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Active Model
In Rails 3 the non-database functionality of Active Record is extracted out into Active Model. This allows you to cleanly add validations and other features to tableless models.
(6 minutes)
Validations in Rails 3
Rails 3 offers several new additions to validations. Here learn how to make a custom error_messages partial, reflect on validations, and clean up complex validations in a model.
(9 minutes)
Introducing Devise
Devise is a full-featured authentication solution which handles all of the controller logic and form views for you. Learn how to set it up in this episode.
(10 minutes)