Chain Actions in an Effect in @ngrx

Question

I am having some trouble chaining actions one after the other in an Effect that makes an HTTP-request.

Here's the Effect code:

export class UserEffects {

    @Effect()
    update$: Observable<Action> = this.actions$.ofType(user.USERCHANGE).pipe(
        switchMap(data => this.authService.login(data['payload'])),
        map(userInfo => new UserChangedAction(userInfo)),
        tap(() => this.store.dispatch(
             new LoginStateChangeAction(localStorage.getItem('token')))
        )
    );

    constructor(private authService: AuthService, private actions$: Actions,
        public store: Store<fromRoot.State>) {}
}

The problem is both the actions are being called simultaneously. The LoginStateChange action depends on UserChanged action to complete.

How can I achieve this?

Thanks!

Answer 1

You can return multiple actions as explained in Austin's post: Dispatching Multiple Actions from NGRX Effects

@Effect()
update$ = this.actions$.ofType(user.USERCHANGE).pipe(
  switchMap(data => this.authService.login(data['payload'])),
  switchMap(userInfo => [
    new UserChangedAction(userInfo),
    new LoginStateChangeAction(localStorage.getItem('token')),
  ])
);