如何从redux-saga函数中的状态/商店中获取内容？ [英] How to get something from the state / store inside a redux-saga function?

问题描述

如何在传奇功能中访问redux状态？

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

简答：

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

推荐答案

正如@markerikson所说， redux-saga 公开了一个非常有用的API select（） 在状态中调用选择器，以便在saga中获取部分内容。

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});
  }
}

除了建议的 doc ，有一个很好的视频教程解释了如何使用选择器终极版。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.

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