lolproxy

gistfile1.rb

class Renderer
  
  def render
    puts "RENDERED"
  end
  
end

# а теперь создадим прокси :))

Renderer.class_eval do

  def proxy
    puts "proxy called"
    old_render
  end
  
  alias :old_render :render
  alias :render :proxy

end

r = Renderer.new
r.render # => proxy called
         # => RENDERED