active_record_uuid is a nice gem that add uuid supports to your activerecord models (MySQL). It allows you to store uuid in various formats: binary (16 bytes), base64 (24 bytes), hexdigest (32 bytes), or string (36 bytes), and query back with uuid string.

Extends activerecord validations with helpers

Register PostgreSQL 'VERSION' column type in rails

ActiveRecord adapter for Vertica databaes

SQL views with ActiveRecord

Simple DSL to control callback attribute changed in ActiveRecord model

A simple mixin to ActiveRecord::Base that allows use of OR arel relations.

A method that allows you to run code without callbacks for a specific active-record model.

Adds methods to ActiveRecord::Relation for iterating with progress bars

Monkey-patches ActiveRecord to wrap all methods which use a database connection with #with_connection

A library for doing pooled writes to a SQL Datbase

An easy to use, YAML-based record storage solution, with ActiveRecord-like features

Small childly ORM for Redis

Redis activerecord like interface.

ActiveRedis is a Ruby ORM for Redis, using ActiveModel, heavily influenced by the ActiveRecord and Mongoid gems

Redis based analytics.

Data structure for quick item lookup via indexes.

Manage the states of records by commonly used attributes.

A Rails gem that reloads browser as soon as you do some changes in your Rails app. We as web developers are sometimes bounded in Change -> Switch to Browser -> Refresh -> Change cycle. This really hurts productivity. This gem will help you in breaking this cumbersome routine and your browser will be refreshed automatically whenever it detects any change in Rails code thus freeing you from that manually updating browser and hence resulting in increased productivity.

Bulk methods for ActiveRemote