Make String equality check work for Type::Data values

Author: Attila Horváth

lib/active_record/connection_adapters/sqlserver/type/string.rb

@@ -4,6 +4,13 @@ module SQLServer
       module Type
         class String < ActiveRecord::Type::String
 
+          def changed_in_place?(raw_old_value, new_value)
+            if raw_old_value.is_a?(Data)
+              raw_old_value.value != new_value
+            else
+              super
+            end
+          end
 
         end
       end

test/cases/column_test_sqlserver.rb

@@ -798,6 +798,12 @@ def assert_obj_set_and_save(attribute, value)
       obj.save!
     end
 
+    it 'does not mark object as changed after save' do
+      obj.save!
+      obj.attributes
+      obj.changed?.must_equal false
+    end
+
   end
 
 end