角度材质+GAPI:表格显示行,但单元格为空

我正在集成angular material和Google api。我想在一个表中显示api的响应。问题是没有填充mat表行的mat单元格,但显示了该行。这是我的桌子:

    <mat-table [dataSource]="dataSource">

    <ng-container matColumnDef="name">
      <mat-header-cell *matHeaderCellDef> Name </mat-header-cell>
      <mat-cell *matCellDef="let user"> {{user.name}} </mat-cell>
    </ng-container>
    <ng-container matColumnDef="age">
      <mat-header-cell *matHeaderCellDef> Age </mat-header-cell>
      <mat-cell *matCellDef="let user"> {{user.age}} </mat-cell>
    </ng-container>
    <ng-container matColumnDef="city">
      <mat-header-cell *matHeaderCellDef> City </mat-header-cell>
      <mat-cell *matCellDef="let user"> {{user.city}} </mat-cell>
    </ng-container>
    <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
    <mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
  </mat-table>

这是我创建的一个界面:

    export interface User { name: string; age: number; city: string; }

这是与表关联的组件:

    export class UsertableComponent implements OnInit, OnChanges {
  @Input() apiReady: boolean;

  dataSource: UserDataSource;
  displayedColumns = ['name', 'age', 'city'];

  constructor(private userService: UserService) {

  }

  ngOnInit() {

  }

  ngOnChanges(changes: SimpleChanges) {
    if (this.apiReady) {
      this.dataSource = new UserDataSource(this.userService);
    }
  }
}

export class UserDataSource extends DataSource<any> {
  constructor(private userService: UserService) {
    super();
  }

  connect(): Observable<User[]> {
    return this.userService.getUsers();
  }

  disconnect() {

  }
}

最后,这里是噩梦。调用gapi并返回数据的服务。我可以确保api响应,尤其是这一行代码 回答后果用户[0]。名称全名 与具有值的字符串对象相对应。

export class UserService {
  private serviceUrl = environment.apiUrl + '/getcust/';
  private apiLoaded = false;
  constructor(private http: HttpClient) { }

  getUsers(): Observable<User[]> {
    /* // THIS WORKS!!!
        const u: User = {
          'name': 'ss',
          'city': 'città',
          'age': 3
        };
        return Observable.create(observable => {
          observable.next([u]);
          observable.complete();
        });
     */

    return Observable.create(observable => { // THIS DOESN'T WORK
      return gapi.client.directory.users.list({
        'customer': 'my_customer',
        'maxResults': 1,
        'orderBy': 'email'
      }).then(response => {

        const u: User = {
          'name': response.result.users[0].name.fullName,
          'city': 'citta',
          'age': 3
        };

        observable.next([u]);
        observable.complete();
      });
    });
  }
}

正如您在评论中看到的,被评论的行有效,其他行无效。

Result with empty cells

Result with populated cells, without calling GAPI