Ojs\CoreBundle\Service\SampleObjectLoader::loadPublisherTheme PHP Method

    public function loadPublisherTheme()
    {
        $entity = new PublisherTheme();
        $entity->setPublisher($this->em->getRepository(Publisher::class)->find(1))->setTitle('Sample Publisher Theme')->setPublic(true)->setCss('.sample-css{}');
        $this->em->persist($entity);
        $this->em->flush();
        return $entity->getId();
    }