Problem while retrieving info from Firebase Database IOS - swift

Question

I'm trying to retrieve data from my Database but I'm having some problems, this is my database structure:
And here is my code
var ref : DatabaseReference
var idString = [String]()
ref = Database.database().reference()
ref.child("idUsers").observe(.value){ (snapshot) in
let id = snapshot.value as? String
if let ids = id {
idString.append(ids)
print(ids)
}
}
But no data is going into my array, I have been trying some solutions but no one works, please help! These are my rules by the way, they are public by default.
{
"rules": {
".read": true,
".write": true
}
}

Answer 1

Since idUsers contains multiple child nodes, you need to loop over the results in your code. Something like this:
ref.child("idUsers").observe(.value){ (snapshot) in
for userSnapshot in in snapshot.children.allObjects as? [DataSnapshot] {
let id = userSnapshot.value as? String
print(id)
idString.append(id)
}
print(ids)
}

Answer 2

**For creating database structure**
`override func viewDidLoad() {
var ref: DatabaseReference!
ref = Database.database().reference()
Auth.auth().createUser(withEmail: email, password: password) { authResult, error in
Auth.auth().signIn(withEmail: email, password: password) { [weak self] user, error in
guard self != nil else { return }
ref.child("users").setValue(["test1": "abc",
"test2": "efg",
"test3": "hij"])
}
}
}`
**// For retrieving data from firebase**
ref.observe(DataEventType.value, with: { (snapshot) in
let postDict = snapshot.value as? [String : AnyObject] ?? [:]
for item in postDict {
print(item)
}
})