Make it easy to upsert on MySQL, PostgreSQL, and SQLite3. Transparently creates merge functions for MySQL and PostgreSQL; on SQLite3, uses INSERT OR IGNORE.

Add binary (not string) UUIDs to ActiveRecord in MySQL

Integrated user activity notifications for Ruby on Rails. Provides functions to configure multiple notification targets and make activity notifications with notifiable models, like adding comments, responding etc.

Transparent ActiveRecord encryption

A collection of libraries for working with SQL on top of ActiveRecord's connection.

ThumbsUp provides dead-simple voting capabilities to ActiveRecord models with karma calculation, a la stackoverflow.com.

Your Rails console, 1984 style

Add a blog to your Rails application in minutes with this mountable Rails Engine

Tools to build your double entry financial ledger

LINES lets you manage your posts in a clear, consistent frontend. The gracefully slender editor keeps your editing simple and lets you just splash around in your ideas. Once you're happy, just hit publish and see your text, code examples, images, and links shine.

Mongify allows you to map your sql data into a mongodb document database with a simple DSL.

Create temporary table-backed ActiveRecord models for use in tests

Port of the Rails plugin "geokit-rails" to Rails 3, as a gem

ActiveRecord provides validations on app level but it won't guarantee the consistent. In some cases, like `validates_uniqueness_of` it executes additional SQL query to the database and that is not very efficient. The main goal of the gem is to provide compatibility between database constraints a...

Kuroko2 is a web-based job scheduler/workflow manager created at Cookpad Inc.

Obtain ActiveRecord results with a custom ordering with no need to store anything in the database.

Easily run queries on shard and replica databases.

ActsAsBookable is a reservation engine for Rails applications that allows resources to be booked. You can define availability rules for bookable models and set costraints to implement different types of booking (hotels, theaters, meeting rooms...)

Extract, Transform, and Load (ETL) ruby wrapper

A fast, safe, simple direct SQL executor for PG