Ok, im a bit lost with this one, i am currently trying to run a background core data operation using a second ManagedObjectContext with its type set to NSPrivateQueueConcurrencyType and failing miserably with the above error.Ok, im a bit lost with this one, i am currently
阅读背景：
CoreData，另一个线程上的子MOC，意外:error: NULL _cd_rawData，但对象没有被转换成错误
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