Added yielding of Builder instance for ActiveRecord::Base#to_xml calls [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6519 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

 *SVN*
 
+* Added yielding of Builder instance for ActiveRecord::Base#to_xml calls [DHH]
+
 * Small additions and fixes for ActiveRecord documentation.  Closes #7342 [jeremymcanally]
 
 * Add helpful debugging info to the ActiveRecord::StatementInvalid exception in ActiveRecord::ConnectionAdapters::SqliteAdapter#table_structure.  Closes #7925. [court3nay]

activerecord/lib/active_record/xml_serialization.rb

@@ -90,6 +90,23 @@ module XmlSerialization
     #     <abc>def</abc>
     #   </firm>
     #
+    # Alternatively, you can also just yield the builder object as part of the to_xml call:
+    #
+    #   firm.to_xml do |xml|
+    #     xml.creator do
+    #       xml.first_name "David"
+    #       xml.last_name "Heinemeier Hansson"
+    #     end
+    #   end
+    #
+    #   <firm>
+    #     # ... normal attributes as shown above ...
+    #     <creator>
+    #       <first_name>David</first_name>
+    #       <last_name>Heinemeier Hansson</last_name>
+    #     </creator>
+    #   </firm>
+    #
     # You may override the to_xml method in your ActiveRecord::Base
     # subclasses if you need to.  The general form of doing this is
     #
@@ -103,8 +120,9 @@ module XmlSerialization
     #       end
     #     end
     #   end
-    def to_xml(options = {})
-      XmlSerializer.new(self, options).to_s
+    def to_xml(options = {}, &block)
+      serializer = XmlSerializer.new(self, options)
+      block_given? ? serializer.to_s(&block) : serializer.to_s
     end
   end
 
@@ -231,6 +249,7 @@ def serialize
         add_attributes
         add_includes
         add_procs
+        yield builder if block_given?
       end
     end        
     

activerecord/test/xml_serialization_test.rb

@@ -56,6 +56,14 @@ def test_should_allow_attribute_filtering
     assert_no_match %r{<age},     @xml
     assert_match %r{<created-at}, @xml
   end
+  
+  def test_should_include_yielded_additions
+    @xml = Contact.new.to_xml do |xml|
+      xml.creator "David"
+    end
+
+    assert_match %r{<creator>David</creator>}, @xml
+  end
 end
 
 class DefaultXmlSerializationTest < Test::Unit::TestCase