Redux

Question

有人可以帮我解决这个问题吗？我已经开始学习 React 和 Redux，但是我在配置 redux 上卡住了几天。

我假设当某事触发一个动作时，通过 reducers 函数堆栈的 redux 应该 return 一个代表我的应用程序状态的对象。不幸的是，它 return 是一个带有 { reducerName => reducer result } 的对象基本上意味着如果我有 4 个 reducer，函数 store.getState() return 就像

{
 'reducerOne': entireApplicationState
 'reducerTwo': entireApplicationState
 'reducerThree': entireApplicationState
 'reducerFour': entireApplicationState
}

如果有人能帮助我，我将不胜感激，因为我已经完成了所有的想法:)

这是我的application.js:

import React from 'react';
import ReactDom from 'react-dom';
import HomePage from 'root_views/home';
import {store} from 'root_services/redux/store';

class Application extends React.Component {

        constructor(props) {
            super(props);
        }

        render() {
            return (
                <HomePage/>
            )
        }

}

var Provider = React.createClass({
        childContextTypes: {
            store: React.PropTypes.object.isRequired
        },
        getChildContext: function () {
            return {store: this.props.store}
        },
        render: function () {
            return this.props.children;
        }
});


ReactDom.render(
        <Provider store={store}>
            <Application/>
        </Provider>,
        document.getElementById('application')
);

我的store.js

    import { createStore } from 'redux';

    import {rootReducer} from './reducers/container';

    export const store = createStore(
        rootReducer,
        window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__()
    );

我的container.js基本上包含了我所有的减速器

import {combineReducers} from 'redux';

// This is just the action label
import {DATA_EXCHANGE_LOAD} from 'root_services/redux/actions/container'

const initialState = {
    data_exchange: {},
}

function dataExchange(state = {}, action) {

    switch (action.type) {

        case DATA_EXCHANGE_LOAD:
            return Object.assign({}, state, {
                data_exchange:{'reducerOne':'dataExchange'}
            });
            break;

        default:
            return initialState;
            break;

    }
};

function testReducer(state = {}, action) {
    switch (action.type) {

        case DATA_EXCHANGE_LOAD:
            return Object.assign({}, state, {
                data_exchange:{'reducerTwo':'testReducer'}
            });
            break;

        default:
            return initialState;
            break;
    }

};

// Export the combined reducers
export const rootReducer = combineReducers({
    dataExchange,
    testReducer
});

这是触发事件的操作：

export function dataExchangeLoad(){
    return {
        type: DATA_EXCHANGE_LOAD,
    }
};

这是触发操作的我的组件：

import React from 'react'
import "../components/layouts/header/header.less";
import {dataExchangeLoad} from "root_services/redux/actions/container"

export default class HomePage extends React.Component {

    constructor(props, {store}) {
        super(props);
        store.dispatch(dataExchangeLoad());
        console.log(store.getState());
    }

    render() {
        return (
            <div>
                <h1>test</h1>
            </div>
        )
    }
};

HomePage.contextTypes = {
    store: React.PropTypes.object,
}

这是结果：

Object {dataExchange: Object, testReducer: Object}

Answer 1

正如评论中已经回答的那样 combineReducers 确实如此。如果你想链接 reducer 以便 action 将通过所有它们依次更新每个 reducer 中的状态，你可以使用 reduce-reducers。使用这个辅助函数可以做类似的事情（看起来这就是你想要实现的）：

import reduceReducers from 'reduce-reducers';

const reducer1 = (state = {}, action) => { 
  if (action.type === 'foo') {
    return ({ 
      ...state, 
      touchedBy: ['reducer1'],
    })
  }
  return state;
};

const reducer2 = (state = {}, action) => { 
  if (action.type === 'foo') {
    return ({ 
      ...state, 
      touchedBy: state.touchedBy.concat('reducer2'),
    })
  }
  return state;
};

const reducer = reduceReducers(reducer1, reducer2);

expect(reducer({}, { type: 'foo' }))
    .toMatchObject({ touchedBy: ['reducer1', 'reducer2'] });

Answer 2

万一有人在看，上面评论中提供的 link 已损坏。这个 link 有效并很好地解释了如何重命名来自你的减速器的状态。如果您不想阅读，请重命名您的减速器 import 或在您的 combineReducer.

中重命名它

示例 1：
import billReducer as billState from "./reducers";

示例 2：
const rootReducer = combineReducer({billState: billReducer});

Using combineReducers

Redux - 应用程序状态以 reducer 的名称作为键

Redux - application state has the name of reducer as key

javascript

reactjs

react-redux

reducers