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Active Admin
Active Admin allows you to quickly build an admin interface with just a few commands. Not only does it look great, but it is very customizable as shown in this episode.
(12 minutes)
Declarative Authorization
Declarative authorization provides an advanced and powerful solution for role based authorization.
(15 minutes)
Dynamic Page Caching
Use JavaScript to allow dynamic content in a page cache. In this episode I show you how to insert the user-specific content into a page through JavaScript.
(11 minutes)