proxy

gistfile1.rb

class Image

  def after_save
    puts "after save image!"
  end

end

img = Image.new
img.after_save # => "after save image!"



# а теперь прокся :D

Image.class_eval do
  
  def after_save_proxy
    old_after_save
    puts "this is proxy call! :)"
  end
  
  alias :old_after_save :after_save
  alias :after_save :after_save_proxy

end

img_with_proxy = Image.new
img_with_proxy.after_save # => "after save image!" 
                          # => "this is proxy call! :)"