How to get Firebase data as a model in swift? - swift

Question

I am trying to get data from firebase and use it as a model that I created.
Here is my model;
class UserData{
var nickname : String = ""
var onesignal_player_id : String = ""
var step_count : Int = 0
var total_point : Int = 0
var competitions : [String:Competition] = [String:Competition]()
}
class Competition{
var end_date : String = ""
var gift : String = ""
var id: String = ""
var name: String = ""
var users : [String:Int] = [:]
}
and this is my function;
func getFirebaseData() {
ref = Database.database().reference()
ref.child("users").child("HXXNCXf6RRS4WVO12shZ3j15BnG3").observe(.value) { (snapshot) in
if let snapshotValue = snapshot.value as? Dictionary<String,Any> {
//change userData with the snapshotValue
self.userData.nickname = snapshotValue["nickname"] as! String
self.userData.step_count = snapshotValue["step_count"] as! Int
self.userData.total_point = snapshotValue["total_point"] as! Int
self.userData.onesignal_player_id = snapshotValue["onesignal_player_id"] as! String
self.userData.competitions = snapshotValue["competitions"] as! [String:Competition]
//reload UI with userData
print(self.userData.competitions)
} else {
print("An error occured while assigning snapshotValue to userData")
}
}
}
This code gave me error like this;
Could not cast value of type '__NSDictionaryM' (0x1f47ada20) to 'StepCounterApp.Competition' (0x1004c06f0).
2021-01-02 23:05:49.985711+0300 StepCounterApp[32511:3685645] Could not cast value of type '__NSDictionaryM' (0x1f47ada20) to 'StepCounterApp.Competition' (0x1004c06f0).
but when i comment out the line included self.userData.competitions from getFirebaseData function, everything works fine.
What should I do? How can I use firebase data as a model?
Finally here is my firebase data;

Answer 1

The problem is in your data model. Declare your model data like this
class UserData {
var nickname : String = ""
var onesignal_player_id : String = ""
var step_count : Int = 0
var total_point : Int = 0
var competitions : Competition = Competition()
}
class Competition{
var end_date : String = ""
var gift : String = ""
var id: String = ""
var name: String = ""
var users : [String:Int] = [:]
init() {
}
init(with dictionary: [String: Any]) {
self.end_date = dictionary["end_date"] as! String
self.gift = dictionary["gift"] as! String
self.id = dictionary["id"] as! String
self.name = dictionary["name"] as! String
self.users = dictionary["users"] as! [String:Int]
}
}
And inside the getFirebaseData funcation
self.userData.competitions = Competition(with: snapshotValue["competitions"] as! [String: Any])

Answer 2

The problem was in my data model and with the help of Raja Kishan's data model sugestion I fixed the problem.
First I changed the model little bit;
class UserData{
var nickname : String = ""
var onesignal_player_id : String = ""
var step_count : Int = 0
var total_point : Int = 0
var competitions : [String:Competition] = [String:Competition]()
}
class Competition{
var end_date : String = ""
var gift : String = ""
var id: Int = 0
var name: String = ""
var users : [String:Int] = [:]
init() {
}
init(with dictionary: [String: Any]) {
self.end_date = dictionary["end_date"] as! String
self.gift = dictionary["gift"] as! String
self.id = dictionary["id"] as! Int
self.name = dictionary["name"] as! String
self.users = dictionary["users"] as! [String:Int]
}
}
Than I add a childSnapshot to my method so I can work directly the "competitions";
func getFirebaseData() {
ref = Database.database().reference()
ref.child("users").child("HXXNCXf6RRS4WVO12shZ3j15BnG3").observe(.value) { [self] (snapshot) in
if let snapshotValue = snapshot.value as? [String:Any] {
//change userData with the snapshotValue
self.userData.nickname = snapshotValue["nickname"] as! String
self.userData.step_count = snapshotValue["step_count"] as! Int
self.userData.total_point = snapshotValue["total_point"] as! Int
self.userData.onesignal_player_id = snapshotValue["onesignal_player_id"] as! String
//******
//This part of the coded added for to solve the problem starting from here
let childSnap = snapshot.childSnapshot(forPath: "competitions")
if let childSnapValue = childSnap.value as? [String:Any] {
childSnapValue.forEach { (element) in
self.userData.competitions.updateValue(Competition(with: element.value as! [String:Any]), forKey: element.key)
}
} else {
print("something wrong with the childSnap")
}
//to here
//******
} else {
print("An error occured while assigning snapshotValue to userData")
}
}
}