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by wycats 5456 days ago
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