method

to_xml

v2.1.0 - Show latest stable - 0 notes - Class: ActiveSupport::CoreExtensions::Array::Conversions

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to_xml(options = {}) public

Returns a string that represents this array in XML by sending to_xml to each element. Active Record collections delegate their representation in XML to this method.

All elements are expected to respond to to_xml, if any of them does not an exception is raised.

The root node reflects the class name of the first element in plural if all elements belong to the same type and that’s not Hash:

  customer.projects.to_xml

  <?xml version="1.0" encoding="UTF-8"?>
  <projects type="array">
    <project>
      <amount type="decimal">20000.0</amount>
      <customer-id type="integer">1567</customer-id>
      <deal-date type="date">2008-04-09</deal-date>
      ...
    </project>
    <project>
      <amount type="decimal">57230.0</amount>
      <customer-id type="integer">1567</customer-id>
      <deal-date type="date">2008-04-15</deal-date>
      ...
    </project>
  </projects>

Otherwise the root element is "records":

  [{:foo => 1, :bar => 2}, {:baz => 3}].to_xml

  <?xml version="1.0" encoding="UTF-8"?>
  <records type="array">
    <record>
      <bar type="integer">2</bar>
      <foo type="integer">1</foo>
    </record>
    <record>
      <baz type="integer">3</baz>
    </record>
  </records>

If the collection is empty the root element is "nil-classes" by default:

  [].to_xml

  <?xml version="1.0" encoding="UTF-8"?>
  <nil-classes type="array"/>

To ensure a meaningful root element use the :root option:

  customer_with_no_projects.projects.to_xml(:root => "projects")

  <?xml version="1.0" encoding="UTF-8"?>
  <projects type="array"/>

By default root children have as node name the one of the root singularized. You can change it with the :children option.

The options hash is passed downwards:

  Message.all.to_xml(:skip_types => true)

  <?xml version="1.0" encoding="UTF-8"?>
  <messages>
    <message>
      <created-at>2008-03-07T09:58:18+01:00</created-at>
      <id>1</id>
      <name>1</name>
      <updated-at>2008-03-07T09:58:18+01:00</updated-at>
      <user-id>1</user-id>
    </message>
  </messages>

Show source

# File activesupport/lib/active_support/core_ext/array/conversions.rb, line 145
        def to_xml(options = {})
          raise "Not all elements respond to to_xml" unless all? { |e| e.respond_to? :to_xml }

          options[:root]     ||= all? { |e| e.is_a?(first.class) && first.class.to_s != "Hash" } ? first.class.to_s.underscore.pluralize : "records"
          options[:children] ||= options[:root].singularize
          options[:indent]   ||= 2
          options[:builder]  ||= Builder::XmlMarkup.new(:indent => options[:indent])

          root     = options.delete(:root).to_s
          children = options.delete(:children)

          if !options.has_key?(:dasherize) || options[:dasherize]
            root = root.dasherize
          end

          options[:builder].instruct! unless options.delete(:skip_instruct)

          opts = options.merge({ :root => children })

          xml = options[:builder]
          if empty?
            xml.tag!(root, options[:skip_types] ? {} : {:type => "array"})
          else
            xml.tag!(root, options[:skip_types] ? {} : {:type => "array"}) {
              yield xml if block_given?
              each { |e| e.to_xml(opts.merge!({ :skip_instruct => true })) }
            }
          end
        end

to_xml

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