CODEWITHSUNDEEP
angularngrxngrx-storengrx-effectsngrx-store-4.0
Borad Akash
Borad Akash

Reputation: 804

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

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.

Upvotes: 12

Views: 14123

Answers (2)

Rafique Mohammed
Rafique Mohammed

Reputation: 3796

NgRx already provides loads of selectors for you to use it. Please Refer NgRx Docs (https://v8.ngrx.io/guide/router-store/selectors)

import { getRouterSelectors, RouterReducerState } from '@ngrx/router-store';
import { createFeatureSelector } from '@ngrx/store';

export const ROUTER_FEATURE_KEY = 'router';

export const selectRouter =
    createFeatureSelector<RouterReducerState>(ROUTER_FEATURE_KEY);

export const {
    selectCurrentRoute, // select the current route
    selectFragment, // select the current route fragment
    selectQueryParams, // select the current route query params
    selectQueryParam, // factory function to select a query param
    selectRouteParams, // select the current route params
    selectRouteParam, // factory function to select a route param
    selectRouteData, // select the current route data
    selectUrl, // select the current url
} = getRouterSelectors(selectRouter);

To Use it in your effects, simply do the below (taking from above code example) :

    this.actions$.pipe(
    ...
    concatLatestFrom(
        this.store.select(selectQueryParams)
    ),
switchMap((queryParams) => { // <--- queryParams from selectors
    return this.detailService
    .getDetail(queryParams) // <-- use it for any logic
    ...
    );
})
);

Upvotes: 2

Salem Ouerdani
Salem Ouerdani

Reputation: 7886

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)))
        );
    })
);

Upvotes: 15

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