我得到了错误

gettingdocuments.com.google.firebase.firestore.FirebaseFirestoreException: PERMISSION_DENIED:缺少或权限不足。

对于下面关于else语句的代码

db.collection("users")
    .get()
    .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
        @Override
        public void onComplete(@NonNull Task<QuerySnapshot> task) {
             if (task.isSuccessful()) {
                 for (DocumentSnapshot document : task.getResult()) {
                     s(document.getId() + " => " + document.getData());
                 }
             } else {
                 s("Error getting documents."+ task.getException());
             }
         }
     });

当前回答

时间限制可能已过

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {

    // This rule allows anyone on the internet to view, edit, and delete
    // all data in your Firestore database. It is useful for getting
    // started, but it is configured to expire after 30 days because it
    // leaves your app open to attackers. At that time, all client
    // requests to your Firestore database will be denied.
    //
    // Make sure to write security rules for your app before that time, or else
    // your app will lose access to your Firestore database
    match /{document=**} {
      allow read, write: if request.time < timestamp.date(2020,7, 1);
    }
  }
}

这一行更改了日期:

 allow read, write: if request.time < timestamp.date(2020,7, 1);

其他回答

NPM I—save firebase @angular/fire

在app.module中确保你导入了

import { AngularFireModule } from '@angular/fire';
import { AngularFirestoreModule } from '@angular/fire/firestore';

进口

AngularFireModule.initializeApp(environment.firebase),
    AngularFirestoreModule,
    AngularFireAuthModule,

在实时数据库规则中,确保你有

{
  /* Visit  rules. */
  "rules": {
    ".read": true,
    ".write": true
  }
}

在云壁炉规则确保你有

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if true;
    }
  }
}

也许你该把日期去掉

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if
          request.time < timestamp.date(2021, 12, 12);
    }
  }
}

进入数据库->规则:

然后更改如下规则

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

以下

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

此外,如果您的代码中的集合引用与firebase上的集合名称不匹配,则可能会出现此错误。

例如,firebase上的集合名称是users,但您使用db.collection(" users ")或db.collection("user")引用它。

它也是区分大小写的。

希望这对大家有所帮助

https://console.firebase.google.com

开发->数据库->规则->设置读、写-> true