public function load(ObjectManager $manager)
 {
     // create
     // a writer
     $writer = new Writer();
     $writer->setFullanme('Test Writer');
     $writer->setEmail("*****@*****.**");
     $writer->setPhone("00112233445566");
     $manager->persist($writer);
     self::$writers[] = $writer;
     // an article
     $article = new Article();
     $article->setTitle('This is a test title');
     $article->setLead('This is a test lead');
     $article->setContent('This is a test content');
     $article->setRate(1);
     $article->setWriter($writer);
     $manager->persist($article);
     self::$articles[] = $article;
     // a notifications
     $notify = new Notification();
     $notify->setNotify('This is a test notification');
     $notify->setArticles($article);
     $notify->setCreated(new \DateTime());
     $manager->persist($notify);
     self::$notifications[] = $notify;
     // an  another notifications
     $notify_2 = new Notification();
     $notify_2->setNotify('This is a test notification');
     $notify_2->setArticles($article);
     $notify_2->setCreated(new \DateTime("now"));
     self::$notifications[] = $notify_2;
     $manager->flush();
 }