includes.rb

require 'bundler/setup'
require 'active_support/all'

module Feature
  extend ActiveSupport::Concern

  included do |base|
    puts "#{base} included Feature"
  end
end

class AbstractRecord
  include Feature
end

class MyRecord < AbstractRecord
  include Feature
end

# output:
# AbstractRecord included Feature

module Feature
  def self.included(base)
    puts "#{base} included Feature"
  end
end

class AbstractRecord
  include Feature
end

class MyRecord < AbstractRecord
  include Feature
end

# output:
# AbstractRecord included Feature
# MyRecord included Feature