设置Firebase后，出现以下错误：客户端无权访问所需数据

Question

我只想将firbase安装为数据库，但不断收到此错误：

ERROR Error: permission_denied at /courses: Client doesn't have permission to access the desired data.
    at errorForServerCode (index.cjs.js:647)
    at onComplete (index.cjs.js:9114)
    at Object.onComplete (index.cjs.js:12681)
    at index.cjs.js:11797
    at PersistentConnection.push../node_modules/@firebase/database/dist/index.cjs.js.PersistentConnection.onDataMessage_ (index.cjs.js:12052)
    at Connection.push../node_modules/@firebase/database/dist/index.cjs.js.Connection.onDataMessage_ (index.cjs.js:11337)
    at Connection.push../node_modules/@firebase/database/dist/index.cjs.js.Connection.onPrimaryMessageReceived_ (index.cjs.js:11331)
    at WebSocketConnection.onMessage (index.cjs.js:11232)
    at WebSocketConnection.push../node_modules/@firebase/database/dist/index.cjs.js.WebSocketConnection.appendFrame_ (index.cjs.js:10837)
    at WebSocketConnection.push../node_modules/@firebase/database/dist/index.cjs.js.WebSocketConnection.handleIncomingFrame (index.cjs.js:10887)

app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AngularFireModule } from 'angularfire2';
import { AngularFireDatabaseModule } from 'angularfire2/database';
import { environment } from '../environments/environment';

  imports: [
    BrowserModule,
    AngularFireModule.initializeApp(environment.firebase),
    AngularFireDatabaseModule,
  ]

app.component.ts

export class AppComponent implements OnInit {
  courses: Observable<any>;

  constructor(private _db: AngularFireDatabase) {}

  ngOnInit() {
    this.courses = this._db.list('/courses').valueChanges();
  }
}

刚安装

npm install firebase angularfire2 --save

没有帮助

npm install firebase-tools --save
firebase login
firebase init

也没有帮助

文件database.rules.json

{
  "rules": {
    ".read": "true",
    ".write": "true"
  }
}

console.firebase.google.com网站上的“规则”标签

service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if true;
    }
  }
}

请告诉我如何在Angular 6中正确安装Firebase

Answer 1

您已经为Cloud Firestore数据库设置了安全规则。但是您的代码正在尝试从Firebase实时数据库中读取。这两个数据库是完全分开的，并且使用不同的安全规则来控制访问。

要允许/courses对实时数据库中的节点进行读/写访问，请使用实时数据库的安全规则并使用：

{
  "rules": {
    "courses": {
      ".read": true,
      ".write": true
    }
  }
}