angular：ngrx 效果未触发

Question

我开发了几个 Angular 实现了 Redux (NgRx) 的应用程序。我无法弄清楚我当前项目的问题。

操作：

export class GetUserFromStorage implements Action {
  readonly type = UserActionTypes.GetUserFromStorage;
}

export class GetUserFromStorageSuccess implements Action {
  readonly type = UserActionTypes.GetUserFromStorageSuccess;
  constructor(public payload: User | null) { }
}

export class GetUserFromStorageFail implements Action {
  readonly type = UserActionTypes.GetUserFromStorageFail;
  constructor(public payload: string) { }
}

减速器：

case UserActionTypes.GetUserFromStorageSuccess:
    return {
        ...state,
        user: action.payload,
        error: ''
    };

case UserActionTypes.GetUserFromStorageFail:
    return {
        ...state,
        error: action.payload
    };

效果：

@Effect() getUserFromStorage$:
Observable<userActions.GetUserFromStorageSuccess | userActions.GetUserFromStorageFail>
    = this.actions$.pipe(
        ofType(userActions.UserActionTypes.GetUserFromStorage),
        tap(() => console.log('GETUserToStorage$', )),
        mergeMap((action: userActions.GetUserFromStorage) =>
            this.storageService.getItem(StorageKeys.USER).pipe(
                map((user: User | null) =>
                    new userActions.GetUserFromStorageSuccess(user)),
                catchError((error: string) =>
                    of(new userActions.GetUserFromStorageFail(error)))
                ))
            );

在 auth.service.ts 中，我订阅了商店并发送了一些操作。

this.store.dispatch(new userActions.GetUserFromStorage());

this.store.pipe(select(userReducer.getUser)).subscribe(
    (user: User) => {
        console.log('user TEST: ', user);
        this.user = user;
    }
);

我安装了 ReduxDevTools。 GetUserFromStorage 操作触发，但它不会触发 getUserFromStorage$ 效果。 'user TEST' 的 console.logged 值表明 'user' 是 'null'。任何想法，任何人？谢谢。

Answer 1

确保你确实 "activated" 他们。

可注射的效果：

@Injectable()

export class FooEffects {

  @Effect() getUserFromStorage$:
Observable<userActions.GetUserFromStorageSuccess | userActions.GetUserFromStorageFail>
    = this.actions$.pipe(
        ofType(userActions.UserActionTypes.GetUserFromStorage),
        tap(() => console.log('GETUserToStorage$', )),
        mergeMap((action: userActions.GetUserFromStorage) =>
            this.storageService.getItem(StorageKeys.USER).pipe(
                map((user: User | null) =>
                    new userActions.GetUserFromStorageSuccess(user)),
                catchError((error: string) =>
                    of(new userActions.GetUserFromStorageFail(error)))
                ))
            );
}

app.module.ts:

import {EffectsModule} from '@ngrx/effects';

imports: [
  EffectsModule.forRoot([
    FooEffects
  ])
]

angular：ngrx 效果未触发

angular: ngrx effects not firing

angular

ngrx

ngrx-effects