reactjs - 带react/redux的"Actions must be plain objects. Use custom middleware for async actions."

我遇到了此错误，并花了最后几个小时来尝试解决。我查看了所有看起来都是重复的问题-但它们不能解决问题。

在我的react/redux应用程序中，当我在其中一项操作中发出ajax请求时，它会抛出此错误:Uncaught Error: Actions must be plain objects. Use custom middleware for async actions.
我的商店创建如下:

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)
));

相关的reducer看起来像这样:

import * as actions from './../../actions/tools/vehicle-lookup';

const defaultState = {
	vrm: void 0,
	isLoading: false,
	response: void 0,
	error: void 0,
};

export default function (state = defaultState, action) {
	switch (action.type) {
		case actions.VEHICLE_LOOKUP:
			return { ...state, isLoading: true, vrm: action.vrm };

		case actions.VEHICLE_LOOKUP_SUCCESS:
			return { ...state, isLoading: false, payload: action.payload, error: void 0 };

		case actions.VEHICLE_LOOKUP_FAILURE:
			return { ...state, isLoading: false, error: action.error, response: void 0 };

		default: return state;
	}
}

相关 Action 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 };
}

我的软件包版本是:

"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",

最佳答案

首先想到的是，您的fetchVehicleLookup Action 很痛苦，因为您返回的是axios，而不仅仅是在内部进行调度。

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)));
    };
}

只需删除操作中的return语句，因为它返回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实际上没有用。

关于reactjs - 带react/redux的"Actions must be plain objects. Use custom middleware for async actions."，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/43328103/