public function action_details($id = NULL) {
        if (is_null($id)) {
            throw new \MissingParamException('Missing book ID');
        }
        $book = $this->books->get_details($id, 'array');
        $this->data['id'] = $id;
        $this->data['title'] = $book['title'];
        if (\Arr::in_array_recursive('authors', $book)) {
            $author = $book['authors'];
            foreach ($author as $a) {
                \Arr::insert($tmp_a, $a->name, 0);
            }
            $this->data['authors'] = implode(',', $tmp_a);
        }
        if (\Arr::in_array_recursive('tags', $book)) {
            $tags = $book['tags'];
            $tmp_t = array();
            foreach ($tags as $t) {
                \Arr::insert($tmp_t, $t->name, 0);
            }
            $this->data['tags'] = implode(',', $tmp_t);
        }
        if (\Arr::in_array_recursive('genres', $book)) {
            $tmp_g = array();
            $genre = $book['genres'];
            foreach ($genre as $g) {
                \Arr::insert($tmp_g, $g->name, 0);
            }
            $this->data['genres'] = implode(',', $tmp_g);
        }
        \Debug::dump($book);
        \Debug::dump($this->data);

        return View::forge('owmx5/books/details.twig', $this->data);
    }