Rails 3 gem to treat an attribute as a decimal (getting and setting floating-point values) but storing it as an integer in the database (useful for prices and other precision-needed attributes like money).

Using acts as default you can set a default row in your activerecord collection, also for has_many relationships

This 'acts_as' extension provides the capability for having a default object. The class that has this specified needs to have a default column defined as an integer, string or boolean on the mapped database table

ActsAsDiffable provides a dead-simple way to compare two instances of a class, including any or all associations, or more complex relationships.

This gem sets the digested value before validation and validates uniqueness of the digested value.

Another paranoid gem

Easy way to define AR attributes that should be stored in lowercase

Editions for ActiveRecord models

A categorizing plugin for Rails Applications

Active Record extender to make a database column enumerable and queryable

ActiveRecord plugin to validate values of column in specified word

Acts as EstraierDoc

Seamlessly integrates Java's Executor framework with Ruby on Rails

With ActsAsExpirable, you can mark ActiveRecord records as expired and programmatically find expired record.

Adds GitHub-like search function to your models

ActiveRecord Helper for Extjs

Add favorite feature to any Active Record models

Designates an attribute on this model to indicate "featuredness," where only one record within a given scope may be featured at a time.

Filter attributes and stuff.

This "acts_as" extension provides the capabilities for beautiful record finding by specified column(s).