gistfile1.txt

module CacheHelper
  def self.included(base)
    base.class_eval do |klass|
      klass.send :include, ActionController::UrlWriter      
    end
    
    class << base
      def default_url_options
        ActionMailer::Base.default_url_options
      end
    end
  end
  
  def expire_fragment(key)
    return unless ActionController::Base.perform_caching
    
    Rails.cache.delete ActiveSupport::Cache.expand_cache_key(key.is_a?(Hash) ? url_for(key).split("://").last : key, :views)
  end
  
  def expire_action(key)
    return unless ActionController::Base.perform_caching
    
    fragment = "views/" + key.split(%r{://}).last
    Rails.cache.delete fragment
  end
end