Re:Ask HN: Where is the Django community?
by wycats on Monday July 18, 2011 @10:21PM
(#2779326)
José Valim has written a book[1] that shows how to swap in all manner of functionality into Rails 3. It covers alternate renderers (PDF), alternate models, alternate template stores (SQL), custom template engines, using the built-in notification system, and alternate backends for I18n.
I highly recommend it.
[1] http://pragprog.com/book/jvrails/crafting-rails-applications