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Caching in Rails 2.1
Rails 2.1 brings some new caching features which makes it very easy to cache any values including models. See how in this episode.
(8 minutes)
Tracking Attribute Changes
Rails 2.1 keeps track of the changes you make to a model's attributes. It also allows you to see what the previous value was. But watch out for the gotcha! See this episode for details.
(7 minutes)
named_scope
The named_scope method in Rails 2.1 makes performing finds on models very elegant and convenient. See how in this episode.
(11 minutes)