Listing 11.16. Metoda execute_show() akcji kontynent/show
public function execute_show()
{
    if (
        isset($_GET['slug']) &&
        str_ivslug($_GET['slug']) &&
        ($kontynent = Doctrine::getTable('Kontynent')->findOneBySlug($_GET['slug']))
    ) {
        $this->set('kontynent', $kontynent);

    } else {
        $this->execute_404();
    }
}
