This post is kicking off a series that I’m doing about moving your skills and migrating your code to Rails 3. I’ll be sharing some practical insights and covering some pretty in-depth topics as we go along (I’ve got some notes for entries about upgrading plugins, taking advantage of new features like the agnosticism, migrating applications, and so on), but before I go into a lot of specifics, I thought it might be useful to go over some of the high-level philosophical and architectural changes that have gone on in the Rails code between versions 2 and 3.
(Full Story: Upgrading from Rails 2 to Rails 3: Introduction)