require 'subj_models/concerns/comprising_external_id'

module SubjModels

  module MeasureUnit

    def self.included(including_class)

      including_class.class_eval do

        include SubjModels::ComprisingExternalId

        belongs_to :attribute_value

        has_many :nomenclature_prices

        validates :name, presence: true

      end

    end

    def to_s
      name
    end

  end
end