问FireStore:权限-在get匹配中被拒绝

EN

service cloud.firestore {
  match /databases/{database}/documents {
    match /usuarios/{uid} {
      // Give write access to any field within the document who's id is the uid
      // Add other validation as needed.
      allow write: if uid == request.auth.uid
          // Give admin access to anyone who's `level == 0`
          // Make sure to add the `databases...` boilerplate
          || get(/databases/$(database)/documents/usuarios/$(request.auth.uid)).data.level == 0;

      // If necessary, give access to sub-collections.
      // (We can't do it for uid or it will become a path object that we can't use as a string.)
      /{sub=**} {
        allow write: if uid == request.auth.uid;
      }
    }
  }
}