# make the RJS helper proxy `page` available in Draper's Decorator

draper_rjs.rb

# in your .js.rjs templates, you can call #decorate on the magic page object
# and then use RJS-powered methods from within your Decorator
#
#    page.decorate User.first do |user|
#      user.blink
#    end
#
#    class UserDecorator < ApplicationDecorator
#      def blink
#        page[ "user_#{model.id}" ].animate 'blink'
#      end
#    end

module Draper::RJS
  def self.included(base)
    base.class_eval do
      alias_method_chain :initialize, :rjs
      attr_accessor :page
    end
  end

  def initialize_with_rjs(input, options={})
    initialize_without_rjs(input, options)
    self.page = options.delete(:page)
  end

  def page?
    !!page
  end
end

Draper::Base.class_eval do
  include Draper::RJS
end

module VersatileRJS::Draper
  def decorate(resource, options={}, &block)
    resource.decorate options.merge(:page => self), &block
  end
end

VersatileRJS::Page.class_eval do
  include VersatileRJS::Draper
end