FireBase rule newData with uid
Suleiman
How can i to use unique id of new data in rule with newData?
Data structure: 
I want to disallow to write for the users which one senderName is in ban_users, but i cannot to get the newData senderName:
newData('senderName').val(); //not working
newData('$message_id/senderName').val(); //also not working("$message_id": {})
Rob DiMarco
To disallow writes to messages/main/$id, try the following write rule:
!root.child('chat/ban_users').hasChild(newData.child('senderName').val())
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