db_cache_store is an alternative rails cache engine, that will use database server

Big-Data clustering algorithms in Ruby (on Rails). Currently only supports DBSCAN algorithm and ActiveRecord database.

A Database Code Pipeline for ActiveRecord

Distributed cron powered by your database

A package for importing DB Designer 4 xml models in rails.

DBDiagram

This plugin adds a dbdump command which dumps your Rails database out. This master branch supports Rails 3.0 and above, as a gem command. For Rails 2.3, use the rails_2_3 branch from github and install as a plugin. Like rails dbconsole, it takes your database connection details from config/database.yml, and supports mysql, mysql2, postgresql, and sqlite. It takes the same options as rails dbconsole, ie. -p to supply the password to your dump program for mysql and postgresql. (Note that for mysql, this means that the password is visible when other users on the system run 'ps'. Postgresql does not have this problem as it uses an environment variable set in ENV before execing and so not visible in ps.)

Dump database schema and chosen data from remote machine

By default Dbee ships with no underlying SQL generator. This library will plug in ActiveRecord into Dbee and Dbee will use it for SQL generation.

Tracking database commits for ActiveRecord

This library adds database-centric jobs to the Burner library. Burner does not ship with database jobs out of the box.

i18n in Database

Allow to prepend prefix tags to the beginning of the query logs to track name, shard and role of the database

library to cache (memoize) method return values in database

A ruby gem for validating your data migrations

Mule is a database migration tool based on a stand-alone version of Rails Migrations. By default, Mule uses SQL scripts instead of Migrations DSL, so no Ruby coding is required. It supports multi-database environments, including support for existing databases.

Encourage good DB practices in ActiveRecord migrations.

Manage tool for ruby script which executed to DB only once.

Durable queues which commit with database transactions.

Add geometry features on Active Record models