Error: Actions must be plain objects. Use custom middleware for async actions. in React Native

Question

我每次尝试发送我的操作时都会收到此错误：

Error: Actions must be plain objects. Use custom middleware for async actions.

我已经安装了 redux-thunk 并且没有异步操作，它正在运行。

商店配置：

import { applyMiddleware, createStore } from 'redux';
import thunk from 'redux-thunk';
import { createLogger } from 'redux-logger';
import { composeWithDevTools } from 'redux-devtools-extension';

import reducers from '../reducers/index';

const logger = createLogger();

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

UI:

...
import { connect } from 'react-redux';
import { getCities } from '../../actions/cities';
...
componentDidMount = async () => {
    try {
      const cities = await this.props.getCities();
      console.log(cities);
    } catch (error) {
      console.log(`errorhome: ${error}`);
    }
    SplashScreen.hide();
  }
...

const mapDispatchToProps = dispatch => ({
  changeNetworkStatus: () => dispatch(changeNetworkStatus),
  getCities: () => dispatch(getCities),
});

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

操作：

import database from '../config/utils';

export const GET_CITIES_START = 'GET_CITIES_START';
export const GET_CITIES_FINISHED = 'GET_CITIES_FINISHED';
export const GET_CITIES_ERROR = 'GET_CITIES_ERROR';

const getCititesStart = () => ({ type: GET_CITIES_START });
const getCititesFinished = cities => ({ type: GET_CITIES_FINISHED, cities });
const getCititesError = error => ({ type: GET_CITIES_ERROR, error });

export const getCitites = () => async (dispatch) => {
  dispatch(getCititesStart());
  try {
    const cities = [];
    const snap = await database.ref('cities').once('value');
    console.log('snap: ', snap);
    snap.forEach((element) => {
      const city = {
        city: element.key,
        coordinate: element.val().coordinate,
      };
      cities.push(city);
    });
    dispatch(getCititesFinished(cities));
  } catch (error) {
    dispatch(getCititesError(error));
  }
};

编辑：如果我也将 logger 添加到中间件，错误消息是这样的：

TypeError: Cannot read property 'type' of undefined

感谢您的帮助！

Answer 1

动作是 return 具有动作数据的对象的函数，该数据是具有 type 属性.

的对象

您正在像这样调度操作：

dispatch(getCities)

您应该像这样发送操作：

dispatch(getCities())

Error: Actions must be plain objects. Use custom middleware for async actions. in React Native

Error: Actions must be plain objects. Use custom middleware for async actions. in React Native

reactjs

react-native

redux

redux-thunk

react-redux