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Asked: 2026-06-11T13:31:01+00:00

I am using Ruby on Rails 3.2.2 and I would like to extract some

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I am using Ruby on Rails 3.2.2 and I would like to “extract” some methods from my models / classes. That is, in more than one class / model I have some methods (note: methods are related to user authorizations and are named the “CRUD way”) that are and work practically the same; so I thought that a DRY approach is to put those methods in a “shared” module or something like that.

What is a common and right way to accomplish that? For example, where (in which directories and files) should I put the “shared” code? how can I include mentioned methods in my classes / models? what do you advice about?

Note: I am looking for a “Ruby on Rails Way to make things”.

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1 Answer

  1. Editorial Team

    One popular approach is to use ActiveSupport concerns. You would then place the common logic typically under app/concerns/ or app/models/concerns/ directory (based on your preference). An illustrative example:

    # app/concerns/mooable.rb
module Mooable
  extend ActiveSupport::Concern

  included do
    before_create :say_moo

    self.mooables
      where(can_moo: true)
    end
  end

  private

  def say_moo
    puts "Moo!"
  end
end

    And in the model:

    # app/models/cow.rb
class Cow < ActiveRecord::Base
  include Mooable
end

    In order to make it work this way you have to add the following line to config/application.rb

    config.autoload_paths += %W(#{config.root}/app/concerns)

    More information:

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