Fix that changing a store should mark the store attribute as changed

activerecord/lib/active_record/store.rb

@@ -37,6 +37,7 @@ def store_accessor(store_attribute, *keys)
         Array(keys).flatten.each do |key|
           define_method("#{key}=") do |value|
             send(store_attribute)[key] = value
+            send("#{store_attribute}_will_change!")
           end
     
           define_method(key) do

activerecord/test/cases/store_test.rb

@@ -26,4 +26,9 @@ class StoreTest < ActiveRecord::TestCase
 
     assert 'graeters', @john.reload.settings[:icecream]
   end
+  
+  test "updating the store will mark it as changed" do
+    @john.color = 'red'
+    assert @john.settings_changed?
+  end
 end