Dating App - Firebase Realtime Database Schema - Chat

chatSchema.jsonc

"chats": {
    "$chat_id": {
        // only members can read the node
        ".read": "root.child('chats/' + $chat_id + '/members').hasChild(auth.uid)",
        
        // If members not added yet, then any authenticated user can write. If members added already, then only members can write
        ".write": "(!root.child('chats/' + $chat_id).hasChild('members') && auth != null )|| root.child('chats/' + $chat_id + '/members').hasChild(auth.uid)",
          
        // Creating a new chat room requires to have member node
        ".validate": "!data.exists() && newData.hasChildren(['members'])",
        
        "members": {
            ".validate": "!data.exists()",
            "$member_uid": {
                ".validate": "root.child('users/' + $member_uid).exists()"
            }          
        },
        "last_message": { ".validate": "newData.isString()" },
        "last_message_timestamp": { ".validate": "newData.val() <= now" }
    }
}