Question

我一直在尝试在我的应用上实现“关注”功能。实际上，当用户点击“关注”按钮时，我们运行runTransactionBlock来更新我们存储在Firebase数据库中的整数值，以供用户及其关注的帐户使用。 问题是我能够为用户更新计数器（比如下面的例子中的John），但是我无法为我正在关注的用户更新计数器（例如下面的示例中的olivia）。

目前，Firebase节点看起来像这样：

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。如果有人可以请一瞥并指出我正确的方向，我将不胜感激。

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
        }
})

追随者计数器未更新firebase

1 个答案: