Question

我正在尝试从Firebase集合中获取数据，但出现错误，有人可以帮忙吗？我收到此错误

错误：找不到来自react-redux的上下文。如果您使用react-redux v6，则需要v3。。版本的react-redux-firebase。请查看v3迁移指南：

这是我的代码。

import React, { Component } from 'react'
import Notifications from './Notifications';
import ProjectList from '../projects/ProjectList';
import {connect} from 'react-redux';
import {firestoreConnect} from 'react-redux-firebase';
import {compose} from 'redux';
import { firebaseConnect, isLoaded, isEmpty } from 'react-redux-firebase'

class Dashboard extends Component {
render() {

return (
  <div className="dashboard container">
    <div className="row">
        <div className="col s12 m6"><ProjectList projects={this.props.projects}></ProjectList></div>
        <div className="col s12 m5 offset-m1"><Notifications></Notifications></div>
    </div>
  </div>
)
}
}
const mapStateToProps = (state) =>
{
  console.log(state);
 return ({projects:state.projectReducer.projects})
}
export default compose(firebaseConnect([
'projects'
]), connect(mapStateToProps)) (Dashboard)

我尝试了此导出，但存在相同的错误

export default compose(connect(mapStateToProps), firestoreConnect([
{collection:'project'}
])) (Dashboard)

这是我的package.json

{
"name": "myproject",
"version": "0.1.0",
"private": true,
"dependencies": {
"firebase": "^5.7.0",
"firedux": "^1.1.0",
"react": "^16.6.3",
"react-dom": "^16.6.3",
"react-redux": "^6.0.0",
"react-redux-firebase": "^2.2.5",
"react-router-dom": "^4.3.1",
"react-scripts": "2.1.1",
"redux": "^4.0.1",
"redux-firestore": "^0.6.0",
"redux-thunk": "^2.3.0"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": [
">0.2%",
"not dead",
"not ie <= 11",
"not op_mini all"
]
}

Answer 1

错误非常清楚，您正在使用react-redux-firebase：^2.2.5，而您需要使用v3，因为正在使用react-redux：^6.0.0。

您必须更新react-redux-firebase

Answer 2

如果您遵循某人的示例，而不是构建生产应用程序，则可以切换到react-redux 5.1.1。

只需在package.json中将"react-redux": "^6.0.0",更改为"react-redux": "^5.1.1",并运行npm install。

Answer 3

@kabanny以上是正确的。

如果您确实要使用支持上下文api的下一版react-redux-firebase，请自担风险。

npm install react-redux-firebase@next

还要签出migration guide

Answer 4

如果确实使用npm安装软件包。降级为react-redux-firebase@2.2.5和react-redux@5.1.1确实解决了我的问题。注意事项：如果在遵循某人的教程时遇到此类错误，建议您首先确认他们使用的依赖项版本。 npm会让您陷入困境。

反应读取Firebase的错误，

4 个答案: