Firebase JSON Tree Data Retrieval in Swift - swift

Question

My Firebase data structure looks like:
The following code works to update the value of the label to be the current value of condition:
import UIKit
import Firebase
class ViewController: UIViewController {
let conditionRef = Database.database().reference().child("condition")
#IBOutlet weak var conditionLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
conditionRef.observe(.value) {
(snap: DataSnapshot) in
self.conditionLabel.text = (snap.value as! String).description
}
}
I want to update the value of the label to be that of test2. I've tried a lot of things, but the thing that made most sense to me was changing the constant conditionRef to:
let conditionRef = Database.database().reference().child("test1").child("test2")
This didn't work, and I'm not sure what will. I've gone through the Firebase documentation and multiple YouTube tutorials but can't seem to figure this trivial detail out.
Any help will be greatly appreciated, thanks in advance.

Answer 1

One solution is to create a reference to the node you want the value of and then observe it with a single event like this:
class ViewController: UIViewController {
var ref: DatabaseReference!
override func viewDidLoad() {
super.viewDidLoad()
self.ref = Database.database().reference()
let test2Ref = self.ref.child("fir-2-b1233").child("test1").child("test2")
test2Ref.observeSingleEvent(of: .value, with: { snapshot in
let val = snapshot.value as! Int
print(val)
})
}
}
The key is to ensure you include the entire path to the child node you want the data from.
and my Firebase Stucture
{
"fir-2-b1233" : {
"condition" : "foggy",
"test1" : {
"test2" : 0,
"test3" : 0
}
}
}