public function film_management()
{
$this->config->load('grocery_crud');
$this->config->set_item('grocery_crud_dialog_forms',true);
$this->config->set_item('grocery_crud_dialog_color','blue');
$crud = new grocery_CRUD();
$crud->set_theme('materializecss'); // magic code
$crud->set_table('film');
$crud->set_relation_n_n('actors', 'film_actor', 'actor', 'film_id', 'actor_id', 'fullname','priority');
$crud->set_relation_n_n('category', 'film_category', 'category', 'film_id', 'category_id', 'name');
$crud->unset_columns('special_features','description','actors');
$crud->fields('title', 'description', 'actors' , 'category' ,'release_year', 'rental_duration', 'rental_rate', 'length', 'replacement_cost', 'rating', 'special_features');
$output = $crud->render();
$this->_example_output($output);
}