Alamofire error to decode JSON response with Struct - json

Question

I have a problem with my alamofire.request. The response is nil but I don't understand why.
My problem are: I use API of OpenFoodFacts, it works with a web address of this style: https://fr.openfoodfacts.org/api/v0/produit/3366321054229
I use Alamofire to get the request with a protocol, a session and a service.
My Protocol:
protocol CheckerFridgeProtocol {
func request(url: URL, parameters: Parameters, callback: #escaping (DataResponse<Any>) -> Void )
}
My Session:
class CheckerFridgeSession: CheckerFridgeProtocol {
func request(url: URL, parameters: Parameters, callback: #escaping (DataResponse<Any>) -> Void) {
Alamofire.request(url, method: .get, parameters: parameters).responseJSON { responseData in
callback(responseData)
}
}
}
My service:
class CheckerFridgeService {
private var checkerFridgeSession: CheckerFridgeSession
init(checkerFridgeSession: CheckerFridgeSession = CheckerFridgeSession()) {
self.checkerFridgeSession = checkerFridgeSession
}
// get recipe ingredients
func getRequest(barCode: String, callback: #escaping (Bool, CheckerFridgeData?) -> Void) {
let parameters: Parameters = [:]
let url = URL(string: "https://fr.openfoodfacts.org/api/v0/produit/\(barCode)")!
checkerFridgeSession.request(url: url, parameters: parameters) { (response) in
DispatchQueue.main.async {
guard response.response?.statusCode == 200 else {
print("Response 400 Error")
callback(false, nil)
return
}
guard let data = response.data else {
print("Data error")
callback(false, nil)
return
}
guard let responseJSON = try? JSONDecoder().decode(CheckerFridgeData.self, from: data) else {
print("Response JSON Failed")
callback(false, nil)
return
}
guard responseJSON.status > 0 else {
print("Status Code 0")
callback(false, nil)
return
}
// print(response.result.value as Any)
callback(true, responseJSON)
}
}
}
}
I have a file CheckerFridgeData contain Struct to decode the responseJSON:
// MARK: - CheckerFridge
struct CheckerFridgeData: Codable {
let status: Int
let product: Product?
}
// MARK: - Product
struct Product: Codable {
let additivesTags: [String]?
let productNameFr: String?
let imageSmallURL, imageFrontSmallURL: String?
}
When I use my request to my code, I have no error but my responseJSON return nil
CheckerFridgeData(status: 1, product: Optional(Checker_Fridge.Product(additivesTags: nil, productNameFr: nil, imageSmallURL: nil, imageFrontSmallURL: nil)))
But if I print response.result.value as Any the code returns the JSON Value.
Have you any idea why I can't decode my struct with my JSON data ?
Thanks a lot for your help

Answer 1

I think the problem is about custom types. If you'd like to convert custom types you need to use CodingKeys protocol. When I looked your json there is no property like additivesTags there is additives_tags so you should use CodingKeys like following.
struct Product: Codable {
let additivesTags: [String]?
let productNameFr: String?
let imageSmallURL, imageFrontSmallURL: String?
enum CodingKeys: String, CodingKey {
case additivesTags = "additive_tags"
case productNameFr = "product_name_fr"
case imageSmallURL
}
}