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Give your models as-of date temporal extensions. Built entirely for PostgreSQL >= 9.4

Provides automatic deadlock retry and logging functionality for ActiveRecord and MySQL

Fast batch deletes for Active Record and Postgres

Easy role authorization in rails

Preload factories (Factory Bot) just like fixtures. It will be easier and, probably, faster!

Ferry is a data migration and visualization command line tool rubygem that seeks to simplify the increasingly prevalent big data problems for developers

hydra_attribute is an implementation of EAV pattern for ActiveRecord models.

Rails I18n library for ActiveRecord model/data translation using PostgreSQL's JSONB datatype. Translations are stored directly in the model table rather than shadow tables.

Organizes ActiveRecord models into a tree/hierarchy using a materialized path implementation based around PostgreSQL's ltree datatype. ltree's operators ensure that queries are fast and easily understood.

A user-centric flagging extension for Rails 3 applications.

Ruby gem that automatically adds a lock timeout to all Active Record migrations

Loader to solve N+1 issue for good.

Extend Ruby on Rails ActiveRecord with Neo4j nodes. Keep RDBMS and utilize the power of Neo4j queries. Originally by @elado.

Store nested hashes and other types in ActiveRecord hstores

Write-through and Read-through Cacheing for ActiveRecord

Disables observers during testing, allowing you to write model tests that are completely decoupled from the observer.

Off The Rails ActiveRecord: Use ActiveRecord with Grape, Sinatra, Rack, or anything else! Formerly known as 'grape-activerecord'.

Extends Paperclip with Dropbox storage.

pg-eyeballs is a ruby gem that gives you detailed information about how the SQL queries created by the active record code you write are executed by the database. It gives you an easy, ruby friendly way to see the output of the Postgres EXPLAIN command and integrates with the popular query analysis tool gocmdpev