I have a subclass of an NSManagedObject, and I'd like to add a couple ivars to keep track of some book-keeping. I don't want these vars to persist, and so that is why I don't include them as part of the data model.I have a subclass of an NSManagedObject, and I'
阅读背景：
将非持久性变量添加到nsmangedobject
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