def check_maxProperties(max, instance)
      if instance.is_a?(Mongoff::Record) || instance.is_a?(Hash)
        instance = instance.orm_model.stored_properties_on(instance) if instance.is_a?(Mongoff::Record)
        raise_path_less_error "has too many properties (#{instance.size} of #{max} max)" if instance.size > max
      end