angular - 如何使用 ngrx 和 effects 订阅 Action 成功回调

Question

我正在尝试做一些简单的事情 - 在一些实体保存之后(使用 http 请求)我想导航回列表路线。问题是:如何订阅成功的 Action (或者可能是 reducer 或 effect？)

这是我的操作代码:

static SAVE_POST = '[POST] Save POST';
savePOST(Post): Action {
    return {
        type: PostActions.SAVE_POST,
        payload: Post
    };
}

static SAVE_POST_SUCCESS = '[POST] Save POST Success';
savePOSTSuccess(Post): Action {
    console.log('action: savePostSuccess')
    return {
        type: PostActions.SAVE_POST_SUCCESS,
        payload:Post
    };
}

我正在使用效果器:

   @Effect() savePost$ = this.update$
    .ofType(PostActions.SAVE_POST)
    .map(action => action.payload)
    .switchMap(post => this.svc.savePost(post))
    .map(post => this.postActions.savePOSTSuccess(post));

reducer :

const initialState: PostListState = [];

export default function (state = initialState, action: Action): PostListState {
    switch (action.type) {
        case PostActions.LOAD_POST_SUCCESS: {
            return action.payload;
        }
        case PostActions.SAVE_POST_SUCCESS: {
            console.log('SavePOST SUCCESS',action.payload)
            let index = _.findIndex(state, {_id: action.payload._id});
            if (index >= 0) {
                return [
                    ...state.slice(0, index),
                    action.payload,
                    ...state.slice(index + 1)
                ];
            }
            return state;
        }
        default: {
            return state;
        }
    }
}

在我的组件中，我想订阅成功回调:

   handlePostUpdated($event) {
     this.post = this.code;
     let _post: Post = Object.assign({}, { _id: this.id, name: this.name, text: this.post });
     this.store.dispatch(this.postActions.savePOST(_post)); //not have "subscribe" method

  }

感谢帮助

Answer 1

您也可以订阅组件中的操作:

[...]
import { Actions } from '@ngrx/effects';
[...]

@Component(...)
class SomeComponent implements OnDestroy {
    destroyed$ = new Subject<boolean>();

    constructor(updates$: Actions) {
        updates$.pipe(
           ofType(PostActions.SAVE_POST_SUCCESS),
           takeUntil(this.destroyed$)
        )
        .subscribe(() => {
           /* hooray, success, show notification alert etc.. */
        });
    }

    ngOnDestroy() {
        this.destroyed$.next(true);
        this.destroyed$.complete();
    }
}