Detect in-place changes on mutable AR attributes

We have several mutable types on Active Record now. (Serialized, JSON,
HStore). We need to be able to detect if these have been modified in
place.

1 files changed, 10 insertions, 1 deletions

diff --git a/activerecord/test/cases/dirty_test.rb b/activerecord/test/cases/dirty_test.rb
index 87f24e32b2..5d6601a881 100644
--- a/activerecord/test/cases/dirty_test.rb
+++ b/activerecord/test/cases/dirty_test.rb
@@ -445,11 +445,20 @@ class DirtyTest < ActiveRecord::TestCase
   def test_save_should_store_serialized_attributes_even_with_partial_writes
     with_partial_writes(Topic) do
       topic = Topic.create!(:content => {:a => "a"})
+
+      assert_not topic.changed?
+
       topic.content[:b] = "b"
-      #assert topic.changed? # Known bug, will fail
+
+      assert topic.changed?
+
       topic.save!
+
+      assert_not topic.changed?
       assert_equal "b", topic.content[:b]
+
       topic.reload
+
       assert_equal "b", topic.content[:b]
     end
   end