Help with ACO Query

[Dave]

I am trying to check the Acos table for words in the alias field to prevent
a user from creating a slug called "users' or "profiles" or any other method
/ action / function in the site when they sign up and select a unique URL
 
This is in my User model and called from the validation ruleset
 
'slug-notRestricted' => array(
    'rule' => array('checkRestricted', 'slug'),
    'message' => 'The unique URL you selected is restricted.',
    'last' => true)),
 
function checkRestricted($data)
  {
  
      $valid = false;
  $q = $this->query("SELECT Aco.alias From acos AS Aco WHERE Aco.alias LIKE
'%" . $data . "%' OR Aco.alias = '$data'");
  
  if(empty($q)){
   
   $valid = true;
  }
  
  
  return $valid;
  
  
  }
 
But nothing happens.
 
Any ideas where i went wrong? I am using jquery to validate remote so in
firebug I see under the POST TAB:
 
data[User][slug]        admin
        
fieldname       slug

Thanks 

Dave

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