API working in Postman but giving error in Code - swift

Question

I am trying to call API in postman and its working fine, But If I am trying to call API in swift Alamofire, Its give me error-
My Code is-
func sendToServer(){
let urlString = "https://xxxxxxxxxx/TempService/SaveBarCodes"
let data: Parameters = ["SerialNo": "T8180399","Status":101]
Alamofire.request(urlString, method: .post, parameters: data,encoding: JSONEncoding.default, headers: nil).responseJSON {
response in
switch response.result {
case .success:
print(response)
break
case .failure(let error):
print(error)
}
}
}
Error is-
The JSON value could not be converted to System.Collections.Generic.List`1[BreakBulkModels.Model.WebapiModels.DtoInventoryApi]. Path: $ | LineNumber: 0 | BytePositionInLine: 1.

Answer 1

Your API accepts as parameters an array of JSON objects but you are currently sending a JSON object:
{
"SerialNo": "T8180399",
"Status": 101
}
Because Parameters is a typealias to Dictionary<String, Any> (what you need is Array<Dictionary<String, Any>>) you have to do your parameter encoding yourself and then call request(_:) function of Alamofire passing your URLRequest:
do {
let urlString = "https://xxxxxxxxxx/TempService/SaveBarCodes"
let url = try urlString.asURL()
var request = URLRequest(url: url)
let data = [["SerialNo": "T8180399", "Status": 101]]
request = try JSONEncoding.default.encode(request, withJSONObject: data)
Alamofire.request(request).responseJSON { response in
switch response.result {
case .success:
print(response)
break
case .failure(let error):
print(error)
}
}
} catch {
print(error)
}
Edit: With Alamofire v5 there is a more elegant way by using Encodable protocol:
struct BarCode: Encodable {
var SerialNo: String
var Status: Int
}
func sendToServer(){
let urlString = "https://xxxxxxxxxx/TempService/SaveBarCodes"
let data = [BarCode(SerialNo: "T8180399", Status: 101)]
AF.request(
urlString,
method: .post,
parameters: data,
encoder: JSONParameterEncoder.default
).responseJSON { response in
switch response.result {
case .success:
print(response)
break
case .failure(let error):
print(error)
}
}
}