名为'[DEFAULT]'的Firebase应用程序已存在REACT [英] Firebase App named '[DEFAULT]' already exists REACT
问题描述
我是React的初学者,目前我尝试将我的第一个应用程序连接到Firebase数据库。
I'm a beginner in React and at the moment I try to connect my first app to a Firebase database.
我有两个文件。第一个是config.js文件,其中存储了有关数据库的所有信息,如下所示:
I have two files for that. The first, is a config.js file where all the information about the database are stored, like this:
`export default {
apiKey: "***",
authDomain: "***",
databaseURL: "***",
projectId: "***",
storageBucket: "***",
messagingSenderId: "***"
};`
和我的另一个文件,App.js:
And my other file, App.js:
`import React, { Component } from 'react';
import './App.css';
//Firebase
import * as firebase from 'firebase';
import config from 'firebase';
class App extends Component {
constructor () {
super()
this.state = { loading: true }
firebase.initializeApp(config)
}
componentWillMount () {
const capsRef = firebase.database().ref('Capsules')
capsRef.on('value', snapshot => {
this.setState({
Capsules: snapshot.val(),
loading: false
})
})
}
render () {
if (this.state.loading) {
return (
<p>Je suis en train de charger.</p>
)
}
const capsRef = Object.keys(this.state.tweets).map(key => {
return <p key={key}>{this.state.Capsules[key].designation}</p>
})
return (
<div>
<h1>Test</h1>
</div>
)
}
}
export default App;`
因此,当我刷新浏览器时,我收到一条错误消息:Firebase:Firebase App命名'[DEFAULT]'已经存在(app / duplicate-app)。
So, when I refresh my browser, I have an error message : "Firebase: Firebase App named '[DEFAULT]' already exists (app/duplicate-app)."
任何人都可以帮助我吗?
现在已经过了一个星期,我正在寻找自己的解决方案。
Can anyone help me ? It's been a week now that I'm looking for a solution by myself.
推荐答案
很难说没有看到您的代码,但您可以尝试:
Hard to tell without seeing your code, but you could try:
if (!firebase.apps.length) {
firebase.initializeApp(config);
}
。
这篇关于名为'[DEFAULT]'的Firebase应用程序已存在REACT的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!