如何使用 ngrx-router-store 在 ngrx 效果中获取路由参数？

Question

我有一个效果类，我想根据路由器参数 ID 加载详细信息

@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))
          )
        );
    })
  );

我想在payload中获取路由器参数，这样我就不用从组件中传递payload，而是直接从效果类中获取。

Answer 1

如果您已经有一个选择器映射到您的应用路由器状态：

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

然后您可以使用rxjs/operators 中的withLatestFrom 从路由器状态获取参数，并可能将它们与您的操作的有效负载合并，如下所示：

@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)))
        );
    })
);