public function addAccessory(ProductAddAccessoryEvent $event)
{
if (AccessoryQuery::create()->filterByAccessory($event->getAccessoryId())->filterByProductId($event->getProduct()->getId())->count() <= 0) {
$accessory = new Accessory();
$accessory->setDispatcher($event->getDispatcher())->setProductId($event->getProduct()->getId())->setAccessory($event->getAccessoryId())->save();
}
}