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).each do |u|
        path = Rails.root.join('public',"#{u.respond_to?(:keys) ? u[:path].join('/') : (u.split("/").last || 'index' ).to_s}.html")  
        $stdout.puts "Clearing cached page #{path}"
        path.delete if path.exist?
      end
    end               

    protected :clear_static_caching!
  end
end