setSerialnumber example

$newSerials = 0;

        foreach ($serials as $serialnumber) {
            $serialnumber = trim($serialnumber);
            $serial = $this->get('models')->getRepository(EsdSerial::class)->findOneBy(['serialnumber' => $serialnumber]);
            if ($serial) {
                continue;
            }

            $serial = new EsdSerial();
            $serial->setSerialnumber($serialnumber);
            $serial->setEsd($esd);
            $this->getManager()->persist($serial);
            ++$newSerials;
        }
        $this->getManager()->flush();

        // Update stock         $freeSerialsCount = $this->getFreeSerialCount($esdId);
        $variant = $esd->getArticleDetail();
        $variant->setInStock($freeSerialsCount);