NGRX：结合到选择

Question

我已经建立了这个IStore：

export interface IStore { 
    user: IUser; 
    sources: ISourceRedux; 
} 

其中IUser是：

export interface IUser { 
    id: string; 
    cname: string; 
    sname: string; 
    ... 
} 

和ISourceRedux是：

export interface ISourceRedux { 
    entities: { [key: string]: ISource }; 
    ids: Array<string>; 
    selectedIds: Array<string>; 
    editingSource: ISource; 
    defaultId: string; 
} 

所以，我创建这些选择器：

export const getSourcesState = (state: IStore) => state.sources; 
export const getSelectedIds = (sourceRdx: ISourceRedux) => sourceRdx.selectedIds; 
export const getSelectedSourceIds = createSelector(getSourcesState, fromSources.getSelectedIds); 

所以，到现在为止，以检查是否有用户登录我这样做：

this.store$ 
    .select(fromRoot.getUserState) 
    .filter(user => user.id != null && user.logged) 
    .do(user => this.store$.dispatch(...)) 
    ... 

现在我strugling用于获取用户信息和selectedSourceIds在同一时间，以便检查如果：

1. 用户登录（this.store$.select(fromRoot.getUserState)
2. 然后让所有selectedSourceIds（this.store.select(fromRoot.getSelectedSourceIds)）
3. 调度一个动作

我怎么能得到这个？

Answer 1

这是我的解决方案：

this.store$.combineLatest(
     this.store$.select(fromRoot.getUserEntity), 
     this.store$.select(fromRoot.getSelectedSourceIds), 
     (store, user, selectedSourceIds) => ({user: user, selectedSourceIds: selectedSourceIds}) 
    ) 
    .filter((proj) => proj.user.id != null && proj.user.logged) 
    .do((proj) => this.store$.dispatch({type: 'DELETE_CARDS', payload: {username: proj.user.username, tokens: proj.selectedSourceIds}})) 
    .take(1) 
    .subscribe(); 

我希望它是有用的。