code: public function handle(PreDeleteModelEvent $event)
      {
          if (!$this->wantToHandle($event)) {
              return;
          }
  
          if ($attribute = $this->createAttributeInstance($event->getModel())) {
              $this->deleteConditionSettings($event);
              $attribute->destroyAUX();
          }
      }
docs: Handle the update of an attribute and all attached data.
  
  @param PreDeleteModelEvent $event The event.
  
  @return void