add_associations

# File activemodel/lib/active_model/serializers/xml.rb, line 123
        def add_associations(association, records, opts)
          merged_options = opts.merge(options.slice(:builder, :indent))
          merged_options[:skip_instruct] = true

          [:skip_types, :dasherize, :camelize].each do |key|
            merged_options[key] = options[key] if merged_options[key].nil? && !options[key].nil?
          end

          if records.respond_to?(:to_ary)
            records = records.to_ary

            tag  = ActiveSupport::XmlMini.rename_key(association.to_s, options)
            type = options[:skip_types] ? { } : { type: "array" }
            association_name = association.to_s.singularize
            merged_options[:root] = association_name

            if records.empty?
              @builder.tag!(tag, type)
            else
              @builder.tag!(tag, type) do
                records.each do |record|
                  if options[:skip_types]
                    record_type = {}
                  else
                    record_class = (record.class.to_s.underscore == association_name) ? nil : record.class.name
                    record_type = { type: record_class }
                  end

                  record.to_xml merged_options.merge(record_type)
                end
              end
            end
          else
            merged_options[:root] = association.to_s

            unless records.class.to_s.underscore == association.to_s
              merged_options[:type] = records.class.name
            end

            records.to_xml merged_options
          end
        end