add_attributes_and_methods

# File activemodel/lib/active_model/serializers/xml.rb, line 114
        def add_attributes_and_methods
          (serializable_attributes + serializable_methods).each do |attribute|
            key = ActiveSupport::XmlMini.rename_key(attribute.name, options)
            ActiveSupport::XmlMini.to_tag(key, attribute.value,
              options.merge(attribute.decorations))
          end
        end