How to get route params inside ngrx effects using ngrx-router-store?

Question

I am having effect class where I want to load details based on router params ID

@Effect()
  getDetails$ = this.actions$.ofType(DetailActions.GET_DETAILS).pipe(
    map(toPayload),
    switchMap(payload => {
      return this.detailService
        .getDetail(payload)//I want router params here in payload
        .pipe(
          map(detail=> new DetailActions.GetDetailSuccess(detail)),
          catchError(error =>
            Observable.of(new DetailActions.GetDetailFail(error))
          )
        );
    })
  );

I want to get router params in payload, so that I don't have to pass payload from component but directly get it from effects class.

Answer 1

If you already have a selector mapping to your app router state:

export const getRouterState = createFeatureSelector<
  fromRouter.RouterReducerState<RouterStateUrl>
>('router');

Then you can use withLatestFrom from rxjs/operators to get your params from the router state and maybe merge them with your action's payload, something like what follows:

@Effect()
getDetails$ = this.actions$.pipe(
    ofType(DetailActions.GET_DETAILS),
    withLatestFrom(
        this.store.select(fromRoot.getRouterState),
        (action, router) => {
            // do your logic here
            // and return a newPayload:
            return {
                id: router.state.params.id,
                payload: action.payload
            }
        }
    ),
    switchMap(newPayload => {
        return this.detailService
        .getDetail(newPayload)
        .pipe(
            map(detail=> new DetailActions.GetDetailSuccess(detail)),
            catchError(error => Observable.of(new DetailActions.GetDetailFail(error)))
        );
    })
);