Shipment.php

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

use Magento\Framework\App\ResourceConnection as AppResource;
use Magento\SalesSequence\Model\Manager;
use Magento\Sales\Model\ResourceModel\Attribute;
use Magento\Sales\Model\ResourceModel\EntityAbstract as SalesResource;
use Magento\Sales\Model\Spi\ShipmentResourceInterface;

class Shipment extends SalesResource implements ShipmentResourceInterface
{
    protected $_eventPrefix = 'sales_order_shipment_resource';

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

    protected function _construct()
    {
        $this->_init('sales_shipment', 'entity_id');
    }

    protected function _beforeSave(\Magento\Framework\Model\AbstractModel $object)
    {
        if ((!$object->getId() || null !== $object->getItems()) && !count($object->getAllItems())) {
            throw new \Magento\Framework\Exception\LocalizedException(__('We cannot create an empty shipment.'));
        }

        if (!$object->getOrderId() && $object->getOrder()) {
            $object->setOrderId($object->getOrder()->getId());
            $object->setShippingAddressId($object->getOrder()->getShippingAddress()->getId());
        }

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