The second type of model inheritance supported from rails 6.1, delegated type, where each sub-model has its own database table and can be queried and created individually.

Default scopes are bad. Don't delete your data.

A gem which adds soft delete functionality

Delete/destroy associated ActiveRecord records in the background with ease.

ActiveRecord serializer DSL for mapping model attributes and associations. Similar to ActiveModel Serializers with many enhancements including bi-directional support, i.e. deserialization.

deploy management tool

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