ruby on rails - XML Class for the partial file used in a Nokogiri class XML -

using rails 3.0.7 , ruby 1.9.2.

i using nokogiri build custom xml. calling partial builder file in main view file. class being used in partial xml not nokogiri. can explain why xml class not nokogiri ?

index.xml.erb

<%= nokogiri::xml::builder.new(:encoding => 'utf-8') { |xml|   puts "xml class in main file #{xml.class}"   xml.users {     @users.each |user|       xml << render(:partial=>"users/user", :locals=>{:user=>user, :xml => xml})     end   } }.to_xml.html_safe %> 

_user.builder

puts "xml class in builder file #{xml.class}" xml.user {   xml.id user.id   xml.name user.name   xml.email user.email } 

in application.rb, using :

activesupport::xmlmini.backend = 'nokogiri' 

output :

xml class in main file nokogiri::xml::builder xml class in builder file builder::xmlmarkup 

iiuc activesupport::xmlmini.backend = 'nokogiri' parsing xml params nokogiri instead of rexml, not builder template generation.

you're creating nokogiri::xml::builder manually, relying on render generate partial, therefore output consistent.

use following (in config/initializers/nokogiri_builders.rb use nokogiri via render (plus can stop using .xml.erb files create own instance of nokogiri::xml::builder , use .builder too):

# config/initializers/nokogiri_builders.rb # using nokogiri::xml::builder in lieu of stock pure ruby builder rails builder templates  module nokogiri   module xml     class builder       # handle instruct! instead of emitting nonsense tag       def instruct!(tag, options = {})         case tag         when :xml           @version = options[:version]           @encoding = options[:encoding]         else           raise notimplementederror(tag.inspect)         end       end        # redefined, recover instruct! gave       def to_xml(*args)         if nokogiri.jruby?           options = args.first.is_a?(hash) ? args.shift : {}           unless options[:save_with]             options[:save_with] = node::saveoptions::as_builder           end           args.insert(0, options)         end          if @version || @encoding           # set options according given           args[0][:version] = @version if @version           args[0][:encoding] = @encoding if @encoding           # emit declaration           args[0].delete(:save_with)         end          @doc.to_xml(*args)       end     end   end end  module actionview   module template::handlers     class builder       # default format used builder.       class_attribute :default_format       self.default_format = :xml        def call(template)         require_engine         code = <<-code           builder = nokogiri::xml::builder.new |xml|             #{template.source}           end           # default not emit declaration (use instruct! instead)           save_options = nokogiri::xml::node::saveoptions::no_declaration           # default utf-8, it's rails default encoding           options = { encoding: 'utf-8', indent: 2, save_with: save_options }           self.output_buffer = builder.to_xml(options)         code          code       end        protected        def require_engine         @required ||= begin           require 'nokogiri'           true         end       end     end   end end 

watch out though, nokogiri builds full dom before generating output to_xml, whereas builder concatenates strings on fly. might or might not want, large data sets. in both cases though, full final string resident in memory.