/**
     * @Route("/createBook/", name="createBook")
     */
    public function createBookAction(Request $request)
    {
        $title = $request->request->get('title');
        $description = $request->request->get('description');
        $rating = $request->request->get('rating');
        $authorId = $request->request->get('author');

        $em = $this->getDoctrine()->getEntityManager();
        $authorRepo = $em->getRepository('CoderslabBundle:Author');

        $author = $authorRepo->find($authorId);

        $newBook = new Book();
        $newBook->setTitle($title);
        $newBook->setDescription($description);
        $newBook->setRating($rating);

        $newBook->setAuthor($author);

        $em->persist($author);
        $em->persist($newBook);
        $em->flush();


        return $this->redirect($this->generateUrl('showBook', ['id' => $newBook->getId()]));
    }