Fixed invalid call of NSManagedObject.fetchRequest()
#372
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Calling `NSManagedObject.fetchRequest()` is invalid: > This method is only legal to call on **subclasses of `NSManagedObject`** that represent a single entity in the model. https://developer.apple.com/documentation/coredata/nsmanagedobject/1640605-fetchrequest
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Calling
NSManagedObject.fetchRequest()is invalid:https://developer.apple.com/documentation/coredata/nsmanagedobject/1640605-fetchrequest
The proper way is to call good old
NSFetchRequest(entityName: self.entityName()), which gets bridged to the specializedNSFetchRequest<…>.