private function loadPosts(ObjectManager $manager)
 {
     foreach (range(1, 10) as $i) {
         $post = new Article();
         $post->setTitle($this->getRandomPostTitle());
         $post->setShortContent($this->getRandomPostShortContent());
         $post->setContent($this->getRandomPostSummary());
         $post->setCreateDate();
         $manager->persist($post);
     }
     $manager->flush();
 }