Angular NGRX为什么减速器对从效应中发出的动作不作出反应？

NGRX实现的一个功能包括

两个动作

export class UpdateWordListAction implements Action {
    static readonly TYPE = 'UPDATE_WORD_LIST';
    readonly type = "UPDATE_WORD_LIST";
    constructor() {};
}
export class WordListLoadedSuccessAction implements Action {
    readonly words: Word[];
    static readonly TYPE = 'WORD_LIST_LOADED_SUCCESS';
    readonly type = "WORD_LIST_LOADED_SUCCESS";
    constructor(words: Word[]) {};
}

客户端

this.store.dispatch(new UpdateWordListAction());

@Effect()
testEffect$ = this.actions$.pipe(
   ofType(UpdateWordListAction.TYPE), 
   tap(console.log), // Runtime: UpdateWordListAction {type: "UPDATE_WORD_LIST"}
   switchMap(() => this.wordService.getWordList()), 
   tap(console.log),  // Runtime: (2) [{…}, {…}]
   map(words => new WordListLoadedSuccessAction(words)),
   catchError(() => EMPTY));

效果

this.store.dispatch(new UpdateWordListAction());

@Effect()
testEffect$ = this.actions$.pipe(
   ofType(UpdateWordListAction.TYPE), 
   tap(console.log), // Runtime: UpdateWordListAction {type: "UPDATE_WORD_LIST"}
   switchMap(() => this.wordService.getWordList()), 
   tap(console.log),  // Runtime: (2) [{…}, {…}]
   map(words => new WordListLoadedSuccessAction(words)),
   catchError(() => EMPTY));

和减速器

export const reducers = combineReducers<AppState, any>({
    words(state = initialAppState.words, action: WordListLoadedSuccessAction) {
        console.log(action); // Never reached!
        return action.words;
    }
  });

导出常量减速机=组合减速机({
words（state=initialAppState.words，action:wordListedSuccessAction）{
console.log（操作）；//从未到达！
返回动作。单词；
}
});

---

我不明白这个减速机为什么不工作。请帮助找出问题所在。

您不使用现代NgRx方法（如

createAction

和

createReducer

）的任何原因？后者允许您在上使用，以方便操作减速器的设置。您的减速器是否已在相应的模块中注册？