如何从 redux-saga 函数中的 state/store 获取一些东西? [英] How to get something from the state / store inside a redux-saga function?

问题描述

如何在 saga 函数中访问 redux 状态?

How do I access the redux state inside a saga function?

简答:

import { select } from 'redux-saga/effects';
...
let data = yield select(stateSelectorFunction);

推荐答案

正如@markerikson 已经说过的，redux-saga 公开了一个非常有用的 API select() 在状态上调用 selector 以获取它的某些部分在传奇中可用.

As @markerikson already says, redux-saga exposes a very useful API select() to invoke a selector on the state for getting some part of it available inside the saga.

对于您的示例，一个简单的实现可能是:

For your example a simple implementation could be:

/*
 * Selector. The query depends by the state shape
 */
export const getProject = (state) => state.project

// Saga
export function* saveProjectTask() {
  while(true) {
    yield take(SAVE_PROJECT);
    let project = yield select(getProject); // <-- get the project
    yield call(fetch, '/api/project', { body: project, method: 'PUT' });
    yield put({type: SAVE_PROJECT_SUCCESS});
  }
}

除了@markerikson 建议的 doc 之外，还有一个非常D. Abramov 的优秀视频教程，解释了如何使用<代码>选择器与 Redux.另请查看 Twitter 上的这个有趣的帖子.

In addition to the suggested doc by @markerikson, there is a very good video tutorial by D. Abramov which explains how to use selectors with Redux. Check also this interesting thread on Twitter.

这篇关于如何从 redux-saga 函数中的 state/store 获取一些东西?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！