Decoding enum in Swift 5 - This CANNOT be this hard

Question

I've been trying for the past 3-4 hours to get this stupid thing to decode this enum correctly and now am incredibly frustrated with this! I have a json string returning from an API that looks like this:

[
  {
    "contractType": 0
  }
]

I am trying to map THAT to an enum called ContractType. This is my whole ContractType enum

enum ContractType: Int {
    case scavenger = 0
}

and this is my extension I tried to make it conform to the Codable protocol.

extension ContractType: Codable {
    enum Key: Int, CodingKey {
        case rawValue
    }

    enum CodingError: Error {
        case unknownValue
    }

    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: Key.self)
        let rawValue = try? container.decode(Int.self, forKey: .rawValue)

        switch rawValue {
        case 0:
            self = .scavenger
        default:
            throw CodingError.unknownValue
        }
    }

    func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: Key.self)
        switch self {
        case .scavenger:
            try container.encode(0, forKey: .rawValue)
        }
    }
}

What the heck am I doing wrong!? Any help would be greatly appreciated!

Answer 1

This all you need here.

struct Contract: Codable {
    var contractType: ContractType

    enum ContractType: Int, Codable {
        case scavenger
    }
}

do {
    let contract = try JSONDecoder().decode([Contract].self, from: json)
    print(contract.contractType)
} catch {
    print(error)
}