enlighten_observers.rb

# From: http://scie.nti.st/2007/2/1/let-activerecord-observers-see-controller-context
# By Garry Dolley
# MIT / X11 licensed

module EnlightenObservers
  def self.included(base)
    base.extend(ClassMethods)
  end

  module ClassMethods
    def observer(*observers)
      observers.each do |observer|
        observer_instance = observer.to_s.classify.constantize.instance
        class <<observer_instance
          include Enlightenment
        end

        around_filter(observer_instance)
      end
    end
  end

  module Enlightenment
    def self.included(base)
      base.class_eval do
        attr_accessor :controller
      end
    end

    def before(controller)
      self.controller = controller
    end

    def after(controller)
      self.controller = nil # Clean up for GC
    end
    
    private
    
      def method_missing(method, *args, &block)
        if controller.respond_to?(method)
          controller.send(method, *args)
        else
          super
        end
      end
    
  end
end