Adds Elo rating to any ActiveRecord model via has_elo_ranking. It stores ratings in a separate EloRanking model to keep your host model clean, and provides domain-style methods for updating rankings after matches.

Elasticsearch integration for Databases, such as ActiveRecord

Merb plugin that provides ActiveRecord support

ActiveRecord validator to validate that email attribute contains valid email

Provides embeddable content functionality to apps using this gem.

Embeds your PORO models into ActiveRecord ones and stores them as JSON

EmbedsMany allows programmers to work with embedded records the same way as activerecord objects

Localization (L10n) and Internationalization (i18n) support for the Merb MVC Framework

The "resque" dispatch strategy for the emittance gem.

A framework for modelling the impact of real-world entities.

A software model in Ruby for the greenhouse gas emissions

UUID management for models

A library to automatically handle Emoji's without crashing your MySQL database

Extraction of the ActiveRecord::Base#import functionality from ar-extensions for Rails 3 and beyond

Extends ActiveRecord functionality by adding better finder/query support, as well as supporting mass data import, foreign key, CSV and temporary tables

ROXML is a Ruby library designed to make it easier for Ruby developers to work with XML. Using simple annotations, it enables Ruby classes to be mapped to XML. ROXML takes care of the marshalling and unmarshalling of mapped attributes so that developers can focus on building first-class Ruby classes. As a result, ROXML simplifies the development of RESTful applications, Web Services, and XML-RPC.

Lightweight gem that utilizes Rails server-side model validations to display client-side error messages for Ajax form submissions.

ActiveRecord backend for Employer

Active Record MTI gem powered by database views

Encore provides serializers and persisters to build JSON API-compliant Web services with Ruby on Rails.