Keep a DRY history of your ActiveRecord models' changes
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So, you need a bunch of radio buttons on a form. But there's no particular reason for you to save each question in its own database field. And, even better, you have access to the Hstore data type in postgres. hstore_radio_buttons is the library you are looking for.
Date and time validation plugin for ActiveModel and Rails. Supports multiple ORMs and allows custom date/time formats.
A gem to add warnings to ActiveRecord validations.
Module providing methods to models backed by redis data store.