public function updateBan($id, $ban)
 {
     if (!($model = $this->findById($id))) {
         throw new \Exception("Contractor not found", 1);
         return;
     }
     if (!($user = $model->user)) {
         throw new \Exception("User not found", 1);
         return;
     }
     if (!($throttle = \User::findThrottlerByUserId($user->id)) || !$user->hasAccess('contractor')) {
         throw new \Exception("User is not contractor", 1);
         return;
     }
     if ($ban === 'true') {
         $throttle->ban();
     } else {
         $throttle->unban();
         if ($throttle->isSuspended()) {
             $throttle->unsuspend();
         }
     }
     return true;
 }