        fail
+      );
+      // CollaboratorService should have made one request to GET collaborators from expected URL
+      const req = httpTestingController.expectOne(collaboratorService.spacesUrl + '/1/collaborators?page[limit]=20');
+      expect(req.request.method).toEqual('GET');
+
+      // Respond with the mock collaborator
+      req.flush(response);
+      httpTestingController.verify();
+      done();
+    });
+
     it('can test for network error', () => {
       const emsg = 'simulated network error';
 

src/app/collaborators/collaborator.service.ts

@@ -6,7 +6,8 @@ import {
 
 import {
   Observable,
-  throwError as observableThrowError
+  throwError as observableThrowError,
+  of
 } from 'rxjs';
 import {
   catchError,
@@ -25,6 +26,7 @@ export class CollaboratorService {
 
   private headers = new HttpHeaders({ 'Content-Type': 'application/json' });
   private nextLink: string;
+  private totalCount: number = -1;
 
   constructor(
     private http: HttpClient,
@@ -49,6 +51,11 @@ export class CollaboratorService {
           } else {
             this.nextLink = null;
           }
+          if (response.meta && response.meta.hasOwnProperty('totalCount')) {
+            this.totalCount = response.meta.totalCount;
+          } else {
+            this.totalCount = -1;
+          }
 
           let collaborators: User[] = response.data as User[];
           return collaborators;
@@ -104,6 +111,10 @@ export class CollaboratorService {
       );
   }
 
+  getTotalCount(): Observable<number> {
+    return of(this.totalCount);
+  }
+
   private handleError(error: any) {
     this.logger.error(error);
     return observableThrowError(error.message || error);