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Mountable Engines
Engines are receiving a major update in Rails 3.1. You can mount them at any path, embed assets, run generators and more. See how in this episode.
(13 minutes)
Template Inheritance
In Rails 3.1 the controller inheritance also applies to the view layer. Here I show how to add an application template which is shared by all views, and a lookup path for overriding templates based on the subdomain.
(8 minutes)