Mine

/**
 * Add custom classes to body
 */
// add category nicenames in body and post class
function dbdb_body_classes($classes) {
	global $wp_query;
	
	if( is_single() ) {
		$classes[] = 'blog';
	};
	
	// add a class = to the name of post or page
	$classes[] = $wp_query->queried_object->post_name;
	return array_unique($classes);
};
add_filter('body_class','dbdb_body_classes');