URLSession وCodable وعقود الردود

import Foundation
struct WorkshopDTO: Decodable {
    let id: String
    let seats: Int
}
enum DecodeFailure: Error { case invalidWorkshop }
func decodeWorkshop(_ data: Data) throws -> WorkshopDTO {
    let item = try JSONDecoder().decode(WorkshopDTO.self, from: data)
    guard !item.id.isEmpty, item.seats >= 0 else { throw DecodeFailure.invalidWorkshop }
    return item
}
let fixture = Data(#"{"id":"w-7","seats":3}"#.utf8)
// try decodeWorkshop(fixture).seats -> 3

The accepted fixture has identifier w-7 and seats 3.

يفك المثال بايتات محلية فقط، ولا يرسل طلبا أو يفرض السعة المعتمدة.

enum LoadFailure: Error { case unexpectedResponse }
func loadWorkshop(from url: URL, session: URLSession) async throws -> WorkshopDTO {
    let (data, response) = try await session.data(from: url)
    guard let http = response as? HTTPURLResponse, http.statusCode == 200 else {
        throw LoadFailure.unexpectedResponse
    }
    return try decodeWorkshop(data)
}

Only an HTTP 200 response with a valid workshop body becomes a model.

يتطلب Foundation والمفكك السابق. هذا مقتطف شبكة غير منفذ ولا وجهة مضبوطة له.