javascript - React 组件无法从 API 映射和渲染数组中的数据

Question

我使用react、redux、axios 和redux-thunk 来处理异步。

我有一种感觉，解决方案将是显而易见的，但由于某种原因，我无法映射用户数组(从本地express/node api 检索)并渲染每个用户。用户的信息将被登录到控制台，但...

<p>NO USERS FOUND</p> 

...组件被渲染到屏幕上。

这是我的仓库:https://github.com/tedjames/reduxTest

这是我的组件的样子:

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

class App extends Component {
  componentWillMount() {
    console.log(this.props);
    this.props.getUsers();
  }

  render() {
    if (this.props.users[1]) {
      this.props.users.map((user) => {
        console.log("USER FOUND!");
        console.log(user.email);
        return <p key={user.id}>USER FOUND: {user.email}</p>
      });
    } else {
      return <p>NO USERS FOUND</p>
    }
  }
}

const mapStateToProps = state => {
  return {
    users: state.admin.users
  };
};

export default connect(mapStateToProps, { getUsers })(App);

这是我使用 axios 来获取用户的操作:

import axios from 'axios'
import { GET_USERS } from './types'

export const getUsers = () => {
  return (dispatch) => {
    axios.get('http://localhost:3090/users')
      .then(res => {
        console.log("<-- // DATA RECEIVED FROM SERVER // --> ");
        console.log(res);
        dispatch({ type: GET_USERS, payload: res.data })
      })
      .catch(({ response }) => {
        console.log("// ERROR RECEIVED FROM SERVER //");
        console.log(response);
      });
  }
};

This is what my console outputs

Answer 1

您必须在 render 中返回数组(并将其包装在某个标记中):

return (
  <div>{ this.props.users.map((user) => {
      console.log("USER FOUND!");
      console.log(user.email);
      return <p key={user.id}>USER FOUND: {user.email}</p> }
  </div> 
 );