Patch class for has_many options style in Rails3 and Rails4

assoc_opts.rb

module AssocOpts
  extend ActiveSupport::Concern

  module ClassMethods
    def assoc_opts(options)
      return [options] if Gem::Version.new(Rails.version) < Gem::Version.new('4.0.0')

      order_option = options.delete(:order)
      include_option = options.delete(:include)
      if order_option && include_option
        [Proc.new { order(order_option).includes(include_option) }, options]
      elsif order_option
        [Proc.new { order(order_option) }, options]
      elsif include_option
        [Proc.new { includes(include_option) }, options]
      else
        [options]
      end
    end
  end
end

has_many_after.rb

# Rails3 and Rails4
class Course < ActiveRecord::Base
  include AssocOpts

  has_many :students, *assoc_opts(order: :name, include: [:parents, :brothers], dependent: :destroy)
end