Connect rails app to multiple databases with ease, includes sqlite, mysql, oracle etc

Allow rails objects to agree to versioned contracts

State Machine integrated with ActiveRecord

Use Case: RBAC (Role-Based Access Control), security for API Server and any scenario that need fine-grained or flexible access control

Use Ruby hashes to group database table rows through ActiveRecord.

Generate ActiveRecord models automatically with basic relationships based on conventions.

Adds before_validation callback, which applies necessary function to attributes. There are some derivatives: squish_before_validation_for, downcase_before_validation_for, upcase_before_validation_for.

Convertr works with database and handles converting tasks. It fetches files from remote sources and converts them to appropriate formats with ffmpeg

Automatically sends notifications via AMQP when a model has been changed.

A simple gem to use in your controller to remove some of the work of comparing passwords and password confirmations.

Copyable makes it easy to copy ActiveRecord models.

Correole is a webservice that subscribes and unsubscribes readers from a newsletter.

Use this gem to define what is not nullable related to an ActiveRecord backed class

This makes it easier.

CounterOne provides improved counter cache for Rails app with support various relationships and conditions.

Gem for implementing multi country sites, enables countrizable extension for ActiveRecord model/data.

Helper method to simplify Rails caching, based on PackRat

The goal of this gem is to provide token-based authentication for Rails (or Rails-like) web applications.

CPF validation for ActiveModel and Rails

CrAuditable is gem used to save history for same table