How to retrieve data from all the Users using Firebase and Swift - swift

Question

i have a firebase databank looking like this(Json):
{
"user" : {
"UVHpZfD60EWcYDbeV60ENqXaioA3" : {
"email" : "thisisanothertest#gg.gg",
"location" : {
"latitude" : 37.785834,
"longitude" : -122.406417
},
"profile" : {
"alter" : "23",
"geschlecht" : "männlich",
"name" : "Mario1"
}
},
"nEsKd9uIOnSmVuMbAK0K2X1Dz6A3" : {
"email" : "thisisatest#gg.gg",
"location" : {
"latitude" : 37.785834,
"longitude" : -122.406417
},
"profile" : {
"alter" : "23",
"geschlecht" : "männlich ",
"name" : "Mario"
}
}
}
Problem:
Now i would like to get the Locations from all the users (latitude and longitude) to place them later on on a Map.
I can get the location for a single user realy easy by doing the below code. But how can i get the data from all the users at once?
var ref: DatabaseReference!
ref = Database.database().reference()
let userID = Auth.auth().currentUser?.uid
ref.child("user").child(userID!).child("location").observeSingleEvent(of: .value, with: { (snapshot) in
// Get user value
let value = snapshot.value as? NSDictionary
let lat = value?["latitude"] as? Double ?? 0.0
let long = value?["longitude"] as? Double ?? 0.0
I found a similar question already here
So i tried that code from the above link:
let usersRef = ref.child("users")
usersRef.observeSingleEvent(of: .value, with: { (snapshot) in
for snap in snapshot.children {
let userSnap = snap as! FIRDataSnapshot
let uid = userSnap.key //the uid of each user
let userDict = userSnap.value as! [String:AnyObject] //child data
let location = userDict["Location"] as! String
print("key = \(uid) is at location = \(location)")
}
})
But with that pice of code i was only able to get all the email adresses. By changing the "Location" to "email". How can i go down one more node to access the "location" node and get the latitude and longitude of all the users?
Thank you :)

Answer 1

Looks like you misspelled the location key for your dictionary:
let location = userDict["Location"] as! [String: AnyObject]
Replace it with:
let location = userDict["location"] as! [String: AnyObject]
You can always put a breakpoint at the print line and see what your location dictionary looks like with po location in console.

Answer 2

As you can see in your data location is stored as another object, so you have to cast it as Dictionary => [String:AnyObject]
for snap in snapshot.children {
let userSnap = snap as! FIRDataSnapshot
let uid = userSnap.key //the uid of each user
let userDict = userSnap.value as! [String:AnyObject] //child data
let location = userDict["location"] as! [String:AnyObject]
print("key = \(uid) is at location = \(location)")
}