如何使用ngrx和效果订阅动作成功回调

Question

我正在尝试做一些简单的事情 - 在一些实体保存后(使用http请求)我想导航回列表路由.问题是:如何订阅成功动作(或者可能是减速器或效果？)

这是我的行为代码:

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:

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

减速器:

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

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

Answer 2

基于此:https://netbasal.com/listening-for-actions-in-ngrx-store-a699206d2210进行了一些小修改,因为ngrx 4已经没有Dispatcher了,但是ActionsSubject:

import { ActionsSubject } from '@ngrx/store';
import { ofType } from "@ngrx/effects";

subsc = new Subcription();

constructor(private actionsSubj: ActionsSubject, ....) { 
  this.subsc = actionsSubject.pipe(
     ofType('SAVE_POST_SUCCESS')
  ).subscribe(data => {
     // do something...
  });
}

ngOnDestroy() {
  this.subsc.unsubscribe();
}