How to properly use queryOrderedByValue

Question

I have this function written in Swift that fetch the leaderboard and then shows it to the user :

@IBAction func onShowLeaderboardTapped(_ sender: Any) {
             


        

Answer 1

Change the structure

scores
  -YUijia099sma
    name: "Ben"
    score: 9
  -Yij9a9jsffffd
    name: "Dimitar"
    score: 7

then

@IBAction func onShowLeaderboardTapped(_ sender: Any) {
        let leaderboardDB = FIRDatabase.database().reference().child("scores")
                           .queryOrdered(byChild: "score")
                           .queryLimited(toLast: 5)

        leaderboardDB.observeSingleEvent(of: .value, with: { (snapshot) in
            print("leaderboard snapshot:" ,snapshot)
        }, withCancel: nil)

    }

*typing on my iPad so it's not tested and the syntax may not be perfect