How to cache pages and clear them in Refinery CMS

gistfile1.rb

# put in config/application.rb

config.to_prepare do
  ::PagesController.module_eval do
    caches_page :show, :unless => proc {|c| c.user_signed_in? || c.flash.any? }
    caches_page :home, :unless => proc {|c| c.user_signed_in? || c.flash.any? }
  end
  ::Page.module_eval do
    after_save :clear_static_caching!
    after_destroy :clear_static_caching!

    def clear_static_caching!
      Page.all.map(&:url).map{|u|
        [(u if u.is_a?(String)), (u[:path] if u.respond_to?(:keys))].compact
      }.flatten.map{ |u| [(u.split('/').last || 'index'), 'html'].join('.')}.each do |page|
        if (static_file = Rails.root.join('public', page)).file?
          $stdout.puts "Clearing cached page #{static_file.split.last}"
          static_file.delete
        end
      end
    end
    protected :clear_static_caching!
  end
end