[英]angular: ngrx effects not firing
我已經開發了一些實現 Redux (NgRx) 的 Angular 應用程序。 我無法弄清楚我當前項目的問題。
行動:
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) { }
}
減速器:
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$', )),
mergeMap((action: userActions.GetUserFromStorage) =>
this.storageService.getItem(StorageKeys.USER).pipe(
map((user: User | null) =>
new userActions.GetUserFromStorageSuccess(user)),
catchError((error: string) =>
of(new userActions.GetUserFromStorageFail(error)))
))
);
在 auth.service.ts 中,我訂閱了 Store 並分派了一些操作。
this.store.dispatch(new userActions.GetUserFromStorage());
this.store.pipe(select(userReducer.getUser)).subscribe(
(user: User) => {
console.log('user TEST: ', user);
this.user = user;
}
);
我安裝了 ReduxDevTools。 GetUserFromStorage 操作會觸發,但不會觸發 getUserFromStorage$ 效果。 “user TEST”的 console.logged 值顯示“user”為“null”。 任何想法,任何人? 謝謝你。
確保您確實“激活”了它們。
注射效果:
@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
])
]
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