public static function factory($class_name, $connection_name = null)
{
$class_name = self::$auto_prefix_models . $class_name;
$table_name = self::_get_table_name($class_name);
if ($connection_name == null) {
$connection_name = self::_get_static_property($class_name, '_connection_name', ORMWrapper::DEFAULT_CONNECTION);
}
$wrapper = ORMWrapper::for_table($table_name, $connection_name);
$wrapper->set_class_name($class_name);
$wrapper->use_id_column(self::_get_id_column_name($class_name));
return $wrapper;
}