1 files changed, 9 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations/has_one_association.rb b/activerecord/lib/active_record/associations/has_one_association.rb
index 501ebe7c5b..56f9013d61 100644
--- a/activerecord/lib/active_record/associations/has_one_association.rb
+++ b/activerecord/lib/active_record/associations/has_one_association.rb
@@ -11,7 +11,7 @@ module ActiveRecord
         # If target and record are nil, or target is equal to record,
         # we don't need to have transaction.
         if (target || record) && target != record
-          reflection.klass.transaction do
+          transaction_if(save) do
             remove_target!(options[:dependent]) if target && !target.destroyed?
   
             if record
@@ -70,6 +70,14 @@ module ActiveRecord
         def nullify_owner_attributes(record)
           record[reflection.foreign_key] = nil
         end
+
+        def transaction_if(value)
+          if value
+            reflection.klass.transaction { yield }
+          else
+            yield
+          end
+        end
     end
   end
 end