public function getEndValue(Entity $entity, $field)
 {
     switch ($field) {
         case 'createDate':
             return date('Y-m-d', $entity->getCreateDate());
             break;
         case 'discount':
             return $entity->getDiscount() . ' %';
             break;
         case 'tax':
             return $entity->getTax() . ' %';
             break;
     }
     return parent::getEndValue($entity, $field);
 }