acts_as_versioned is good. This allows an attribute level rollback instead

Log changes to your models

AuditLogger registra eventos de create, update e destroy em tabela propria, com payload bruto, payload humanizado e configuracao flexivel por initializer.

With gem audit_model you can log all changes to your models.

Auditor allows you to declaratively specify what CRUD operations should be audited and save the audit data to the database.

Track changes on Active Record models based on ActiveSupport::Callbacks and ActiveModel::Dirty

Auditron tracks who changed what on any ActiveRecord model — storing only the fields that changed, not full snapshots. Ships with a chainable query DSL, built-in log retention, a simple actor lambda, and works with PostgreSQL, MySQL, and SQLite. Zero hard dependencies beyond ActiveRecord.

Adds audit tables and triggers for postgres databases

Uses created_by_user_id and updated_by_user_id to store the changes made to a record. This is limited to storing the user who created the record and the last user to update the record.

An unobtrusive ruby authentication library based on ActiveRecord.

Rails authentication done right

Personal additions for Oauth and OpenID made dead simple

Oauth and OpenID made dead simple

Foo

Rule-based programmable permission system.

Libraries that use Ex Libris products, can integrate Rails application with PDS to provide single sign-on across systems.

AuthStrategies is a Warden implementation for sinatra.

Model-side logic for autocompleting belongs_to associations

Simple versioning with active record models

A simple daemon that checks and downloads assets from Jenkins