module ActionController::Caching::Pages

def expire_page(options = {})

expire_page :controller => "lists", :action => "show"
Expires the page that was cached with the +options+ as a key. Example: 
def expire_page(options = {})
  return unless self.class.perform_caching
  if options.is_a?(Hash)
    if options[:action].is_a?(Array)
      options[:action].dup.each do |action|
        self.class.expire_page(url_for(options.merge(:only_path => true, :action => action)))
      end
    else
      self.class.expire_page(url_for(options.merge(:only_path => true)))
    end
  else
    self.class.expire_page(options)
  end
end