Modified version of caches_page to allow specifiying an :expire_after such that the page will be expired via a background job

caches_page_with_expire_after.rb

class ActionController::Base
  # Modified version of caches_page to allow specifiying an :expire_after
  # such that the page will be expired via a background job
  # Example:
  # class PostsController < ApplicationController
  #   time_caches_page :index, :expire_after => 5.minutes
  #   .
  #   .
  # end
  def self.time_caches_page(*actions)
    return unless perform_caching
    options = actions.extract_options!
    
    expire_after = options.delete(:expire_after)
    raise ArgumentError, "no :expire_after provided" if expire_after.blank?
    
    after_filter({:only => actions}.merge(options)) do |c|
      c.cache_page
      # Relies on the presence of DelayedJob gem presence (http://rubygems.org/gems/delayed_job)
      actions.each {|a| send_at(Time.now.utc + expire_after, :expire_page, c.request.path)}
    end
  end
end