Rails way to include functions used in several places

Question

I have a function (creation of a record in a table) that must be executed within before_save routines of models. What is the preferred way to do it? I am in Rails 3.1. A module in lib? A class in lib? application.rb?

Any example?

Thanks

Answer 1

Module in lib/. Why a class if it's just a function? And don't clutter application.rb.