Retrieve firebase data from swift - swift

Question

I'm trying to retrieve data from a Firebase RealTime database, in order to put it on a list which will be used to display data on a TableView.
My problem is that even if I get some data, I haven't enough knowledge to access on arrays and other swift objects. Perhaps, I'm not using the good way to do what I want.
Here is an example of a row on Firebase :
Here is a function written in Swift in which I'm trying to build a list for each row object.
func displayStationsUsingSearch(){
let station = self.stationName
let CP = Int(self.searchedCP!)
// create searchRef or queryRef you name it
let stationsRef = Database.database().reference().child("Stations")
stationsRef.observeSingleEvent(of: .value, with: { (snapshot) in
print(snapshot)
/*if snapshot.value is NSNull {
print("not found")
} else {
// yes we got the user
let id = snapshot.value as! Int
}*/
for child in snapshot.children {
stationsRef.queryOrdered(byChild: "marque")
.queryEqual(toValue: "TOTAL ACCESS")
.observe(.value, with: { snap in
if let dict = snap.value as? [String: AnyObject] {
/*self.stationItem!.nomStation = dict["nomStation"] as! String
self.stationItem!.adresse = dict["adresse"] as! String
self.stationItem!.codePostal = dict["codePostal"] as! String
self.stationItem!.ville = dict["ville"] as! String
self.stationItem!.marque = dict["marque"] as! String
self.stationItem!.pays = dict["pays"] as! String
self.stationItem!.commentaire = dict["commentaire"] as! String
self.stationItem!.coordGPS = dict["coordGPS"] as! String*/
print(dict["nomStation"] as! String)
}
})
}
})
}
The lldb on Xcode workspace displays that :
Printing description of child:
Snap (-LdA6X8CfNY3bsPni31U) {
"DIESEL EXCELLIUM" = 0;
"DIESEL ULTIMATE" = 0;
GAZOLE = 0;
GPL = 0;
SP95 = 0;
"SP95 E10" = 0;
SP98 = 0;
SUPER = 0;
adresse = "RN1 Direction Moisselles";
codePostal = 95570;
commentaire = "";
coordGPS = "";
createdAt = "31/07/2018";
heureDebut = "";
heureFin = "";
id = 0;
marque = ESSO;
modifiedAt = "23/04/2019 18:53";
nomStation = "ESSO Moisselles";
pays = "";
saufJour = "";
services = "";
typeRoute = "";
ville = Moisselles;
}
(lldb)
Could you please help me to retrieve data on a list that I could append to display data on tableview ? Thank you.

Answer 1

Try something like that:
Database.database().reference()
.child("Stations").
observeSingleEvent(of: .value, with: { (snapshot) in
guard let value = snapshot.value as? [String: Any] else {
return
}
var stations = [Station]()
for (key, value) in values {
guard let station = value as? [String: Any],
let adresse = station["adresse"] as? String,
let codePostat = station["codePostat"] as? String else {
continue
}
stations.append(Station(adresse: adresse, codePostat: codePostat))
}
// if you have some completion return retrieved array of stations
completion(stations)
})
struct Station {
private let adresse: String
private let codePostat: String
init(adresse: String, codePostat: String) {
self.adresse = adresse
self.codePostat = codePostat
}
}

Answer 2

You can use a swift Class Instead.
Swift Object:
import Foundation
class FirebaseTransactionData : NSObject{
var customer : FirebaseTransactionDataCustomer!
var driver : FirebaseTransactionDataCustomer!
var status : String!
init(fromDictionary dictionary: [String:Any]){
status = dictionary["status"] as? String
if let customerData = dictionary["customer"] as? [String:Any]{
customer = FirebaseTransactionDataCustomer(fromDictionary: customerData)
}
if let driverData = dictionary["driver"] as? [String:Any]{
driver = FirebaseTransactionDataCustomer(fromDictionary: driverData)
}
}
}
class FirebaseTransactionDataCustomer : NSObject{
var lat : Double!
var longField : Double!
init(fromDictionary dictionary: [String:Any]){
lat = dictionary["lat"] as? Double
longField = dictionary["lng"] as? Double
}
}
Firebase Method
ref.observe(DataEventType.value, with: { (snapshot) in
let value = snapshot.value as? [String:Any]
let datt = FirebaseTransactionData(fromDictionary: value!)
print("snapshot \(datt.status!)")
print("snapshot \(datt.customer.lat!)")
})