DHH describes a similar caching scheme here: http://37signals.com/svn/posts/3113-how-key-based-cache-expiration-works http://37signals.com/svn/posts/3113-how-k

DHH describes a similar caching scheme here: http://37signals.com/svn/posts/3113-how-key-based-cache-expiration-works http://37signals.com/svn/posts/3113-how-key-based-cache-expi...