ORM won't kill any kittens

gistfile1.php

  public function indexAction(){

    $entityManager = $this->getDoctrine()->getManager();

    $articles = $entityManager->getRepository('ORMDemoBundle:Article')->findAll();

    return $this->render(
      'ORMDemoBundle:Article:index.html.twig',
      ['articles' => $articles]
    );
  }