public function register(Container $container)
 {
     $container['cms.get_post_url_attributes'] = $container->protect(function (Post $post) {
         return ['date' => $post->getCreated()->format('Y/m/d'), 'slug' => $post->getSlug()];
     });
     $container['cms'] = function () use($container) {
         $cms = new CMS($container['em']);
         $postCmsEntity = new CMSEntity(Post::class, PostType::class);
         $postCmsEntity->addColumn('title', function (Post $post) use($container) {
             $href = $container->path('post', $container['cms.get_post_url_attributes']($post));
             return '<a href="' . $href . '">' . $post->getTitle() . '</a>';
         });
         $postCmsEntity->addColumn('slug', 'slug');
         $cms->addCMSEntity($postCmsEntity);
         $pageCmsEntity = new CMSEntity(Page::class, PageType::class);
         $pageCmsEntity->addColumn('title', 'title');
         $pageCmsEntity->addColumn('slug', 'slug');
         $cms->addCMSEntity($pageCmsEntity);
         $menuCMSEntity = new CMSEntity(Menu::class, MenuType::class);
         $menuCMSEntity->addColumn('name', 'name');
         $cms->addCMSEntity($menuCMSEntity);
         $categoryCmsEntity = new CMSEntity(Category::class, CategoryType::class);
         $categoryCmsEntity->addColumn('Name', 'name');
         $cms->addCMSEntity($categoryCmsEntity);
         return $cms;
     };
 }