icegulch

# it's not critical for understanding
# but here is the associated server-side action
#


  def version
    @program = load_program!
    @version = @program.versions.find(params[:version_id])

    if stale?(:last_modified => @version.updated_at, :etag => @version.cache_key)

icegulch

#! /usr/bin/env ruby

# this is best practice for writing mixins.  the deferred evaluation is more
# powerful that the approach of ClassMethods/InstanceMethods as modules too
#

  module Mixin
  # put your class level code in here
  #
    ClassMethods = proc do