如何在 redux-thunk 中使用 axios / AJAX

Question

我在我的操作中使用 axios。我需要知道这样做是否正确。

actions/index.js ==>

import axios from 'axios';
import types from './actionTypes'
const APY_KEY = '2925805fa0bcb3f3df21bb0451f0358f';
const API_URL = `http://api.openweathermap.org/data/2.5/forecast?appid=${APY_KEY}`;

export function FetchWeather(city) {
  let url = `${API_URL}&q=${city},in`;
  let promise = axios.get(url);

  return {
    type: types.FETCH_WEATHER,
    payload: promise
  };
}

reducer_weather.js ==>

import actionTypes from '../actions/actionTypes'
export default function ReducerWeather (state = null, action = null) {
  console.log('ReducerWeather ', action, new Date(Date.now()));

  switch (action.type) {
    case actionTypes.FETCH_WEATHER:
          return action.payload;
  }

  return state;
}

然后在里面组合它们 rootReducer.js ==>

import { combineReducers } from 'redux';
import reducerWeather from './reducers/reducer_weather';

export default combineReducers({
  reducerWeather
});

最后在我的 React 容器中调用它一些 js 文件...

import React, {Component} from 'react';
import {connect} from 'react-redux';
import {bindActionCreators} from 'redux';
import {FetchWeather} from '../redux/actions';

class SearchBar extends Component {
  ...
  return (
    <div>
      ...
    </div>
  );
}
function mapDispatchToProps(dispatch) {
  //Whenever FetchWeather is called the result will be passed
  //to all reducers
  return bindActionCreators({fetchWeather: FetchWeather}, dispatch);
}

export default connect(null, mapDispatchToProps)(SearchBar);

Answer 1

我猜你不应该（或者至少不应该）将承诺直接放在商店里：

export function FetchWeather(city) {
  let url = `${API_URL}&q=${city},in`;
  let promise = axios.get(url);

  return {
    type: types.FETCH_WEATHER,
    payload: promise
  };
}

这样您甚至不用使用 redux-thunk，因为它 return 是一个普通对象。实际上，redux-thunk 使您能够 return 稍后将评估的函数，例如，如下所示：

export function FetchWeather(city) {
  let url = `${API_URL}&q=${city},in`;
  return function (dispatch) { 
    axios.get(url)
      .then((response) => dispatch({
        type: types.FETCH_WEATHER_SUCCESS,
        data: response.data
      })).catch((response) => dispatch({
        type: types.FETCH_WEATHER_FAILURE,
        error: response.error
      }))
  }
}

确保正确设置 redux-thunk 中间件。我非常推荐阅读redux-thunk documentation and this amazing article以加深理解。

如何在 redux-thunk 中使用 axios / AJAX

How to use axios / AJAX with redux-thunk

javascript

reactjs

redux

redux-thunk

axios