Why I can't validate users?

Question

I am developing chat plugin and there are two types users: Operators and visitors. However I can NOT succeed to add users.

Here is my security rules:

{
  "rules": {
    // By default, make all data private unless specified otherwise.
    ".read": "auth != null",
    ".write": "auth != null",

    // Only operators or user itself can update their data
    "users": {
      "$user_id": {
        ".read": "auth != null && ($user_id === auth.user_id || auth.operator === true)",
        ".write": "auth != null && ($user_id === auth.user_id || auth.operator === true)",
        ".validate": "($user_id === newData.child('user_id').val() && newData.hasChildren(['name', 'type', 'status']))"
      }
    }    
  }
}

I got those log messages while adding user into Firebase DB in chat console:

Authenticated successfully with payload: Object {user_id: 112, is_operator: true}
Auth expires at: Thu Aug 15 2013 20:12:22 GMT+0300 (GTB Daylight Time)
FIREBASE: Attempt to write {"type":"operator","name":"op","user_id":112} to /users/operators/112 with auth={"user_id":112,"is_operator":true}
FIREBASE:   /:.write: "auth != null"
FIREBASE:       => true
FIREBASE:   /users/operators:.validate: "($user_id === newData.child('user_id').val() && newData.hasChildren(['name', 'type', 'status']))"
FIREBASE:       => false
FIREBASE: Validation failed.
FIREBASE: Write was denied.
FIREBASE WARNING: set at /users/operators/112 failed: permission_denied
(!) ERROR: Error: PERMISSION_DENIED :: auth() function while creating user

How can I solve this issue?

SOLUTION

I was wrong with $user_id. It should be auth.user_id in ".validate" part:

".validate": "(auth.user_id === newData.child('user_id').val() && newData.hasChildren(['name', 'type', 'status']))"

Answer 1

$user_id is wrong. It should be auth.user_id in the ".validate" part:

".validate": "(auth.user_id === newData.child('user_id').val() && newData.hasChildren(['name', 'type', 'status']))"