Is it possible to define a ‘before_save’ callback in a module?

In Ruby on Rails < 3 (without Rails features, only Ruby)

module MyModule
  def self.included(base)
    base.class_eval do
      before_save :do_something
    end
  end

  def do_something
    #do whatever
  end
end

In Ruby on Rails >= 3 (with Rails Concern feature)

module MyModule
  extend ActiveSupport::Concern

  included do
    before_save :do_something
  end

  def do_something
    #do whatever
  end
end