module AxleAttributes
  module Validations
    extend ActiveSupport::Concern

    included do
      validate :validate_formats
    end

    private

      def validate_formats
        each_provided_definition do |definition|
          value = send(definition.name)
          if value.present? && error = definition.validate(value)
            errors.add(definition.name, error)
          end
        end
      end

      def each_provided_definition
        provided_set.each do |attr|
          if definition = self.class.attributes[attr]
            yield definition
          end
        end
      end

  end
end