public function showAction($slug)
    {
        $category = $this->getCategoryRepository()->retrieveActiveBySlug($slug);

        if (!$category) {
            throw $this->createNotFoundException('category doesnt exists');
        }

        return $this->render(
            'GenjFaqBundle:Category:show.html.twig',
            array(
                'category' => $category
            )
        );
    }