3 files changed, 15 insertions, 1 deletions
diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index 2a3c51172b..d3056e73a2 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,3 +1,16 @@
+## Rails 3.2.9 (unreleased)
+
+*   Due to a change in builder, nil values and empty strings now generates
+    closed tags, so instead of this:
+
+        <pseudonyms nil=\"true\"></pseudonyms>
+
+    It generates this:
+
+        <pseudonyms nil=\"true\"/>
+
+    *Carlos Antonio da Silva*
+
 ## Rails 3.2.8 (Aug 9, 2012) ##
 
 *   No changes.
diff --git a/activemodel/lib/active_model/validations.rb b/activemodel/lib/active_model/validations.rb
index f38121c175..45d8677fa0 100644
--- a/activemodel/lib/active_model/validations.rb
+++ b/activemodel/lib/active_model/validations.rb
@@ -5,6 +5,7 @@ require 'active_support/core_ext/hash/keys'
 require 'active_support/core_ext/hash/except'
 require 'active_model/errors'
 require 'active_model/validations/callbacks'
+require 'active_model/validator'
 
 module ActiveModel
 
diff --git a/activemodel/test/cases/serializers/xml_serialization_test.rb b/activemodel/test/cases/serializers/xml_serialization_test.rb
index 38aecf51ff..7f14b21cf4 100644
--- a/activemodel/test/cases/serializers/xml_serialization_test.rb
+++ b/activemodel/test/cases/serializers/xml_serialization_test.rb
@@ -132,7 +132,7 @@ class XmlSerializationTest < ActiveModel::TestCase
   end
 
   test "should serialize nil" do
-    assert_match %r{<pseudonyms nil=\"true\"></pseudonyms>}, @contact.to_xml(:methods => :pseudonyms)
+    assert_match %r{<pseudonyms nil=\"true\"/>}, @contact.to_xml(:methods => :pseudonyms)
   end
 
   test "should serialize integer" do