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@@ -134,7 +134,9 @@ module ActiveRecord
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       def update_with_dirty
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         if partial_updates?
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-          update_without_dirty(changed)
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+          # Serialized attributes should always be written in case they've been
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+          # changed in place.
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+          update_without_dirty(changed | self.class.serialized_attributes.keys)
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         else
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           update_without_dirty
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         end

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@@ -191,6 +191,18 @@ class DirtyTest < ActiveRecord::TestCase
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     assert !pirate.changed?
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   end
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+  def test_save_should_store_serialized_attributes_even_with_partial_updates
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+    with_partial_updates(Topic) do
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+      topic = Topic.create!(:content => {:a => "a"})
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+      topic.content[:b] = "b"
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+      #assert topic.changed? # Known bug, will fail
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+      topic.save!
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+      assert_equal "b", topic.content[:b]
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+      topic.reload
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+      assert_equal "b", topic.content[:b]
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+    end
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+  end
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+
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   private
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     def with_partial_updates(klass, on = true)
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       old = klass.partial_updates?