iterate over users in firebase database - ios

Question

I am trying to iterate over the users' information where and save it in an Object.
Here is my data
{
"users" : {
"ApC2wS444YbEEUt5BOpFjkn7YTD3" : {
"UserInfo" : {
"lat" : 123123,
"long" : 0,
"petAge" : 5,
"petNeme" : "zhshs"
}
},
"doRJjseSogNJrCQ55zMGlJwj6jh2" : {
"UserInfo" : {
"UID" : "doRJjseSogNJrCQ55zMGlJwj6jh2",
"lat" : 0,
"long" : 0,
"petAge" : 5,
"petName" : "BBB"
}
}
}
}
My code is like this
ref = Database.database().reference()
tableView.delegate = self
tableView.dataSource = self
let userID = Auth.auth().currentUser?.uid
ref = Database.database().reference()
self.ref.child("users").observeSingleEvent(of: .value, with: { (snapshot) in
// Get user value
for child in snapshot.children.allObjects as! [DataSnapshot] {
print(child.value)
let value = snapshot.value as! NSDictionary
let userInfo = value[0] as! NSDictionary
let UID = userInfo["UID"] as! String
let lat = userInfo["lat"] as! Double
let long = userInfo["long"] as! Double
let name = userInfo["petName"] as! String ?? ""
let age = userInfo["petAge"] as! Double
}
}) { (error) in
print(error.localizedDescription)
}
I don't really understand how I should handle snapshots and how to get the data properly
I was able to a fetch a single node but when I try to pass iterate, it brings me back the same node with every iteration
Any help?

Answer 1

In your example you use in a for loop this let userInfo = value[0] as! NSDictionary which later gives you only the first node: [0].
Also let me show you my example of retrieving data from a snapshot (in my case I have cards with autoId):
func loadDataFromDb(completion: #escaping ([Card])->()) {
var cards: [Card] = []
let userRef = getCurrentUserRef()
usersRef.child(userRef).child(Paths.cards).observeSingleEvent(of: .value) { (snapshot) in
for child in snapshot.children {
if let snapshot = child as? DataSnapshot,
let card = Card(snapshot: snapshot) {
cards.append(card)
}
}
completion(cards)
}
}
Also I have failable init in Card:
private enum Constants {
static let name = "name"
static let barcode = "barcode"
}
final class Card {
let name: String
let barcode: String
init(_ name: String, barcode: String) {
self.name = name
self.barcode = barcode
}
init?(snapshot: DataSnapshot) {
guard let value = snapshot.value as? [String : AnyObject],
let name = value[Constants.name] as? String,
let barcode = value[Constants.barcode] as? String else {
return nil
}
self.name = name
self.barcode = barcode
}
}