/** 
  * Private method that handles assinging
  * karma to a user
  * @param string $karma_name
  * @param int $user_id
  * @return bool
  */
 public function addKarma($karma_name, $user_id)
 {
     // First find the karma record
     $karma = Karma::findOne(['name' => $karma_name]);
     if ($karma) {
         KarmaUser::attachKarma($user_id, $karma->id);
         return true;
     } else {
         return false;
     }
 }