ios - 关注者计数器未更新 firebase 中的节点

Question

我一直在尝试在我的应用程序上实现“关注”功能。本质上，当用户点击“关注”按钮时，我们运行 runTransactionBlock 来更新我们存储在 Firebase 数据库中的用户及其关注帐户的整数值。 问题是我可以为用户更新计数器(比如下面例子中的 John)，但是我不能为我关注的用户更新计数器(比如下面例子中的 olivia)。

目前 Firebase 节点看起来是这样的:

user_profiles{
      UID1:{
           name: john
           following: 1 //code will update for my account
           followers: 0
      },
      UID2:{
           name: olivia
           following: 0
           followers: 0 //code will not update count for person i am trying to follow

我已经引用了以下内容，但是我仍然面临着让它工作的问题。如果有人可以浏览并指出正确的方向，将不胜感激。

https://www.firebase.com/docs/ios/guide/saving-data.html

Firebase database help - Swift

Upvote/Downvote system within Swift via Firebase

var guestUIDToPass = String()
var loggedInUser = AnyObject()

@IBAction func didTapFollow(sender: AnyObject) {
 following() 
}



func following() {

        self.loggedInUser = FIRAuth.auth()?.currentUser


//updating count for user, works perfectly        

self.databaseRef.child("user_profiles").child(self.loggedInUser.uid).child("following").runTransactionBlock({
            (currentData:FIRMutableData!) in
            var value = currentData.value as? Int
            if (value == nil) {
                value = 0
            }
            currentData.value = value! + 1
            return FIRTransactionResult.successWithValue(currentData)
        })

//updating count for person user is following, doesn't update firebase

        self.databaseRef.child("user_profiles").child("\(self.guestUIDToPass)").child("followers").runTransactionBlock({
            (currentData:FIRMutableData!) in
            var value = currentData.value as? Int
            if (value == nil) {
                value = 0
            }
            currentData.value = value! + 1
            return FIRTransactionResult.successWithValue(currentData)

        })
    }

Answer 1

尝试:-

let prntRef = FIRDatabase.database().reference().child("user_profiles").child(whomIFollowedUID).child("following")

prntRef.runTransactionBlock({ (following) -> FIRTransactionResult in
    if let followNum = following.value as? Int{

        following.value = followNum + 1
        return FIRTransactionResult.successWithValue(following)
    }else{

        return FIRTransactionResult.successWithValue(following)

    }
    }, andCompletionBlock: {(error,completion,snap) in

            print(error?.localizedDescription)
            print(completion)
            print(snap)
        if !completion {

            print("The value wasn't able to Update")
            }else{
            //Updated
        }
})