Question

我有一个Observable。如果成功，我想给用户反馈，然后刷新页面上的数据。所以我所做的就是调用do运算符来获取用户反馈，然后调用forkJoin来刷新数据。问题是，forkJoin之后无法拨打do并出现以下错误：Error:(37, 12) TS2339: Property 'forkJoin' does not exist on type 'Observable<void>'.

代码：

this.pickService.activate(event)
  .do(() => this.snackBar.open(`Pick activated`, null, {duration: 5000}))
  .forkJoin([
    this.pickService.get('DRAFT', 'dt,asc'),
    this.pickService.get('PENDING', 'dt,desc')
  ])
  .subscribe(results => {
    this.draftPicks = results[0];
    this.pendingPicks = results[1];
  });

The Observable

  activate(id: string): Observable<void> {
    return this.http.patch<void>(`/api/v1/picks/${id}`, {status: 'PENDING'});
  }

Answer 1

forkJoin是静态创建方法，不是运营商可以链。所以你只能Observable.forkJoin。

Answer 2

forkJoin只是一个可观察的创建方法。所以我认为你想要做的就是这样：

let requests = [ this.pickService.get('DRAFT', 'dt,asc'),
                 this.pickService.get('PENDING', 'dt,desc') ];

this.pickService.activate(event)
                .do(() => this.snackBar.open(`Pick activated`, null, {duration: 5000}))
                .switchMap(a => Observable.forkJoin(requests))
                .subscribe(...)

带有Observable的forkJoin <void>

2 个答案: