Model History is a simple gem that allows you to keep track of changes to specific fields in your Rails models using the ActiveRecord::Dirty module.

Declarative partial mocking for ActiveRecord

The model renamer gem allows you to rename any a model in your rails application. The gem looks for occurrences of any variation or pluralization of the old model name and changes it to the corresponding variation of the new name. It also generates database migrations that rename tables and foreign keys referencing the old name.

Search model name from the table name.

A model files generator plugin from migrate file

ModelTokenizer creates random tokens to be used as primary keys for ActiveRecord objects

mod factor

`Mokei` is a builder library for Rails applications.

A honeypot style captcha extension for ActiveRecord. Simple one-line inclusion in the model combined with a simple form field should trap the bad guys in the molasses.

A flexible way to track user's interactions within your ruby web applications

A rails gem that allows you to briefly defer execution of tasks and return from requests faster.

A simple migrator/seeder

These are extensions from the money/currency classes.

Mongoid to ActiveRecord belongs to assocations with eager-loading

Provides a straightforward way for auditing changes on active record models, especially for composite entities. Also provides helper methods for easily rendering an audit trail in Ruby on Rails views.

Convert MongoDB query to Arel for MySQL. Forked from miyagawa/mongery

Rails specific I18n model localization meant to tie-in to existing ActiveRecord models, ala Globalize2, backed by MongoDB rather than an RDBMS. May include UI elements, too.

It is a gem for Fabio

Monocle helps you manage your DB views.

month_constrain is a re-implementation of acts_as_month_constrain for Rails 4, and 5.