How to use Any in Codable Type

Question

I\'m currently working with Codable types in my project and facing an issue.

struct Person: Codable
{
    var id: Any
}

Answer 1

There is a corner case which is not covered by Luca Angeletti's solution.

For instance, if Cordinate's type is Double or [Double], Angeletti's solution will cause an error: "Expected to decode Double but found an array instead"

In this case, you have to use nested enum instead in Cordinate.

enum Cordinate: Decodable {
    case double(Double), array([Cordinate])

    init(from decoder: Decoder) throws {
        if let double = try? decoder.singleValueContainer().decode(Double.self) {
            self = .double(double)
            return
        }

        if let array = try? decoder.singleValueContainer().decode([Cordinate].self) {
            self = .array(array)
            return
        }

        throw CordinateError.missingValue
    }

    enum CordinateError: Error {
        case missingValue
    }
}

struct Geometry : Decodable {
    let date : String?
    let type : String?
    let coordinates : [Cordinate]?

    enum CodingKeys: String, CodingKey {

        case date = "date"
        case type = "type"
        case coordinates = "coordinates"
    }

    init(from decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)
        date = try values.decodeIfPresent(String.self, forKey: .date)
        type = try values.decodeIfPresent(String.self, forKey: .type)
        coordinates = try values.decodeIfPresent([Cordinate].self, forKey: .coordinates)
    }
}