"Actions must be plain objects. Use custom middleware for async actions." 和 react/redux

Question

我遇到了这个错误，并花了最后几个小时试图解决这个问题。我查看了所有看似重复的问题 - 但它们并没有解决问题。

在我的 react/redux 应用程序中，当我在我的一个操作中发出 ajax 请求时，它会抛出此错误： Uncaught Error: Actions must be plain objects. Use custom middleware for async actions.

我创建的商店如下所示：

import { composeWithDevTools } from 'redux-devtools-extension';
import reducers from './reducers';
import thunkMiddleware from 'redux-thunk';
import { applyMiddleware, createStore } from 'redux';

export default createStore(reducers, composeWithDevTools(
 applyMiddleware(thunkMiddleware)
));

相关操作如下所示：

import axios from 'axios';

export const VEHICLE_LOOKUP = 'VEHICLE_LOOKUP';
export const VEHICLE_LOOKUP_SUCCESS = 'VEHICLE_LOOKUP_SUCCESS';
export const VEHICLE_LOOKUP_FAILURE = 'VEHICLE_LOOKUP_FAILURE';

export function fetchVehicleLookup(vrm: string, jwt: string) {
 return function (dispatch) {
  dispatch(requestVehicleLookup());

  axios.create({
   timeout: 4000,
  })
   .post('/*api url*', {
    action: '*method*',
    body: { vrm },
   })
   .then(response => response.data)
   .then(json => dispatch(receiveVehicleData(json)))
   .catch(error => dispatch(receiveVehicleDataFailure(error)));
 };
}

function requestVehicleLookup() {
 return { type: VEHICLE_LOOKUP };
}

function receiveVehicleData(payload: object) {
 return { type: VEHICLE_LOOKUP_SUCCESS, payload };
}

function receiveVehicleDataFailure(error: object) {
 return { type: VEHICLE_LOOKUP_FAILURE, error };
}

我的包版本是：

"axios": "^0.16.0",
"react": "^15.4.2",
"react-addons-css-transition-group": "^15.5.0",
"react-addons-transition-group": "^15.5.0",
"react-dom": "^15.4.2",
"react-hot-loader": "^3.0.0-beta.6",
"react-redux": "^5.0.3",
"react-router": "^4.0.0",
"react-router-dom": "^4.0.0",
"redux": "^3.6.0",
"redux-devtools-extension": "^2.13.0",
"redux-promise": "^0.5.3",
"redux-promise-middleware": "^4.2.0",
"redux-thunk": "^2.2.0",

Answer 1

第一个想法是你的 fetchVehicleLookup 动作很糟糕，因为你要返回 axios 而不是在内部调度。

export function fetchVehicleLookup(vrm: string, jwt: string) {
    return function (dispatch) {
        dispatch(requestVehicleLookup());

        axios.create({
            timeout: 4000,
        })
            .post('/*api url*', {
                action: '*method*',
                body: { vrm },
            })
            .then(response => response.data)
            .then(json => dispatch(receiveVehicleData(json)))
            .catch(error => dispatch(receiveVehicleDataFailure(error)));
    };
}

只需删除您操作中的 return 语句，因为它会返回 axios 表示的任何对象，我想这将是某种形式的 Promise.

第二个想法可能与您的商店设置有关，因为听起来 thunk 实际上并没有发挥作用。

Answer 2

我设法弄明白了 - 在与@Glitch100 聊了很长时间之后（谢谢！）。我需要 return 在创建 axios 承诺后立即调度 requestVehicleLookup。像这样：

export function fetchVehicleLookup(vrm: string, jwt: string) {
 return function (dispatch) {
  axios.create({
   timeout: 4000,
  })
   .post('/*api url*', {
    action: '*method*',
    body: { vrm },
   })
   .then(response => response.data)
   .then(json => dispatch(receiveVehicleData(json)))
   .catch(error => dispatch(receiveVehicleDataFailure(error)));
      
      
  return dispatch(requestVehicleLookup());
 };
}

"Actions must be plain objects. Use custom middleware for async actions." 和 react/redux

"Actions must be plain objects. Use custom middleware for async actions." with react/redux

reactjs

redux

react-redux

axios

redux-thunk