javascript - 如何通过钩子(Hook)使用Redux-Saga来调用API

我正在尝试使用Redux-saga中间件来避免异步函数错误，我正在使用React Hooks，我连接了Redux-Saga并执行了功能*产生函数，但是我不知道为什么它没有读取我的操作来拦截它它给了我同样的错误：


  错误：动作必须是普通对象。使用自定义中间件进行异步操作。


码：
Store.js

import createSagaMiddleware from 'redux-saga';
import rootReducer from './RootReducer'
import {watchFetchImages} from '../middleware/saga';

const sagaMiddleware = createSagaMiddleware();
const store = createStore(
    rootReducer,
    applyMiddleware(sagaMiddleware)
  );
  sagaMiddleware.run(watchFetchImages);

export default store;

Actions.js

import axios from 'axios';
import { GetCategories } from './actionTypes'
import {GetImages} from './actionTypes'

export function fetchCategories() {
    var url = 'http://localhost:4000/all_categories';
    return (dispatch) => {
        return axios.get(url).then((res) => {
            dispatch({
                type: GetCategories,
                payload: res.data
            })
        })
    }
}


export function fetchImages(){
    var url ='/all_categories';
    return(dispatch) => {
        return axios.get(url).then((res)=>{
            dispatch({
                type:GetImages,
                payload:res.data
            })

        })
    }
}

Reducers.js

import { GetCategories , GetImages } from "../redux/actions/actionTypes"
const initialState = {
    categories: [],
    images:[]
};

const rootReducer = (state = initialState, action) => {
    switch (action.type) {
        case GetCategories:
            return {...state, categories: state.categories.concat(action.payload)}
        case GetImages:
            return{...state,images:action.payload}
        default:
        return state;

    }
};
export default rootReducer;

Saga.js

import {takeEvery,delay} from 'redux-saga/effects'



function* getImagesAsync(){
    yield delay(4000);
    console.log('api called')


}
export function* watchFetchImages(){

    yield takeEvery("GetImages",getImagesAsync);


}

Home.js我在哪里调用redux动作

const  HomePage = props => {



    useEffect(()=>props.getImages())
    console.log(props)

 const mapStateToProps = (images) => ({
        images
    })
    const mapDispatchToProps= dispatch =>({

        getImages: () => dispatch(fetchImages())
    })

export default connect(mapStateToProps,mapDispatchToProps)(HomePage);

Index.js

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import { Provider } from "react-redux";
import store from '../src/redux/store';
import * as serviceWorker from './serviceWorker';

ReactDOM.render(<Provider store={store}><App /></Provider>, document.getElementById('root'));

任何人都可以帮助我吗？

最佳答案

几周前，我刚刚进行了一个项目，该项目使用redux-saga处理websockets，但我遇到了几乎类似的问题。 SageMidddleware确实适用于传奇功能，但要将功能用于我使用redux-thrunk的操作。小例子：

import {
	createStore,
	applyMiddleware,
	compose
} from "redux";

import createSagaMiddleware from 'redux-saga';
import thunk from "redux-thunk";

import reducer from '../reducers';

const storeEnhancers =  window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;

const store = createStore(
	reducer,
	(localStorage['storage']) ? JSON.parse(localStorage['storage']) : {},
	storeEnhancers(applyMiddleware(sagaMiddleware, thunk))
);

希望这对您有所帮助。