ruby-on-rails-3.1 - 机械师 2 和脏跟踪

Question

不幸的是，似乎机械师与 Active Record 合作以某种方式绕过了脏跟踪。虽然我基于 after_save 回调进行了测试，但 tracked 属性必须明确设置，否则 tracked_changed？返回错误...有人有这方面的经验吗？

# in after_save tracked_changed? returns false
client = Client.make!(:tracked => "AAA")


# in after_save tracked_changed? returns true
client = Client.make!
client.tracked = "XXX"
client.save