Convert ID to Username using JSON - json

Question

I have two JSON call functions that get clients data and invoice data. In my clients JSON response I have ID and name, etc. In my invoice response I have client ID.
I need to get the client ID from invoice and convert to the client name string.
In my ClientsViewController I've made a function called downloadClientsJSON
func downloadClientsJSON(completed: #escaping () -> ()) {
let url = URL(string: "http://ex.com/app/api/clientList/get")
URLSession.shared.dataTask(with: url!) { (data, response, error) in
if error == nil {
do {
self.clients.removeAll()
self.clients = try JSONDecoder().decode([ClientsList].self, from: data!)
DispatchQueue.main.async {
completed()
}
} catch {
print ("Error")
}
}
}.resume()
}
And here is the ClientsList structure:
import Foundation
struct ClientsList:Decodable {
let name: String
let vatNumber: String
let address: String
let cap: String
let city: String
let prov: String
let tel: String
let email: String
}
Here is the JSON Response:
[{"id":1,"name":"DemoClient","vatNumber":"010101010101","address":"Demo Address, 1","cap":"01010","city":"DemoCity","prov":"DP","tel":"555-1112223","email":"demo#example.com"}]
In my InvoiceViewController I've made a function called downloadInvoicesJSON
func downloadJSON(completed: #escaping () -> ()) {
let url = URL(string: "http://ex.com/app/api/invoiceList/get")
URLSession.shared.dataTask(with: url!) { (data, response, error) in
if error == nil {
do {
self.invoices.removeAll()
self.invoices = try JSONDecoder().decode([InvoiceList].self, from: data!)
DispatchQueue.main.async {
completed()
}
} catch {
print (error)
}
}
}.resume()
}
Here is the InvoiceList structure:
import Foundation
struct InvoiceList:Decodable {
let id: NSInteger
let date: String
let expiration: String
let client: NSInteger
let status: NSInteger
let lines: String
let total: Float
}
Here is the JSON Response:
[{"id":1,"date":"01-01-2018","expiration":"01-01-2018","client":3,"status":3,"lines":"1:1","total":700},{"id":2,"date":"30-01-2018","expiration":"30-01-2018","client":4,"status":2,"lines":"1:1","total":100},{"id":3,"date":"15-02-2018","expiration":"15-02-2018","client":3,"status":3,"lines":"1:1","total":700}]
The function should be in the InvoiceViewController. How do I get the result?

Answer 1

JSON object you are getting from http://ex.com/app/api/clientList/get should be an array and parameter keys should be same as property name of ClientsList.
struct ClientsList: Decodable {
let name: String
let vatNumber: String
let address: String
let cap: String
let city: String
let prov: String
let tel: String
let email: String
}
If you are not sure that you will receive all properties in the response JSON, then make that particular property optional. like:
struct ClientsList: Decodable {
let name: String
let vatNumber: String
let address: String
let cap: String
let city: String? // Not sure about receiving this property
let prov: String? // Not sure about receiving this property
let tel: String? // Not sure about receiving this property
let email: String
}
Same pattern you need to follow for http://ex.com/app/api/invoiceList/get and InvoiceList.