For testing reasons, I want to check that one of my methods doesn't update a specific entry in my database. Is there a simple way to ask an instance of an ActiveRecord model if its in sync with the database? for instance, if we had a method foobar? that could do this:For testing reasons, I want to check that one o
阅读背景：
如何检查ActiveRecord模型的实例是否是最新的？
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