PizzaJsonToViewModel.swift

let realm = try! Realm()
let json = JSON(self.data)["pizza"].array
let viewModels = json.map { item -> PizzaViewModel in
    let model = Pizza()
    model.id = item["id"].intValue
    model.name = item["name"].stringValue
    model.price = item["price"].intValue
                           
    try! realm.write {
        realm.add(model, update: true)
    }
                           
    return PizzaViewModel(model: model)
}