Add schema comments in your migrations, see them in model annotations and db/schema.rb dump

Execute your ActiveRecord migrations with Percona's pt-online-schema-change. Formerly known as Percona Migrator.

Provides enhancements to ActiveRecord to handle spatial datatypes in PostgreSQL and MySQL.

Download, pull out of a ZIP/TAR/GZ/BZ2 archive, parse, correct, and import XLS, ODS, XML, CSV, HTML, etc. into your ActiveRecord models. Uses Upsert internally for speed.

Fast fuzzy string matching for rails

Migrate large tables without downtime by copying to a temporary table in chunks. The old table is not dropped. Instead, it is moved to timestamp_table_name for verification.

Enables your monitoring infrastructure to easily query the status of your app server's health. Provides routes under /up.

Enable enum type for the MySQL Adapter in ActiveRecord

A phishing kit collector for scavengers

Use production statistics for realistic SQL query analysis. Finds code that may take down production, including missing indexes, overly broad indexes, and queries that return too much data.

ActiveRecord sharding extension

Job queue system to run job with Docker

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.

Adds the ability to pull random records from ActiveRecord

It is the library to reconnect automatically when ActiveRecord is disconnected from MySQL.

Brainstem allows you to create rich API presenters that know how to filter, sort, and include associations.

Auto-create models, views, controllers, and routes with this slick Rails extension

Record Cache for Rails 3

Track what product being viewed, what being purchased. Who are consistant buyers etc.