我目前正在建立一個聊天應用，但遇到了 Firebase 規則的問題。我想限制用戶看到他們不參與的對話。但是，當我嘗試實施這些規則時，即使檢查對話是否存在，存取似乎也會被拒絕。如何正確配置 Firebase 規則，以允許使用者僅查看他們所屬的對話，而不是資料庫中的所有對話？

這是規則集，我試著僅為對話實作。

rules_version = '2'; service cloud.firestore { match /databases/{database}/documents { // Allow users to read and write their own participant documents match /conversation/{conversationId}/participants/{userId} { allow read, write: if request.auth.uid == userId; } // Allow users to read and write messages in a conversation they are a participant of match /conversation/{conversationId}/messages/{messageId} { allow read, write: if exists(/databases/$(database)/documents/conversation/$(conversationId)/participants/$(request.auth.uid)); } // Allow users to read and write their own conversation documents match /conversation/{conversationId} { allow read, write: if exists(/databases/$(database)/documents/conversation/$(conversationId)/participants/$(request.auth.uid)); } } }

存取已經在「最頂層」被拒絕，這就是這部分：

// Allow users to read and write their own conversation documents match /conversation/{conversationId} { allow read, write: if exists(/databases/$(database)/documents/conversation/$(conversationId)/participants/$(request.auth.uid)); }

我認為，這與這些嵌套對話的工作方式有關，但我不知道我必須改變什麼。我嘗試在 google firebase 文件中閱讀有關此內容的內容，但找不到任何與此相關的內容。 如果您有任何想法，如何解決此問題，請告訴我。謝謝！

我已經嘗試讓它與多個“規則集”一起使用。它總是在exists()函數處失敗。

我也嘗試過這個，但似乎也不起作用：

rules_version = '2'; service cloud.firestore { match /databases/{database}/documents { function isUserInParticipants(conversationId) { return get(/databases/$(database)/documents/conversations/$(conversationId)/participants/$(request.auth.uid)).data != null; } match /conversations/{conversationId} { allow read, write: if request.auth != null && isUserInParticipants(conversationId); match /messages/{messageId} { allow read, write: if request.auth != null && isUserInParticipants(conversationId); } } } }

這是我在 Vue.js 中使用的查詢：

init() { const storeAuth = useStoreAuth(); conversationCollectionRef = collection(db, 'conversation') conversationCollectionQuery = query(conversationCollectionRef) this.getConversations() }, async getConversations() { this.coversationsLoaded = false getConversationSnapshot = onSnapshot(conversationCollectionQuery, (snapshot) => { console.log('getConversations') console.log(snapshot) this.conversations = [] snapshot.forEach((doc) => { this.getMessagesOfConversation(doc.id) const conversation = { id: doc.id, ...doc.data(), } this.conversations.push(conversation) }) }) this.coversationsLoaded = true },

firestore.collection("conversation").get()

firestore.collection("conversation").where().get()