Firebase数据库安全规则，使用Android仅访问用户生成的数据

我想创建聊天支持应用程序模型。我只有一个代理和许多请求查询的用户。每个用户都可以与代理进行多次对话（假设它就像一个whatsapp组，只有两个成员，一个用户和该代理）

因此，我创建了一个数据结构，如：

Conversation
-uId
-status
-conversationTitle

至于信息

Message
-conversationId
-message
-from //0 mean it from me to my friend and 1 for a message from my friend to me
-timestamp

基本结构如下：

Conversation1:{ "uId": "1", "status":0, "conversationTitle": "First conversation"},
Conversation2:{ "uId": "2", "status":0, "conversationTitle": "Second conversation"},
Conversation1:{ "uId": "1", "status":0, "conversationTitle": "Third conversation"}

至于信息：

    Message1: {"conversationId": "Conversation1", "message": "Hello there 1!", "from":0, "timestamp":******** },
    Message2: {"conversationId": "Conversation1", "message": "Hello there 2!", "from":0, "timestamp":******** },
    Message3: {"conversationId": "Conversation2", "message": "Hello there 3!", "from":0, "timestamp":******** },
    Message4: {"conversationId": "Conversation3", "message": "Hello there 4!", "from":0, "timestamp":******** },

如您所见，消息1和2属于会话1，而会话1又属于uID为1的用户1

我希望与用户1（uId:1）和用户2（uId:2）发生的所有对话都不能看到1的对话

我把安全写为：

"conversations":{
  "$uid":{
    ".read": "data.child('uId').val() == auth.uid",
    ".write":"auth != null && newData.child('uId').val() == auth.uid"
  }
}

然后在Android中：

FirebaseDatabase database = FirebaseDatabase.getInstance();
Query conversationsRef = database.getReference("conversations");

FirebaseRecyclerAdapter<Conversation, ConversationHolder> binderData = new FirebaseRecyclerAdapter<Conversation, ConversationHolder>(Conversation.class, R.layout.item_butler_converastions, ConversationHolder.class, conversationsRef) {
                    @Override
                    public void populateViewHolder(ConversationHolder chatMessageViewHolder, Conversation chatMessage, int position) {
                        chatMessageViewHolder.setName(chatMessage.getTitle());
                    }

                    @Override
                    protected void onCancelled(DatabaseError error) {
                        super.onCancelled(error);
                    }
                };

但是没有起作用。提前谢谢

Query conversationsRef = database.getReference("conversations").orderByChild("uId").equalTo(mAuth.getCurrentUser().getUid());