NSManagedObject init(context:) bug?

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I take advantage of init(context): to create Worker occasion success. However It has an additional Worker occasion in reminiscence and might’t launch.

 let context = coreDataStack.coreContext
 let worker = Worker(context: context)
 worker.key = 123

error’s Worker occasion in reminiscence

Now, I take advantage of init(entity:insertInto:) to create Worker the result’s right.

  let context = coreDataStack.coreContext
  let worker = NSEntityDescription.insertNewObject(forEntityName: "Worker", into: context) as! Worker
// let worker = Worker(context: context)
  worker.key = 123

no Worker occasion in reminiscence

So, What’s the issue right here?

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