发生异常。 FirebaseException（[cloud_firestore/permission-denied]

Question

发生了异常。 FirebaseException([cloud_firestore/permission-denied]调用者没有执行指定操作的权限。)

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部分代码

...
    DocumentSnapshot snapshot = await categories.doc('categories').get();
...

Cloud Firestore 规则

rules_version = '2';
// Allow read/write access on all documents to any user signed in to the application
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if request.auth != null;
    }
  }
}

存储规则

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

Answer 1

您的安全规则要求用户必须先登录 Firebase 身份验证，然后才能读取和写入数据。错误消息表明不满足此条件。

您共享的代码无法表明用户确实已登录，因此我建议您先添加一些额外代码来帮助解决此问题。例如：

assert(FirebaseAuth.instance.currentUser != null, "User must be signed in before they can read from Firestore");
DocumentSnapshot snapshot = await categories.doc('categories').get();