Augmentations gem

Augmentations is a tiny Ruby gem to easily extend any class with instance methods and class methods, as well as running class methods like belongs_to at extend time.

It's basically like includeing a module, but you can also define class methods and call class methods as you would in the class itself, without (ab)using the self.included hook and thus with less boilerplate.

Why do we need this now ActiveSupport has Concerns? Several reasons.

1: You're using plain Ruby or a non-Rails framework and you want the behaviour without the bulk of ActiveSupport.

2: You don't like the fact that ActiveSupport calls them 'Concerns' when they're just modules effectively implementing a form of multiple inheritance.

3: You don't like the module dependency management system built in to ActiveSupport Concerns. (Modules that depend on eachother are a code smell, cyclical dependencies doubly so.)

Use it like

class User < ActiveRecord::Base
  augment Shared::Pingable, User::PasswordResetExtension

with modules like

module User::PasswordResetExtension
  augmentation do

    has_many :password_resets

    def self.a_class_method
      # …

    def an_instance_method
      # …


(If you want to weird things up in the name of fewer lines of code, the Ruby parser will accept

module User::PasswordResetExtension augmentation do


end end



Add this line to your application's Gemfile:

gem 'augmentations'

And then execute:

$ bundle

Or install it yourself as:

$ gem install augmentations


Originally by Henrik Nyh for DanceJam under the MIT license.

Original repository


  1. Fork it ([my-github-username]/augmentations/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request