ThomasBurleson

NgRx State Management with TicketFacade

Facades are a programming pattern in which a simpler public interface is provided to mask a composition of internal, more-complex, component usages.

When writing a lot of NgRx code - as many enterprises do - developers quickly accumulate large collections of actions and selectors classes. These classes are used to dispatch and query [respectively] the NgRx Store.

Using a Facade - to wrap and blackbox NgRx - simplifies accessing and modifying your NgRx state by masking internal all interactions with the Store, actions, reducers, selectors, and effects.

For more introduction, see Better State Management with Ngrx Facades

vespertilian

  @Effect()
  selectAndLoadStore$: Observable<Action> = this.actions$
    .ofType(storeActions.SELECT_AND_LOAD_STORE)
    .withLatestFrom(this.store.select(ngrx.storeState))
    .map(([action, storeState]) => [action.payload, storeState])
    .switchMap(([storeName, storeState]) => {
      const existsInStore = Boolean(storeState.urlNameMap[storeName]);
      return Observable.if(
        () => existsInStore,
        Observable.of(new storeActions.SetSelectedStore(storeName)),