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Mongoid
Mongoid is a polished, high-level Ruby gem for accessing MongoDB. Here I cover installation, adding fields, validations, associations, and keys.
(11 minutes)
Dynamic attr_accessible
It is important to use attr_accessible for security with mass assignment, but what if you need it to be dynamic based on user permissions? See how in this episode.
(9 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)