Skip to content
This repository
tag: v3.2.13.rc2
Fetching contributors…

Cannot retrieve contributors at this time

file 204 lines (173 sloc) 6.594 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204
require 'active_support/core_ext/array/wrap'
require 'active_support/core_ext/class/attribute_accessors'
require 'active_support/core_ext/array/conversions'
require 'active_support/core_ext/hash/conversions'
require 'active_support/core_ext/hash/slice'

module ActiveModel
  module Serializers
    # == Active Model XML Serializer
    module Xml
      extend ActiveSupport::Concern
      include ActiveModel::Serialization

      included do
        extend ActiveModel::Naming
      end

      class Serializer #:nodoc:
        class Attribute #:nodoc:
          attr_reader :name, :value, :type

          def initialize(name, serializable, value)
            @name, @serializable = name, serializable
            value = value.in_time_zone if value.respond_to?(:in_time_zone)
            @value = value
            @type = compute_type
          end

          def decorations
            decorations = {}
            decorations[:encoding] = 'base64' if type == :binary
            decorations[:type] = (type == :string) ? nil : type
            decorations[:nil] = true if value.nil?
            decorations
          end

        protected

          def compute_type
            return if value.nil?
            type = ActiveSupport::XmlMini::TYPE_NAMES[value.class.name]
            type ||= :string if value.respond_to?(:to_str)
            type ||= :yaml
            type
          end
        end

        class MethodAttribute < Attribute #:nodoc:
        end

        attr_reader :options

        def initialize(serializable, options = nil)
          @serializable = serializable
          @options = options ? options.dup : {}
        end

        def serializable_hash
          @serializable.serializable_hash(@options.except(:include))
        end

        def serializable_collection
          methods = Array.wrap(options[:methods]).map(&:to_s)
          serializable_hash.map do |name, value|
            name = name.to_s
            if methods.include?(name)
              self.class::MethodAttribute.new(name, @serializable, value)
            else
              self.class::Attribute.new(name, @serializable, value)
            end
          end
        end

        def serialize
          require 'builder' unless defined? ::Builder

          options[:indent] ||= 2
          options[:builder] ||= ::Builder::XmlMarkup.new(:indent => options[:indent])

          @builder = options[:builder]
          @builder.instruct! unless options[:skip_instruct]

          root = (options[:root] || @serializable.class.model_name.element).to_s
          root = ActiveSupport::XmlMini.rename_key(root, options)

          args = [root]
          args << {:xmlns => options[:namespace]} if options[:namespace]
          args << {:type => options[:type]} if options[:type] && !options[:skip_types]

          @builder.tag!(*args) do
            add_attributes_and_methods
            add_includes
            add_extra_behavior
            add_procs
            yield @builder if block_given?
          end
        end

      private

        def add_extra_behavior
        end

        def add_attributes_and_methods
          serializable_collection.each do |attribute|
            key = ActiveSupport::XmlMini.rename_key(attribute.name, options)
            ActiveSupport::XmlMini.to_tag(key, attribute.value,
              options.merge(attribute.decorations))
          end
        end

        def add_includes
          @serializable.send(:serializable_add_includes, options) do |association, records, opts|
            add_associations(association, records, opts)
          end
        end

        # TODO This can likely be cleaned up to simple use ActiveSupport::XmlMini.to_tag as well.
        def add_associations(association, records, opts)
          merged_options = opts.merge(options.slice(:builder, :indent))
          merged_options[:skip_instruct] = true

          if records.is_a?(Enumerable)
            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

        def add_procs
          if procs = options.delete(:procs)
            Array.wrap(procs).each do |proc|
              if proc.arity == 1
                proc.call(options)
              else
                proc.call(options, @serializable)
              end
            end
          end
        end
      end

      # Returns XML representing the model. Configuration can be
      # passed through +options+.
      #
      # Without any +options+, the returned XML string will include all the model's
      # attributes. For example:
      #
      # user = User.find(1)
      # user.to_xml
      #
      # <?xml version="1.0" encoding="UTF-8"?>
      # <user>
      # <id type="integer">1</id>
      # <name>David</name>
      # <age type="integer">16</age>
      # <created-at type="datetime">2011-01-30T22:29:23Z</created-at>
      # </user>
      #
      # The <tt>:only</tt> and <tt>:except</tt> options can be used to limit the attributes
      # included, and work similar to the +attributes+ method.
      #
      # To include the result of some method calls on the model use <tt>:methods</tt>.
      #
      # To include associations use <tt>:include</tt>.
      #
      # For further documentation see activerecord/lib/active_record/serializers/xml_serializer.xml.
      def to_xml(options = {}, &block)
        Serializer.new(self, options).serialize(&block)
      end

      def from_xml(xml)
        self.attributes = Hash.from_xml(xml).values.first
        self
      end
    end
  end
end
Something went wrong with that request. Please try again.