payablebasketitem.php

См. документацию.

<?php
 
namespace Bitrix\Sale;
 
use Bitrix\Main;
 
Main\Localization\Loc::loadMessages(__FILE__);

class PayableBasketItem extends PayableItem
{
    public static function getRegistryEntity()
    {
        return Registry::ENTITY_PAYABLE_BASKET_ITEM;
    }
 
    public static function getEntityType() : string
    {
        return Registry::ENTITY_BASKET_ITEM;
    }
 
    public function getPrice(): float
    {
        $basketItem = $this->getEntityObject();
 
        if ($basketItem)
        {
            return $basketItem->getPrice();
        }
 
        return 0;
    }
 
    public static function create(PayableItemCollection $collection, Internals\CollectableEntity $entity)
    {
        if (!$entity instanceof BasketItem)
        {
            throw new Main\SystemException(
                Main\Localization\Loc::getMessage(
                    'SALE_PAYABLE_ITEM_INCOMPATIBLE_TYPE',
                    ['#CLASS#' => BasketItem::class]
                )
            );
        }
 
        return parent::create($collection, $entity);
    }
 
    public function getEntityObject()
    {
        if ($this->item === null)
        {
            $payment = $this->collection->getPayment();
 
            $this->item = $payment->getOrder()->getBasket()->getItemById(
                $this->getField('ENTITY_ID')
            );
        }
 
        return $this->item;
    }
 
    protected function onFieldModify($name, $oldValue, $value)
    {
        if ($name === 'QUANTITY')
        {
            $quantity = $this->getEntityObject()->getQuantity();
            if ($quantity < $value)
            {
                $result = new Result();
 
                return $result->addError(
                    new Main\Error(
                        Main\Localization\Loc::getMessage('SALE_PAYABLE_ITEM_QUANTITY_ERROR')
                    )
                );
            }
        }
 
        return parent::onFieldModify($name, $oldValue, $value);
    }

    public static function getEntityEventName()
    {
        return 'SalePayableBasketItemEntity';
    }
}