gistfile1.rb

module MyModule
  def clean_options
    # Just an example helper method
    # Don't want this to pollute the AR::Base namespace        
  end

  def do_other_stuff
    # Another helper method
  end

  module ActiveRecordExtensions
    extend ActiveSupport::Concern

    module ClassMethods
      def has_awesome_properties(options)
        # class A < AR::Base
        #   has_awesome_properties :some => options
        # end

        options = clean_options(options)

        do_other_stuff
      end
    end
  end
end

class ActiveRecord::Base
  include MyModule::ActiveRecordExtensions
end