How can I convert Json into 2D array? - arrays

Question

If I got a Json like this:
{ "i": [ "0", [123]] }
Is there any possible way can decode the 2D array above?
class ModelA: Codable{
var i: [String]?
var temp: [Any] = []
enum CodingKeys: String, CodingKey {
case i = "i"
}
required init(from decoder: Decoder) throws {
let value = try decoder.container(keyedBy: CodingKeys.self)
temp = try value.decode([Any].self, forKey: .i)
}
}
Usage:
public func printJsonData(){
let jsonData: Data = """
{
"i": [ "0", [123]]
}
""".data(using: .utf8)!
if let model = try? JSONDecoder().decode(ModelA.self, from: jsonData){
print(model.temp)
}else{
print("no data")
}
}
I have tried that an array [Any] works successfully here,
but can't find any method to convert in 2D array.
If someone knows how to solve this problem, or knows this is impossible in Swift4.2, please tell me. Thanks!

Answer 1

If you know the possible data types for the array value, perhaps you can try using the possible value (in this case String and [Int]) represented by enum instead of Any.
e.g:
enum ArrayIntOrString: Decodable {
case string(String)
case arrayOfInt([Int])
init(from decoder: Decoder) throws {
if let string = try? decoder.singleValueContainer().decode(String.self) {
self = .string(string)
return
}
if let arrayOfInt = try? decoder.singleValueContainer().decode([Int].self) {
self = .arrayOfInt(arrayOfInt)
return
}
throw ArrayIntOrStringError.arrayIntOrStringNotFound
}
enum ArrayIntOrStringError: Error {
case arrayIntOrStringNotFound
}
}
And declare it in your model:
class ModelA: Decodable {
var i: [ArrayIntOrString]?
enum CodingKeys: String, CodingKey {
case i = "i"
}
}
usage
public func printJsonData() {
let jsonData: Data = """
{
"i": [ "0", [123]]
}
""".data(using: .utf8)!
do {
let model = try JSONDecoder().decode(ModelA.self, from: jsonData)
print(model.i)
} catch let err {
print("no data \(err)")
}
}