Trying to rewrite a category on NSManagedObject in Swift

swift_nsmanagedobject_extension.swift

// Objective-C
@implementation NSManagedObject (Helpers)
+ (instancetype)createEntity
{
	id newObject = [NSEntityDescription
		insertNewObjectForEntityForName:[[self class] description]
		inManagedObjectContext:[[SACoreDataStack defaultStack]
		managedObjectContext]];
	return newObject;
}
@end

// Swift
extension NSManagedObject {
	class func createEntity() -> Self {
		return NSEntityDescription.insertNewObjectForEntityForName(self.description(),
			inManagedObjectContext: CoreDataStack.defaultStack.managedObjectContext)
		// Error on the above line: "'AnyObject' is not convertible to 'Self'"
	}
}

Any issue with using AnyObject as the return type?

@iosengineer I think it would be nice to wrap the requisite type casting in the factory method implemented as an extension of NSManagedObject and not on each subclass. Have any thoughts on how to approach this using generics?