Item.php

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<?php
namespace Magento\Sales\Model\ResourceModel\Order;

use Magento\Sales\Model\ResourceModel\EntityAbstract as SalesResource;
use Magento\Sales\Model\Spi\OrderItemResourceInterface;

class Item extends SalesResource implements OrderItemResourceInterface
{
    protected $_eventPrefix = 'sales_order_item_resource';

    protected $_serializableFields = ['product_options' => [[], []]];

    protected function _construct()
    {
        $this->_init('sales_order_item', 'item_id');
    }

    protected function _beforeSave(\Magento\Framework\Model\AbstractModel $object)
    {
        if (!$object->getOrderId() && $object->getOrder()) {
            $object->setOrderId($object->getOrder()->getId());
        }
        if ($object->getParentItem()) {
            $object->setParentItemId($object->getParentItem()->getId());
        }

        return parent::_beforeSave($object);
    }
}