Having trouble trying to obtain value from Firebase - swift

Question

I'm trying to get a value inside a Firebase database I set up but I'm having issues trying get it out. There is a section in my program where I go through each child under Cities and obtain the the name of each city. I thought it would be a good idea to try to obtain the status for each city in the same section but I can't get it out. Below is a sample of the JSON object. I feel like I'm close but missing something to put it all together.
"Users" : {
"NPNBig20BXNpX4Rz0UbMyiKAarY2" : {
"Cities" : {
"New York City" : {
"Status" : "Empty"
},
"Atlanta" : {
"Status" : "Empty"
},
"Test City" : {
"Status" : "Wow",
"Value" : "Test"
}
},
"Email" : "fakeemail#gmail.com"
}
}
Code:
guard let uid = userID else { return }
let databaseRef = Database.database().reference(fromURL: "https://testApp.firebaseio.com/").child("Users").child(uid).child("Cities")
var dataTest : [String] = []
//var cityDictionary: [String:String]()
databaseRef.observeSingleEvent(of: .value, with: {(snapshot) in
for child in snapshot.children {
let snap = child as! DataSnapshot
let key = snap.key
guard let value = snap.value else { return }
//let testData = value["Status"] **Type Any has no subscript
print("Key: ", key, "\nValue: ", value)
dataTest.append(key)
}
completion(dataTest)
})
This is the printed output
Key: New York City
Value: {
Status = Empty;
}
Key: Sintra
Value: {
Status = Empty;
}
Key: Test City
Value: {
Status = Wow;
Value = Test;
}

Answer 1

Here is the way you can get Status from your value:
if let value = snap.value as? [String: AnyObject] {
let Status = value["Status"] as? String ?? ""
}
And your complete code will be:
guard let uid = userID else { return }
let databaseRef = Database.database().reference(fromURL: "https://testApp.firebaseio.com/").child("Users").child(uid).child("Cities")
var dataTest : [String] = []
//var cityDictionary: [String:String]()
databaseRef.observeSingleEvent(of: .value, with: {(snapshot) in
for child in snapshot.children {
let snap = child as! DataSnapshot
let key = snap.key
guard let value = snap.value else { return }
//let testData = value["Status"] **Type Any has no subscript
if let value = snap.value as? [String: AnyObject] {
let Status = value["Status"] as? String ?? ""
}
print("Key: ", key, "\nValue: ", value)
dataTest.append(key)
}
completion(dataTest)
})

Answer 2

func handleGetCities(_ completion: #escaping ([String]) -> ()) {
guard let uid = Auth.auth().currentUser?.uid else { return }
// OR
guard let uid = userID else { return }
// THEN
var data: [String] = []
let reference = Database.database().reference()
reference.child("Users").child(uid).child("Cities").observe(.childAdded, with: { (snapshot) in
let city_name = snapshot.key
data.append(city_name)
completion(data)
}, withCancel: nil)
}