cool.rb

class PageObject
  def click
    puts 'click'
  end
  
  def submit
     puts 'submit'
  end
  
  def wait_for_ajax
    puts "waiting for ajax..."
  end
end

module AjaxEverything
  %w(click submit).each {|m| 
    class_eval "def #{m}(*); wait_for_ajax; super; end"
  }
end




class CoolPage < PageObject
  include AjaxEverything
end


CoolPage.new.click
# => waiting for ajax...
# => click