触发多个动作并等待它们解析 RxJS/Redux Observables [英] Fire multiple actions and wait for them to resolve RxJS / Redux Observables

问题描述

我有一个动作，我想用它来初始化我的应用程序，我想为这个动作创建一个史诗，然后在这个动作的后面触发多个其他动作，等待它们全部完成，然后再触发另一个动作.我查看了其他问题，它与此非常相似 一个

I have an action that I want to use to initialise my app, I want to create an epic for this action and then fire multiple other actions off the back of this, wait for them to all complete and there fire another action. I had a look at other questions and it's pretty similar to this one

我已经尝试过这种方法，但对我来说，它不起作用，它会触发 APP_INIT 操作然后但未能触发序列中的任何其他操作.有人可以帮忙吗?

I've tried this approach and for me, it doesn't work, it fires the APP_INIT action then but then fails to fire any of the other actions in the sequence. Is anyone able to help?

import { of } from 'rxjs';
import { mergeMap, zip, concat, mapTo } from 'rxjs/operators';
import { ofType } from 'redux-observable';
import { firstAction, secondAction } from 'actions';

export default function appInit (action$) {
  return (
    action$.pipe(
      ofType('APP_INIT'),
      mergeMap(() =>
        concat(
          of(firstAction()),
          of(secondAction()),
          zip(
            action$.ofType('ACTION_ONE_COMPLETE'),
            action$.ofType('ACTION_TWO_COMPLETE')
          ).mapTo(() => console.log('complete'))
        )
      )
    )
  );
}

推荐答案

结果我的代码一开始还不错，主要原因是我从 导入了 concatrxjs/operators 当我应该直接从 rxjs 导入时，我花了几个小时才意识到，但现在它可以工作了.

Turns out my code was pretty much okay in the first instance, the main cause was that I was importing concat from rxjs/operators when I should have been importing from rxjs directly, it took me hours to realise but it now works.

下面的完整代码，可能对任何人都有帮助.

Full code below for anyone that it might help.

import { of, concat, zip } from 'rxjs';
import { mergeMap, map, take } from 'rxjs/operators';
import { ofType } from 'redux-observable';

import { appInitialisationComplete, APP_INITIALISATION } from 'client/actions/app/app';
import { actionOne, ACTION_ONE_COMPLETE } from 'client/actions/action-one/action-one';
import { actioTwo, ACTION_TWO_COMPLETE } from 'client/actions/action-two/action-two';

/**
 * appInitialisationEpic
 * @param  {Object} action$
 * @return {Object}
 */
export default function appInitialisationEpic (action$) {
  return (
    action$.pipe(
      ofType(APP_INITIALISATION),
      mergeMap(() =>
        concat(
          of(actionOne()),
          of(actioTwo()),
          zip(
            action$.ofType(ACTION_ONE_COMPLETE).pipe(take(1)),
            action$.ofType(ACTION_TWO_COMPLETE).pipe(take(1))
          )
            .pipe(map(() => appInitialisationComplete()))
        )
      )
    )
  );
}

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