Ways to prevent users from pushing multiple child data or adding more than one child to a specific child in the Firebase database

How can we limit users from pushing more than one piece of data to the Firebase database in terms of security rules?

I have attempted this approach without success.

   {
    "rules": {
    ".read": false,
    ".write": false,    
    "voters": {

  // Ensuring that only one child can be added at a time by a user
  // Each user is restricted to adding just one child
  ".read": true,
  ".write": "auth !== null",
  ".validate": "newData < 2",
    "$votersuid": {
    ".read": true,
    ".write": "auth.uid == $votersuid",
    }   
  },
 }

}

Answer №1

If you add a boolean value to your node, you can easily test it using this code:

".write": "root.child('node_name').child('can_write').val() === true

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