Flutter firebase realtime db to use displayName in Rules

Question

I updateProfile with a display name. I then try to access this display name in the database security rules. But the displayName on the database is not updated.

This is using Firebase realtime DB with Flutter.

Code:

await referencedData.firebaseAuth.currentUser.updateProfile(
        displayName: 'gameName'       //that only the players know about
    );

In my rules I have:

".write": "!data.exists() ||

auth.displayName == data.child('gamename').val()",

//rules meaning no data exists, so owner can create a new game or

//game name already set in database, I know this gamename, and it is in display name, so I can write and delete

I have spent 3 days or more searching for documentation or examples. Any ideas on where to look?

Answer 1

All properties are available under auth.token, and the display name is available under auth.token.name.

So:

".write": "!data.exists() ||
            auth.token.name == data.child('gamename').val()",

Also see the Firebase reference documentation for auth.token.