include module with parameter, a prettier version imo

listable.rb

# adds `acts_as_list` and a `ordered` scope with given scope
# usage:
#   include Listable
#   include Listable[scope: :user]
module Listable
  extend ActiveSupport::Concern

  included do
    include ListableModule.new
  end

  class << self
    def [](acts_as_list_params)
      ListableModule.new(acts_as_list_params)
    end
  end

  class ListableModule < Module
    def initialize(acts_as_list_params = nil)
      @acts_as_list_params = acts_as_list_params
    end

    def included(base)
      acts_as_list_params = @acts_as_list_params

      base.class_eval do
        scope :ordered, -> { order(position: :asc) }

        acts_as_list acts_as_list_params
      end
    end
  end
end