Updating Existing Object in Firebase with Swift 3

Question

I've been having trouble saving an object pulled in from Firebase. I want to grab the value of 'cardAmount', add to it and save it. But it keeps giving me trouble about it not being ale to convert a number to a string. I think I might be hung up on modifying the data structure wrong, but I've been stuck on this for a little while - can anyone give me some guidance on how to edit a single Child Snapshot in Firebase as I need it?

let sevenDayOption = UIAlertAction(title: "Seven Day: $31", style: .default, handler: { (alert: UIAlertAction!) -> Void in let query = ref.queryOrdered(byChild: (FIRAuth.auth()!.currentUser?.uid)!) query.observeSingleEvent(of: .value, with: { (snapshot) in let cardAmount = snapshot.childSnapshot(forPath: "cardAmount").value as! Float let newAmount = cardAmount + 31 let newAmountString = String(format:"%.2f", newAmount) snapshot.setValue(newAmountString, forKeyPath: snapshot.childSnapshot(forPath: "cardAmount").value as! String) print(snapshot.childSnapshot(forPath: "cardAmount").value as! Float) /*<---- Prints Optional(30.5)*/ }) })

I'm sure it's probably something simple, but it's also something that eludes me at the moment. Relatively new to Firebase and Swift so its been a bit of a challenge wrestling with it at times.

Thanks!

there is runTransactionBlock. Or you can use updateChildValues method — Wolverine
– Wolverine, Commented Nov 30, 2016 at 12:58
updateChildValues worked perfectly! Submitting answer. Thank you so much! — Studio Symposium
– Studio Symposium, Commented Nov 30, 2016 at 13:16

Studio Symposium · Accepted Answer · 2016-11-30 13:18:10Z

For those of you who come across this and have trouble in the future - the answer came from the updateChildValues method that Firebase offers:

let sevenDayOption = UIAlertAction(title: "Seven Day: $31", style: .default, handler: { (alert: UIAlertAction!) -> Void in let query = ref.queryOrdered(byChild: (FIRAuth.auth()!.currentUser?.uid)!) query.observeSingleEvent(of: .value, with: { (snapshot) in let cardAmount = snapshot.childSnapshot(forPath: "cardAmount").value as! Float let newAmount = cardAmount + 31 let newAmountString = String(format:"%.2f", newAmount) ref.updateChildValues(["cardAmount":newAmountString])/*<------ CRITICAL*/ }) })

Thank you so much!

SymbolixAU · Accepted Answer · 2017-09-06 10:09:38Z

Try this code

ref.child("yourKey").child("yourKey").updateChildValues(["cardAmount": yourNewCardAmount])

This worked for me. Hope will help someone...

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