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Active Model Serializers
The ActiveModel::Serializers gem can help you build JSON APIs through serializer objects. This provides a dedicated place to fully customize the JSON output.
(10 minutes)
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)
Active Record Reputation System
If you need to calculate an average user's rating or sum up a number of votes, consider using the activerecord-reputation-system gem. Here I will cover the basics and also briefly present a from-scratch solution.
(10 minutes)
Searchlogic
Searchlogic makes searching models easier than ever with its assortment of named scopes. In this episode I show you how to create simple and advanced searches.
(13 minutes)
Inherited Resources
Inherited Resource simplifies RESTful controllers by providing default actions which can be customized through inheritance.
(9 minutes)
scope_out
The scope_out plugin will generate several helpful find methods for you automatically! It's the best way to move the find conditions into your model. Watch this episode for details.
(6 minutes)