问NGRX在路由器保护中的应用

EN

  outputGrp$ = this.store.pipe(select(selectOutputGroup));
  inputGrp$ = this.store.pipe(select(selectInputGroup));
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return <Observable<boolean>>this.store.select(selectGroupsLoaded).pipe(
      map(loaded => {
        if(!loaded)
          this.store.dispatch(loadMainCanvas());
        return loaded;
      }),
      filter(loaded => !!loaded),
      take(1),
      withLatestFrom(this.outputGrp$), //Get Output Group ID
      tap(([loaded, og]) => this.outputGroupId = <string>og?.id),
      filter(loaded => !!loaded),
      take(1),
      map((data) => data[0]),
      withLatestFrom(this.inputGrp$), //Get Input Group ID
      tap(([loaded, ig]) => this.inputGroupId = <string>ig?.id),
      filter(([loaded, ig]) => !!loaded),
      take(1),
      //THIS NEVER GETS EVALUATED AGAIN AFTER STORE IS UPDATED FROM CALL BELOW!!!
      withLatestFrom(this.store.select(selectInputGroupProcessorsLoaded)), //See if Input Group Processors Loaded
      map(([l1, loaded]) => {
        if(!loaded)
          this.store.dispatch(loadProcessorsForGroup({groupId: this.inputGroupId, groupType: 'input'}));
        return loaded;
      }),
      filter(loaded =>!!loaded),
      take(1),
      // GET: ERROR Error: Uncaught (in promise): EmptyError: no elements in sequence
}