how to determine the specific 409 error from an AFError? - ios

Question

I have a method that returns a Single<(HTTPURLResponse, Any)> doing a call to a webservice.
This call returns an 409 for multiple reasons and this reason is passed as a JSON in the response.
I know the JSON is in the data attribute of the DataResponse object but I would like to have it in the AFError that I pass when an error occurs. I want to display the specific 409 error message related to the JSON response to the user to allow him understand what happened.
How could I do that ?
I searched for that in Stackoverflow and also on the github of Alamofire but couldn't find any help to my case.
return Single<(HTTPURLResponse, Any)>.create(subscribe: { single in
let request = self.sessionManager.request(completeURL, method: httpMethod, parameters: params, encoding: encoding, headers: headers)
request.validate().responseJSON(completionHandler: { (response) in
let result = response.result
switch result {
case let .success(value): single(.success((response.response!, value)))
case let .failure(error): single(.error(error))
}
})
return Disposables.create { request.cancel() }
})
I'm working with Alamofire 4.9.1

Answer 1

request.validate().responseJSON { (response) in
let statusCode = response.response?.statusCode ?? 0
guard statusCode != 409 else {
if let data = response.data, let errorJson = try? JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
let errorMessage = errorJson["message"] as? String
let customError = CustomError(message: errorMessage)
single(.error(customError))
}
return
}
let result = response.result
switch result {
case let .success(value): single(.success((response.response!, value)))
case let .failure(error): single(.error(error))
}
}
I guess you can achieve your requirement by this way. create a custom Error class to pass the error to completion. dont forget to call completion if errorJson is not serialised.
class CustomError: Error {
var localizedDescription: String { message ?? "" }
var message: String?
init(message: String?) {
self.message = message
}
}