For-in loop requires '[UserVehicles]?' to conform to 'Sequence'; did you mean to unwrap optional? Swift

Question

I have a data model which I made for API returns, it is something like this:

struct VehicleData: Codable {
    
    let _embedded: Embedded
    
 }

struct Embedded: Codable {
    let userVehicles: [UserVehicles]
}


struct UserVehicles: Codable {
    let id: String
    let images: [String]
    let userId: String
    let vehicle: Vehicle
    let originalPrice: OriginalPrice
    let hasBasicInsurance: Bool

}

I have used callback function to pass it to my ViewController, now I want to get check in the useVehiclers list, how many vehicles hasBasicInsurance. basically, vehicleList?._embedded.userVehicles[i] = true

this is my function code to use the vehicle data in ViewController:

    var vehicleManager = VehicleManager()
    var vehicleList: VehicleData?
    var i: Int = 0
    
    @IBOutlet weak var tableView: UITableView!
       
    override func viewDidLoad() {
        super.viewDidLoad()
        
        vehicleManager.retrieveUserVehicle()
        vehicleManager.onDataUpdate = { [weak self] (data: VehicleData) in
            self?.useData(data: data)
        }
        
        tableView.dataSource = self
        tableView.delegate = self
        tableView.tableFooterView = UIView() //remove empty tableView cells
        tableView.register(UINib(nibName: Constants.vehicleListCellNibName, bundle: nil), forCellReuseIdentifier: Constants.vehicleListToBeInsuredIdentifier)
        
    }
    
    func useData(data: VehicleData) {
        vehicleList = data
        
// code below has issues.... 
for i in [vehicleList?._embedded.userVehicles] {
            
            if let vechile = vehicleList?._embedded.userVehicles[i].hasBasicInsurance {
                if vehicle == true {
                    i = i + 1
                    print(">>number of of insured vehidle: \(i)")
                } else {
                    print(">>>number of of insured vehidle: \(i)")
                }
            }
            
            
            
        }
        
    }

Do you know how to fix it?

Answer 1

You need to supply a default value for optional as a good practise instead of force unwrap

for i in vehicleList?._embedded.userVehicles ?? [] { }