Use user location as a determinant in displaying content - firebase

Question

I ask for user location and then extract their location so I can display it. This is how I extract their location:
func extractLocation(){
CLGeocoder().reverseGeocodeLocation(self.userLocation) { (res, err) in
guard let safeData = res else {return}
var address = ""
// address += safeData.first?.name ?? ""
// address += ", "
address += safeData.first?.locality ?? ""
self.userAddress = address
// print(address)
}
}
To display it, I just use #StateObject to refer to the class and then Text(LocationModel.userAddress)
In the app Im currently working, I want to display different content according to the location the users at. Information is stored in Cloud Firestore. As an example, lets have collection "FRIENDS". There, I have 3 auto ID:
name: Peter, location: New York
name: John, location: Los Angeles
name: James, location: Miami
So, if I'm in New York, only Peter's name will be displayed, if I'm in Los Angeles, only John's name will be displayed, and so on.
I thought that using
db.collection("FRIENDS").whereField("location", isEqualTo: LocationModel.userAddress).getDocuments ...
would work, but the app crashed. How would I solve this problem?
EDIT:
this the exact code im using:
struct Test: Identifiable{
var id: String = UUID().uuidString
var name: String
}
class UseLocationViewModel: NSObject,ObservableObject{
#StateObject var LocationModel = LocationViewModel()
let db = Firestore.firestore()
#Published var test = [Test]()
func useLocation(){
db.collection("FRIENDS").whereField("location", isEqualTo: LocationModel.userAddress).getDocuments { (querySnapshot, err) in
guard let documents = querySnapshot?.documents else {return }
self.test = documents.map { (queryDocumentSnapshot) -> Test in
let data = queryDocumentSnapshot.data()
let name = data["Name"] as? String ?? ""
return Test(name: name)
}
}
}
}
struct AnyView: View{
#StateObject var useLocationModel = UseLocationViewModel()
var body: some View{
VStack{
ForEach(useLocationModel.test){ info in
Text(info.name).foregroundColor(Color.white)
}
}.onAppear(){
useLocationModel.useLocation()
}
}
}
EDIT 2: if I use .whereField(LocationModel.userAddress, isEqualTo: "location" ) I get the following errors after launching:
RED ERROR Thread 1: "Invalid field path (). Paths must not be empty, begin with
'.', end with '.', or contain '..'"
PURPLE ERROR Accessing StateObject's object without being installed
on a View. This will create a new instance each time.
If I use it as in edit 1 (.whereField("location", isEqualTo: LocationModel.userAddress)) I only get purple error