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Strong Parameters
The strong_parameters gem is an improvement over attr_accessible to securely handle mass assignment even when you have complex authorization logic. The functionality will likely be added to Rails 4 so it is a good idea to learn how it works.
(12 minutes)
Authorization with CanCan
CanCan is a simple authorization plugin that offers a lot of flexibility. See how to use it in this episode.
(15 minutes)
Declarative Authorization
Declarative authorization provides an advanced and powerful solution for role based authorization.
(15 minutes)