如何从CoreData NSManagedObject获取CloudKit CKRecord？

extension NSManagedObject {
    func toCKRecord() -> CKRecord? {
        guard let entityName = entity.name else {
            return nil
        }
        
        let recordID = CKRecord.ID(recordName: objectID.uriRepresentation().absoluteString)
        let record = CKRecord(recordType: entityName, recordID: recordID)
        
        // 将NSManagedObject的属性映射到CKRecord的字段
        for (key, value) in entity.attributesByName {
            if let attributeValue = self.value(forKey: key) {
                record.setValue(attributeValue, forKey: key)
            }
        }
        
        // 处理关系属性
        for (key, value) in entity.relationshipsByName {
            if let relationshipValue = self.value(forKey: key) as? NSManagedObject {
                let relationshipRecordID = CKRecord.ID(recordName: relationshipValue.objectID.uriRepresentation().absoluteString)
                let relationshipReference = CKRecord.Reference(recordID: relationshipRecordID, action: .none)
                record.setValue(relationshipReference, forKey: key)
            }
        }
        
        return record
    }
}

let managedObjectContext = persistentContainer.viewContext
let fetchRequest: NSFetchRequest<NSManagedObject> = NSFetchRequest(entityName: "YourEntity")
let results = try? managedObjectContext.fetch(fetchRequest)

if let objects = results {
    for object in objects {
        if let record = object.toCKRecord() {
            // 在这里可以使用CKRecord进行进一步的操作，比如上传到CloudKit
            // 例如：CKContainer.default().publicCloudDatabase.save(record)
        }
    }
}