cache

WEB缓存深入介绍 :http://www.cnblogs.com/sunli/archive/2009/11/24/1609444.html

https://devcenter.heroku.com/articles/building-a-rails-3-application-with-memcache

https://github.com/memcachier/examples-rails3-heroku

You could accomplish what you need in the same manner. Just code a custom method and make it available to your models. Then call the method with after_create, after_update, after_destroy in the model. If you want to make it happen to all models, you could probably do this in an initializer:

#UNTESTED, but should be close
ActiveRecord::Base.descendants.each do|model|
  model.class_eval do
    after_create :your_cache_method
    #... other callbacks
  end
end

You could then code a module with your_cache_method in it and include it in ActiveRecord::Base, so it would be available to all models

 http://www.codebeerstartups.com/2013/01/quick-way-to-setup-memcached-in-ruby-on-rails-application/

***Scaling Rails – 第八章 Memcached***

http://wp.xdite.net/?p=1029

Dalli replaces memcache-client [Rails 4 Countdown to 2013]

http://blog.remarkablelabs.com/2012/12/dalli-replaces-memcache-client-rails-4-countdown-to-2013

After maintaining the memcache-client gem for over two years, Mike Perham wrote Dalli. Dalli is a high performance drop-in replacement for memcache-client, and has been the client of choice for the last two years.