Stock.php

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<?php
namespace Magento\ProductAlert\Model\ResourceModel;

class Stock extends \Magento\ProductAlert\Model\ResourceModel\AbstractResource
{
    protected $_dateFactory;

    public function __construct(
        \Magento\Framework\Model\ResourceModel\Db\Context $context,
        \Magento\Framework\Stdlib\DateTime\DateTimeFactory $dateFactory,
        $connectionName = null
    ) {
        $this->_dateFactory = $dateFactory;
        parent::__construct($context, $connectionName);
    }

    protected function _construct()
    {
        $this->_init('product_alert_stock', 'alert_stock_id');
    }

    protected function _beforeSave(\Magento\Framework\Model\AbstractModel $object)
    {
        if ($object->getId() === null
            && $object->getCustomerId()
            && $object->getProductId()
            && $object->getWebsiteId()
        ) {
            if ($row = $this->_getAlertRow($object)) {
                $object->addData($row);
                $object->setStatus(0);
            }
        }
        if ($object->getAddDate() === null) {
            $object->setAddDate($this->_dateFactory->create()->gmtDate());
            $object->setStatus(0);
        }
        return parent::_beforeSave($object);
    }
}