If you have a problematic JSON, which can contain number or string for some keys, you can decode object without that property and manually set that property after decoding.
For example, I have a Vehicle class inside HistoryItem. In Vehicle model_year can be empty String or non empty Int. Here I am decoding modelYear manually using NSDictionary and trying to get Int. Swift 4 cannot do it automatically.
do {
// Decoding HistoryItem from JSON
let jsonData = try JSONSerialization.data(withJSONObject: dict, options: .prettyPrinted)
let decoder = JSONDecoder()
let historyItem = try decoder.decode(HistoryItem.self, from: jsonData)
if let modelYear = (dict as NSDictionary).value(forKeyPath: "vehicle.model_year") as? Int {
historyItem.vehicle?.modelYear = modelYear
}
// Saving HistoryItem to Realm
let realm = try! Realm()
try! realm.write {
realm.add(historyItem, update: true)
}
} catch {
print(error.localizedDescription)
}
This is my Vehicle class that is contained inside HistoryItem:
class Vehicle: Object, Codable {
@objc dynamic var VIN: String = ""
@objc dynamic var make: String?
@objc dynamic var modelName: String?
@objc dynamic var recallCount: Int = 0
@objc dynamic var modelYear: Int = 0
override static func primaryKey() -> String? {
return "VIN"
}
private enum CodingKeys: String, CodingKey {
case VIN = "vin"
case make
case modelName = "model_name"
case recallCount = "recall_count"
}
}
As you see, there is no model_year key in CodingKeys.