角6通过效应rxjs参数

Question

你好，如何将有效载荷参数从mergeMap传递给switchMap？我在clientservice.checkValideName中使用它，但希望将它传递给sendMessage(data，payload1)。

我试过很多东西，但都没有用。(另一次合并或映射checkValideName的结果以注入有效载荷)

@Effect()  CheckValidatedName$ = this.actions$.pipe(
ofType(CheckValidatedActionTypes.VALIDATED_NAME),
map((action: ValidatedNameAction) => action.payload),
withLatestFrom(this.store.select(fromRoot.selectors.getCurrentClient)),
mergeMap(([payload, client]) =>
  this.clientService.checkValideName(client.uuid, payload[0])
),
map((result: any) => result.data),
switchMap((data: boolean) => {
  return of(this.sendMessage(data))
}),
catchError((res: any) => this.catchResponseError(res))

)；

Answer 1

您可以将它作为mergeMap响应的一部分返回--这是管道中丢失它的地方：

mergeMap([payload, client] => {
  // now we have it, and after returning clientServiceCheck, we lose the reference to it
  return this.clientService(checkValidname(client, payload));
})
.map(result => result.data)

相反，您希望返回结果和数据，大致如下所示：

mergeMap([payload, client] => {
  // now we have it, and after returning clientServiceCheck, we lose the reference to it
  return mergeMap(() => [
    of(payload)
    this.clientService(checkValidname(client, payload)),
  ]);
})
.map([payload, result] => {
  // now we have both
})