easy_cache_key.rb

  # The CACHE_PATH Proc constant can be used by controller action caching
  #  Example Usage:  caches_action :index,  :layout => false, :cache_path => CACHE_PATH
  # Override the CACHE_EXPIRATION constant within your controller to change the
  # expiration time.
  #CACHE_EXPIRATION = 5 #in minutes
  CACHE_PATH = Proc.new{ |controller|
    "#{Digest::MD5.hexdigest(controller.request.request_uri +
        controller.request.format +
        controller.session[:user_id].to_s) +
        ((Time.now - Date.today.to_time).to_i/60).to_f.divmod((CACHE_EXPIRATION || 5))[0].to_s}"
  }