Libraries
Authentication
Devise - Flexible and modular authentication solution.
OmniAuth - Flexible authentication solution for multi-provider auth (e.g. Sign in with GitHub or Google).
Authorization
Pundit - Minimal authorization through OO design and pure Ruby classes.
ActiveJob
job-iteration - Make background jobs interruptible and resumable by design.
Countries
countries - All sorts of useful information about every country packaged as convenient little country objects. It includes data from ISO 3166 (countries and states/subdivisions ), ISO 4217 (currency), and E.164 (phone numbers).
Payments
ActiveMerchant - Payment abstraction library extracted from Shopify.
Phones
phony_rails - This Gem adds useful methods to your Rails app to validate, display and save phone numbers. It uses the super awesome Phony gem (floere/phony).
Event-Driven Architecture
rails_event_store - A Ruby implementation of an Event Store based on Active Record.
sequent - CQRS & event sourcing framework for Ruby.
Eventide - Microservices, Autonomous Services, Service-Oriented Architecture, and Event Sourcing Toolkit for Ruby with Support for Event Store and Postgres.
Enums
Enumerize - Enumerated attributes with I18n and ActiveRecord/Mongoid/MongoMapper/Sequel support.
Database
paranoia - Overriding ActiveRecord
deleteanddestroyto act as soft deletion.scenic - Versioned database views for Rails.
Auditing
audited - An ORM extension that logs all changes to your Rails models.
paper_trail - Track changes to your models, for auditing or versioning. See how a model looked at any stage in its lifecycle, revert it to any version, or restore it after it has been destroyed.
Localization
globalize - Rails I18n de-facto standard library for ActiveRecord model/data translation.
Forms
simple_form - Forms made easy for Rails! It's tied to a simple DSL, with no opinion on markup.
Views
view_component - A framework for building reusable, testable & encapsulated view components in Ruby on Rails.
PDF
wicked_pdf - PDF generator (from HTML) plugin for Ruby on Rails.
Monitoring
Bullet - Helps to kill N+1 queries and unused eager loading.
Testing
shoulda-matchers - Simple one-liner tests for common Rails functionality.
letter_opener - Preview mail in the browser instead of sending.
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