How to store model data in Userdefaults swift?

Question

My model class:

struct AllRestroVendor:Codable{
let vendorID, name: String?
let rating: Rating?
let option: [Options]?

enum CodingKeys: String, CodingKey {
    case vendorID = "vendor_id"
    case name
    case rating
    case options
}}

struct Rating: Codable {
let count, rating, image, name: String?
}

struct Options: Codable{
let name, price: String?
}

I am trying to store this model data in userdefaults.

func setWishList(details :AllRestroVendor) {

    let encoder = JSONEncoder()
    if let encoded = try? encoder.encode(details) {
        let defaults = UserDefaults.standard
        defaults.set(encoded, forKey: UD_WISHLIST)
    }
    userdefaultsSynchronize()
}

func getWishList() -> AllRestroVendor {

    let defaults = UserDefaults.standard

    if let topicsList = defaults.object(forKey: "topic_list") as? Data {
        let decoder = JSONDecoder()
        if let loadedList = try? decoder.decode(AllRestroVendor.self, from: topicsList) {
            return loadedList
        }
    }

    let aData = AllRestroVendor(vendorID: "", name: "", rating: Rating?, options: [])
    return aData
}

Here getting an error "Cannot convert value of type 'Rating?.Type' to expected argument type 'Rating?'"

I gothrough every anyswers. But unfortunately cannot resolve this issue. Help me to solve this.