fixed nil assign bug

lib/globalize/model/active_record/adapter.rb

@@ -1,6 +1,12 @@
 module Globalize
   module Model
     class AttributeStash < Hash
+      def contains?(locale, attr_name)
+        locale = locale.to_sym
+        self[locale] ||= {}
+        self[locale].has_key? attr_name        
+      end
+
       def read(locale, attr_name)
         locale = locale.to_sym
         self[locale] ||= {}
@@ -25,7 +31,8 @@ def initialize(record)
 
       def fetch(locale, attr_name)
         # locale = I18n.locale
-        @cache.read(locale, attr_name) || begin
+        is_cached = @cache.contains?(locale, attr_name)
+        is_cached ? @cache.read(locale, attr_name) : begin
           value = fetch_attribute locale, attr_name
           @cache.write locale, attr_name, value if value && value.locale == locale
           value

test/model/active_record/translated_test.rb

@@ -268,6 +268,13 @@ def teardown
     post.subject = 'baz'
     assert_equal 'foo', post.reload.subject    
   end
+
+  test 'complex writing and stashing' do
+    post = Post.create :subject => 'foo', :content => 'bar'
+    post.subject = nil
+    assert_nil post.subject
+    assert !post.valid?    
+  end
 end
 
 # TODO should validate_presence_of take fallbacks into account? maybe we need