使用 updateChildValues 更新 childByAutoId

Question

我正在尝试使用 childByAutoID 和 updateChildAt() 更新我的 firebase 数据库中的子节点。当我执行代码时，类型会更新，但是它位于节点之外，如下所示。

type: 3 应该在表示 type: 2 的节点内更新

我用来执行这个的代码看起来像

let DB_REF = Database.database().reference()
let WORK_PROG_REF = DB_REF.child("workInProgress")


    func completeJobProgress() {
    let workUser = self.workerUser
    let uid = Auth.auth().currentUser?.uid
    let workerId = workUser?.uid
    let address = workerUser?.address
    let createDate = Int(NSDate().timeIntervalSince1970)

    Database.database().reference().child("users").child(uid!).observeSingleEvent(of: .value, with: { (snapshot) in
        guard let dictionary = snapshot.value as? [String : Any] else { return }
        let user = User(dictionary: dictionary as [String : AnyObject])
        workUser?.uid = snapshot.key

        let docData: [String: Any] = ["workerId": uid!,
                                      "creationDate": createDate,
                                      "fromId" : workerId!,
                                      "location": address!,
                                      "type": 3,
                                      "checked": 0,]


        self.setJobToCompletedInDatabase(uid: uid!, values: docData as [String : AnyObject])
        self.postJobNotificationsIntoDatabseWithUID(uid: workerId!, values: docData as [String : AnyObject])


//how I initially got the type: 3 to save under the node was by using the line below 

WORK_PROG_REF.child(uid!).child("type").setValue(3)


        print(workerId!)

     }, withCancel: { (err) in
        print("attempting to load information")
        })

        print("Finished saving user info")
        self.dismiss(animated: true, completion: {
            print("Dismissal complete")
        })


    }

这只是将类型设置为节点下。我尝试使用下面的代码，但在下面的行中，我收到错误 Cannot convert value of type 'String' to expected argument type '[AnyHashable: Any]'

     WORK_PROG_REF.child(uid!).updateChildValues("type").setValue(3)

感谢大家的帮助

Answer 1

试试：

事务解决方案：

WORK_PROG_REF.child(uid!).child("-M1bOYAcP_IMFbgz8siD").runTransactionBlock({ (result: MutableData) -> TransactionResult in
            if var objInfo = result.value as? [String: Any] {
                objInfo["type"] = 3

                // Set value and report transaction success
                result.value = objInfo

                return TransactionResult.success(withValue: result)
            }else{
                return TransactionResult.success(withValue: result)
            }
        }) { (error,completion,snap) in
            //Handle Error
        }

没有事务的解决方案：

WORK_PROG_REF.child(uid!).child("-M1bOYAcP_IMFbgz8siD"). child("type").setValue(3)

希望这能解决您的问题。