Store nested hashes and other types in ActiveRecord hstores

Write-through and Read-through Cacheing for ActiveRecord

Disables observers during testing, allowing you to write model tests that are completely decoupled from the observer.

Off The Rails ActiveRecord: Use ActiveRecord with Grape, Sinatra, Rack, or anything else! Formerly known as 'grape-activerecord'.

Extends Paperclip with Dropbox storage.

pg-eyeballs is a ruby gem that gives you detailed information about how the SQL queries created by the active record code you write are executed by the database. It gives you an easy, ruby friendly way to see the output of the Postgres EXPLAIN command and integrates with the popular query analysis tool gocmdpev

Organize ActiveRecord model into a tree structure using PostgreSQL LTree

pluto-models - planet schema 'n' models for easy (re)use

Easily write arbitrary filters

A lightweight cron scheduler for the Que async job worker

Declaratively filter data via URL params, in any Rack app.

The Let's Encrypt certificate manager for rails

Record Cache for Rails 3

Reportable allows for easy report generation from ActiveRecord models by the addition of the reportable method.

Rmre creates ActiveRecord models for legacy database with all constraints found.

Better support for legacy database schemas for ActiveRecord, such as columns named class, or any other name that conflicts with an instance method of ActiveRecord.

Provides an internal extension API to ActiveRecord, in the form of middleware-style callback stacks

A smart sms verification tool

ActiveRecord extension. Allows to save record without calling callbacks and validations.

Read from stand-by databases for ActiveRecord