Angular 如何在ngrx效果中调用两次服务？

我有一个效果是监听一个动作，这个效果是一次调用api（检索10个随机电影），这是一个正常的行为，但我想调用同一个服务两次

loadMovies$ = createEffect(() => this.actions$.pipe(
   ofType('[Movies Page] Load 20 Movies'),
   mergeMap(() => this.moviesService.getTenRandomMovies()
      .pipe(
        map(movies => ({ type: '[Movies API] 10 Movies Loaded Success', payload: movies })),
        catchError(() => EMPTY)
     ))
   )
 );

我在考虑这个解决方案，但看起来很奇怪。如果这是唯一的可能，请告诉我

 dispatchTwiceGetAuthQuestions$ = createEffect(() =>
    this.actions$.pipe(
        ofType('[Movies Page] Load 20 Movies'),
        tap(() => {
          this.store.dispatch(new LoadTenRandomMovies()); 
        }),
        tap(() => {
            this.store.dispatch(new LoadTenRandomMovies()); 
        })
    )
);


loadMovies$ = createEffect(() => this.actions$.pipe(
   ofType('[Movies Page] Load 10 Movies'),
   mergeMap(() => this.moviesService.getTenRandomMovies()
      .pipe(
        map(movies => ({ type: '[Movies API] 10 Movies Loaded Success', payload: movies })),
        catchError(() => EMPTY)
     ))
   )
 );

---

注意：无法更新后端。

您可以编写一个新函数

moviesService.getRandomMovies（pagesToGet:int）

let可观测项：任意[]=[]；
for（设i=0；iresults.flat（））

使用forkJoin应该足够了

loadMovies$ = createEffect(() => this.actions$.pipe(
   ofType('[Movies Page] Load 10 Movies'),
   switchMap(() => 
      forkJoin([
             this.moviesService.getTenRandomMovies(), 
             this.moviesService.getTenRandomMovies()
      ])
      .pipe(
        map(([response1,response2]) => {
          // do something
        }),
        map(movies => ({ type: '[Movies API] 10 Movies Loaded Success', payload: movies 
       })),
        catchError(() => EMPTY)
     ))
   )
 );

---

有关于这个问题的最新消息吗？

loadMovies$ = createEffect(() => this.actions$.pipe(
   ofType('[Movies Page] Load 10 Movies'),
   switchMap(() => 
      forkJoin([
             this.moviesService.getTenRandomMovies(), 
             this.moviesService.getTenRandomMovies()
      ])
      .pipe(
        map(([response1,response2]) => {
          // do something
        }),
        map(movies => ({ type: '[Movies API] 10 Movies Loaded Success', payload: movies 
       })),
        catchError(() => EMPTY)
     ))
   )
 );