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Non Active Record Model
This episode will show you how to make a model which isn't based on Active Record. You may want to do this if a resource isn't backed by the database.
(12 minutes)
More on Virtual Attributes
Use a virtual attribute to implement a simple tagging feature. In this episode I show you how to assign virtual attributes through a callback instead of a setter method.
(7 minutes)
Session Based Model
If you have a lot of logic associated with the data inside a session, you'll need some central location to put this logic. See how to create a session based model in this episode.
(13 minutes)