NGRX return 数组生效

Question

当我尝试运行下面的代码时：

functionMap = {
[ActionTypeEnum.TYPE_FIRST.toLowerCase()]:[getInitialDataStatus({statusType: 'disabled'}),fetchImportantDataFirst()],
[ActionTypeEnum.TYPE_SECOND.toLowerCase()]:[getInitialDataStatus({}),
                        fetchImportantDataSecond()],
[ActionTypeEnum.TYPE_THIRD.toLowerCase()]:[getInitialDataStatus({}),
                        fetchImportantDataThidr()]
}

 startMultpileActionDepensOnType$ = createEffect(() => this.actions$.pipe(
        ofType(startMultpileActionDepensOnType),
        withLatestFrom(this.store$.select(selectTypeActions)),
        map(([action, select]) => {
                const actionType = select.type.toLowerCase();
                return this.unctionMap[actionType]

            }
        )
    ));

我收到关于以下内容的错误：

TS2322: Type 'Observable<TypedAction<string>[]>' is not assignable to type 'Observable<Action>'. Property 'type' is missing in TypedAction<string>[].

但是当我改为：functionMap:{},

我收到错误：

Action must have a type property

Answer 1

在 effect 中，要检索多个动作，所以动作数组，您必须使用 switchMap 运算符：

load$ = createEffect(() => this.actions$.pipe(
  ofType(actions.load),
  switchMap(action => [
    actions.loadItems(),
    actions.loadHistory();
  ])
))

因此，在您的情况下，functionMap returns 一系列操作：

startMultipleActionDepensOnType$ = createEffect(() => this.actions$.pipe(
  ofType(startMultipleActionDepensOnType),
  withLatestFrom(this.store$.select(selectTypeActions)),
  switchMap(([action, select]) => {
    const actionType = select.type.toLowerCase();
    return this.functionMap[actionType];
  })
));

NGRX return 数组生效

NGRX return array in effect

effect

rxjs

typescript

ngrx

angular