Read from stand-by databases for ActiveRecord

Background search indexing using existing worker systems.

Wallaby's ActiveRecord ORM adapter

ActiveRecord/Rails Integration for the Workflow library. Workflow is a finite-state-machine-inspired API for modeling and interacting with what we tend to refer to as 'workflow'.

Simulate multi-table inheritance for activerecord models using a polymorphic association

N+1 count query killer for ActiveRecord

N+1 count query killer for ActiveRecord

Awesome patches backported for ActiveRecord MySQL adapters

MySQL index hint support for ActiveRecord

N+1 count query killer for ActiveRecord

Rescue from MySQL and Sqlite duplicate errors

Add relational OLAP-like functionality for ActiveRecord

Directed Acyclic Graph hierarchy for Rail's ActiveRecord, supporting Rails 4.x

Use Youtube-Like ID in ActiveRecord seamlessly.

Represent ActiveRecord Markdown, Textile, RDoc columns as Markdown, Textile, RDoc objects using various external libraries to convert to HTML.

Adds the missing outer_joins method to ActiveRecord

Extension for ActiveRecord that adds support for PostgreSQL array columns, mapping string values to integers.

Restrict the values assignable to ActiveRecord attributes or associations

Cucumber Factory allows you to create ActiveRecord models from your Cucumber features without writing step definitions for each model.

Delayed is a multi-threaded, SQL-driven ActiveJob backend used at Betterment to process millions of background jobs per day. It supports postgres, mysql, and sqlite, and is designed to be Reliable (with co-transactional job enqueues and guaranteed, at-least-once execution), Scalable (with an optimized pickup query and concurrent job execution), Resilient (with built-in retry mechanisms, exponential backoff, and failed job preservation), and Maintainable (with robust instrumentation, continuous monitoring, and priority-based alerting).