Calculates the delta between two collections of objects.

Additional real/virtual attribute change tracking independent of ActiveRecords

DeltaForce lets you use Postgres 8.4+ window functions with ActiveRecord

Facilitate simplistic guarding of denormalized followers on update of source of truth.

Denormalize ActiveRecord fields for performance reasons

This gem adds a `denormalize` option to ActiveRecord relation definitions, e.g. `has_many :foos, denormalize: { fields: :updated_at }`.

Chat Panel for Denshobato messaging.

Tool for better visualizing and managing dependencies

Automatically decides between :destroy and :delete / :delete_all for your Rails associations.

This gem is not needed in Rails 3 as dependent => :raise is included in 3.0.

This gem is not needed in Rails 3 as dependent => :raise is included in 3.0.

DeprecatedAttributes provides a straightforward and unobtrusive method for flagging deprecated attributes in your model. When these attributes are accessed, a warning message will be logged along with a trace of where the deprecated attribute was called. Additionally, an exception can be raised if desired.

Turn a module of behavioral concerns into a DSL for describing a large set of subtypes

Background tasks & Exporting and importing data out of Amazon AWS RedShift

Spam detection plugin for Rails 2 & ActiveRecord 2. Uses all the standard Rails conventions and my Despamilator gem. Use the main (non rails2) version for Rails 3.

Roles persisted in the database. Role is as a composition of grants. Roles may be assigned to user.

Destroy associations if specified attribute is blank

destroy database records in the background

Deletes records(without instantiating the records first) based on a block(which returns an array of ids) given and also recursively deletes all their associated records if they are marked as :dependent => :destroy. It is useful for background processing.

Delayed destroy ActiveRecord model