attribute

# File activemodel/lib/active_model/attribute_registration.rb, line 12
      def attribute(name, type = nil, default: (no_default = true), **options)
        name = resolve_attribute_name(name)
        type = resolve_type_name(type, **options) if type.is_a?(Symbol)
        type = hook_attribute_type(name, type) if type

        pending_attribute_modifications << PendingType.new(name, type) if type || no_default
        pending_attribute_modifications << PendingDefault.new(name, default) unless no_default

        reset_default_attributes
      end