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.join('/') || 'index') + '.html' }.each do |page| 
        static_file = Rails.root.join(ActionController::Base.page_cache_directory, page)
            
        if static_file.file?
          Rails.logger.warn "Clearing cached page #{static_file.split.last}"
          static_file.delete
        else
          Rails.logger.warn "Couldn't find cache file #{static_file}"
        end
      end
    end
    protected :clear_static_caching!
  end
end