ar_module.rb

module Foo
  def included(base)
    base.extend ClassMethods
    # We need to call these AR methods ON the class
    base.class_eval do
      after_commit :foo
    end
  end
  
  module ClassMethods
    def find_by_foo(foo)
    end
  end
  
  # Instance Methods here, including the body of the after_commit
  def foo
    puts 'boo'
  end
end