Sanitizable concern to sanitize attributes the way you like

Rails gem to allowing records to be saveable

SCD models have identities and multiple time-limited iterations (revisions) per identity

Creation of automatic selection suitable for drop downs from column fields in an ActiveRecord table

Emulates sequence in MySQL database. Useful when you want your newly created object to have unique id value.

Let subclasses of ActiveRecord::Base to be shardable.

This ActiveRecord extension provides the capability to define or map attributes in your ActiveRecord models that can be easily represented with the necessary Open Graph, Twitter Cards or any other custom meta tags.

#execute! executes column's content as shellscript

This "acts_as" extension is a clone of the well known acts_as_list, only it avoids triggering active record callbacks.

Originally a Rails 2 plugin, this Gem ports that functionality to newer Rails versions.

Makes your Active Record models behave like content on Snapchat.

Acts as Soft Delete by Field: Provides soft deletion for ActiveRecord models using a field to flag the datetime of deletion

ActiveRecord model w/ a start_date and an end_date == ActsAsSpan

Create virtual attributes.

acts_as_starable is a gem that allows a model to act as a starer of other models or one that can be starred.

Add the ability to give star ratings to various models.

Given a list of datetime _at attributes allow an activerecord object to query status, change status and hold multiple states, these states can be used to build state machines or other constructs.

Rails injectable Redis-backed activity stream system. This is an alpha release of code that I just wrote and put into production on 3/11/12. Send feedback and post bugs to the Github page, but use at your own risk!

Easy way to define AR attributes that should be stripped before save

create a url-friendly stub based on an activerecord column for your models