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

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

Oauth and OpenID made dead simple, added custom token settings for Facebook

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).

A modern profiler for your Rails application

Instruments for Factory Bot

Preseed reusable data for factory girl

Adds query origin tracing to your logs.

Oauth and OpenID made dead simple

https://github.com/tsukasaoishi/fresh_connection

Another business actions architecture for Rails apps

Rails style structure for GraphQL API.

Jazz theory is a mathematical system of concepts and relationships, why not make an ActiveModel representation of those concepts?