function delete(){
		$users = $this->getCategoryUsers();
		if ($users){
			foreach ($users as $user){
				$user->setDefaultBillingId(0);
				$user->save();
			}
		}
		parent::delete();
	}
 function delete()
 {
     $workspace_billings = WorkspaceBillings::find(array('conditions' => 'billing_id = ' . $this->getId()));
     if ($workspace_billings) {
         foreach ($workspace_billings as $billing) {
             $billing->delete();
         }
     }
     $users = $this->getCategoryUsers();
     if ($users) {
         foreach ($users as $user) {
             $user->setDefaultBillingId(0);
             $user->save();
         }
     }
     parent::delete();
 }