Relation.php

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

use Magento\Framework\Model\ResourceModel\Db\VersionControl\RelationInterface;
use Magento\Sales\Api\OrderItemRepositoryInterface;
use Magento\Sales\Model\ResourceModel\Order\Handler\Address as AddressHandler;
use Magento\Sales\Model\ResourceModel\Order\Payment as OrderPaymentResource;
use Magento\Sales\Model\ResourceModel\Order\Status\History as OrderStatusHistoryResource;

class Relation implements RelationInterface
{
    protected $addressHandler;

    protected $orderItemRepository;

    protected $orderPaymentResource;

    protected $orderStatusHistoryResource;

    public function __construct(
        AddressHandler $addressHandler,
        OrderItemRepositoryInterface $orderItemRepository,
        OrderPaymentResource $orderPaymentResource,
        OrderStatusHistoryResource $orderStatusHistoryResource
    ) {
        $this->addressHandler = $addressHandler;
        $this->orderItemRepository = $orderItemRepository;
        $this->orderPaymentResource = $orderPaymentResource;
        $this->orderStatusHistoryResource = $orderStatusHistoryResource;
    }

    public function processRelation(\Magento\Framework\Model\AbstractModel $object)
    {
        if (null !== $object->getItems()) {
            foreach ($object->getItems() as $item) {
                $item->setOrderId($object->getId());
                $item->setOrder($object);
                $this->orderItemRepository->save($item);
            }
        }
        if (null !== $object->getPayment()) {
            $payment = $object->getPayment();
            $payment->setParentId($object->getId());
            $payment->setOrder($object);
            $this->orderPaymentResource->save($payment);
        }
        if (null !== $object->getStatusHistories()) {
            foreach ($object->getStatusHistories() as $statusHistory) {
                $statusHistory->setParentId($object->getId());
                $statusHistory->setOrder($object);
                $this->orderStatusHistoryResource->save($statusHistory);
            }
        }
        if (null !== $object->getRelatedObjects()) {
            foreach ($object->getRelatedObjects() as $relatedObject) {
                $relatedObject->setOrder($object);
                $relatedObject->save();
            }
        }
        $this->addressHandler->removeEmptyAddresses($object);
        $this->addressHandler->process($object);
    }
}