OrderedByCounter article

ordered_by_counter.rb

module MyModule
  extend ActiveSupport::Concern
  
  # removed code that modified User when
  # including this module in Article
end

module OrderedByCounter
  extend ActiveSupport::Concern
  
  included do
    class_attribute :counter_cache_column
    scope :order_by_counter, lambda { order("#{self.counter_cache_column} DESC") }
  end

  module ClassMethods
    
    def counter_order_from(association_name)
      klass = association_name.to_s.camelize.constantize # Article
      self.counter_cache_column = klass.get_counter_cache
    end

  end

end

class User < ActiveRecord::Base
  include OrderedByCounter

  counter_order_from :article
end

# => User.order_by_counter

# By including this module in User and declaring from where the
# counter relationship comes, I've avoided creating side effects
# and can more easily reason the origins of these methods