轨道3。活动记录。登录中。显示SQL事务块

如何在Rails记录器中使用SQL事务块?

例如,我有以下事务:

>> Client.transaction do
?> Client.find_by_name('Pavel').withdraw(2000)
>> Client.find_by_name('Elena').deposit(2000)
>> raise ActiveRecord::Rollback
>> end
=> nil

完成工作后,下一行将添加到 :

SQL (0.4ms)  UPDATE "balances" SET "amount" = 8000 WHERE ("balances"."id" = 1)
SQL (0.2ms)  UPDATE "balances" SET "amount" = 7000 WHERE ("balances"."id" = 2)

它应该如下所示:

BEGIN;
  UPDATE "balances" SET "amount" = 8000 WHERE ("balances"."id" = 1);
  UPDATE "balances" SET "amount" = 7000 WHERE ("balances"."id" = 2);
ROLLBACK;

在使用事务时,如何获取正确的SQL输出?

谢谢

Debian GNU/Linux 5.0.6;

Ruby 1.9.2;

Sqlite 3.7.3。