A ruby gem to handle multiple user roles on a Rails app, it also has Devise support

Active Record model versioning

Disabling the rendering of the attribute name for errors by the error_messages_for helper. Simply place a caret as the first character in the message.

Instance-based deploys made easy

Rails: Get notified when an after_commit block blows up

Rails plugin with dyanmic I18n backend for good internationalization.

Throttling of ActiveRecord model creations.

Ruby client for ArtLebedevStudio.RemoteTypograf service

Ruby interface to the AMEE carbon calculator

A small library that defines how ActiveRecord models should be anonymised for deletion purposes.

Replacement for broken Class.new(ActiveRecord::Base)

Passive network mapping tool

Add secure, production-ready API key authentication to your Rails app in minutes. Handles key generation, hashing, expiration, revocation, per-key scopes; plus a drop-in dashboard for your users to self-issue and manage their own API keys.

Generate Go Struct from activerecord models

Handles ActiveRecord authors in the same way as timstamps.

Arboreal is yet another extension to ActiveRecord to support tree-shaped data structures. Internally, Arboreal maintains a computed "ancestry_string" column, which caches the path from the root of a tree to each node, allowing efficient retrieval of both ancestors and descendants. Arboreal surfaces relationships within the tree like "children", "ancestors", "descendants", and "siblings" as scopes, so that additional filtering/pagination can be performed.

Arca is a callback analyzer for ActiveRecord ideally suited for digging yourself out of callback hell

Enable PostgreSQL's CHECK constraints on ActiveRecord migrations

Archive your Rails models rather than delete them, with model and controller concerns.

ArchiveTree is a Ruby Gem that makes it easy for you to create beautiful chronological archive trees of your models. For instance, you can create a tree for your blog posts.