How to parse Optional Json to String variables

Question

I am trying to get data from my database using Firebase. I am unsure how to unwrap and assign the variables. I am trying to have a title on the top of the screen based on the name imported, likes, and playing the video.

When I print the variable jdata it prints the Optional JSON from the firebase.

import Foundation
import SwiftUI
import AVKit
import Firebase


struct PlayerView: View {
    
    @State var likes: Int = 0
    @State var name: String = ""
    @State var url: String = ""
    @State let player = AVPlayer(url: URL(string: url))
    
    func liked() { likes += 1 }
    func update() {
        FirebaseApp.configure()
        let root = Database.database().reference()
        root.observeSingleEvent(of: .value, with: { (snapshot) in
            if let data = snapshot.value as? [String: Any] {
                let jdata = data["urls"] // Optional JSON
                print(jdata)
            }
        })
            
        
    }

    var body: some View {
        
        VStack{
            Text(name)
            VideoPlayer(player: player).padding()
        
            HStack {
                Button("Like", action: liked).padding()
                Text(String(likes)).padding()
            }
            HStack {
                Button("Prev"){}.padding()
                Button("Next"){}.padding()
            }
            Button(action: update) {
                Text("Update Database")
                
            }.padding()

        }
    }
}

My variable after it prints Optional({"-N25GwfJ9Cj7IlfkFNpL" = { likes = 0; name = "NameTest"; url = "Testing"; }; })

are you going to do your old trick, get the answer to the question, then delete the question, like you did last time? — workingdog support Ukraine
– workingdog support Ukraine, Commented May 16, 2022 at 2:39
Since you haven't included your schema, it's tough to say exactly how to parse it. If "urls" contains a single String, you could do if let jdata = data["urls"] as? String { self.url = jdata }. If it contains multiple URLs, as the name implies, you'd have to decide which item you want. — jnpdx
– jnpdx, Commented May 16, 2022 at 3:33
@workingdogsupportUkraine Hi again! I deleted the question because I received negative reviews on it. I assumed this platform is like Reddit and I did not want to have a bad question as the negative review was indicating. I thought I might have made a mistake posting the question since it was moved past the original question. Leading to making it harder to read for other people. That is why I deleted the previous question. Your help has been unbelievable, especially with understanding the language itself. Regardless, thank you for your time. — TheStudentProgrammer
– TheStudentProgrammer, Commented May 16, 2022 at 3:33
@jnpdx My JSON when I print it looks like this. Optional({"-N25GwfJ9Cj7IlfkFNpL" = { likes = 0; name = "Name "; url = "Jaded;kjashdfkljhwe;ifugweiufhwie"; }; }) I have tried using the data["urls"]["name"] syntax but this was not working for me. — TheStudentProgrammer
– TheStudentProgrammer, Commented May 16, 2022 at 3:36
Looks like you have a document keyed by id. You need to get the document out first, then query the properties on it. — jnpdx
– jnpdx, Commented May 16, 2022 at 3:42

workingdog support Ukraine · Accepted Answer · 2022-05-16 05:15:23Z

1

based on the data you show, you could try this (untested) approach:

root.observeSingleEvent(of: .value, with: { snapshot in
    if let data = snapshot.value as? [String: Any],
        let jdata = data["urls"] as? [String: Any] {
        if let key = jdata.keys.first,
           let result = jdata[key] as? [String: Any] {
            print("-----> result: \(result)")
            if let likes = result["likes"] {
                print("-----> likes: \(likes)")
            }
        }
    }
  })

answered May 16, 2022 at 5:15

workingdog support Ukraine

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