how to make order_by  smarter
i want to accept a parameter, 

    def get_all_order_by(self, _order_by) -> list:
        table = self.get_table()
        res = table.select().order_by(table._order_by.desc())    --> this doesnot work
        item_list = [d.to_item() for d in res]
        return item_list   