Encodable JSON dictionary in Swift 4 - json

Question

With the help of #matt. I was able to solve it and the finished code is below for anyone who will encounter similer issues in the near future.
Given the below JSON
{
"restaurants": [
{
"id": 1,
"restaurantName": "Chuks",
"restaurantPicture": "restaurantImages/benards.jpg",
"status": "Working",
"workingDays": "Tuesday to Sunday",
"workingHours": "3pm to 10pm"
},
{
"id": 3,
"restaurantName": "Chuks",
"restaurantPicture": "restaurantImages/benards.jpg",
"status": "Working",
"workingDays": "Tuesday to Sunday",
"workingHours": "3pm to 10pm"
},
{
"id": 4,
"restaurantName": "Chuks",
"restaurantPicture": "restaurantImages/benards.jpg",
"status": "Working",
"workingDays": "Tuesday to Sunday",
"workingHours": "3pm to 10pm"
},
{
"id": 5,
"restaurantName": "Chuks",
"restaurantPicture": "restaurantImages/benards.jpg",
"status": "Working",
"workingDays": "Tuesday to Sunday",
"workingHours": "3pm to 10pm"
},
{
"id": 6,
"restaurantName": "Chuks",
"restaurantPicture": "restaurantImages/benards.jpg",
"status": "Working",
"workingDays": "Tuesday to Sunday",
"workingHours": "3pm to 10pm"
}
]
}
And I am trying to access the arrays within the Dictionary with this code into a table. So I have made a Struct. Below is the content of my Structfile.
struct Response: Codable {
let restaurants: [Restaurant]
struct Restaurant: Codable {
let id: Int
let restaurantName: String
let restaurantPicture: String
let status: String
let workingDays: String
let workingHours: String
}
}
This is my main View Controller
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tabelView: UITableView!
var restaurants = [Response]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
downloadJSON {
self.tabelView.reloadData()
}
tabelView.delegate = self
tabelView.dataSource = self
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return restaurants.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell(style: .default, reuseIdentifier: nil)
cell.textLabel?.text = restaurants[indexPath.row].restaurantName.capitalized
return cell
}
func downloadJSON(completed: #escaping ()->()){
let url = URL(string: "http://localhost:8888/tableview/tableView.php")
URLSession.shared.dataTask(with: url!) { (data, response, error) in
if error == nil{
do{
let downloadedRestaurants = try JSONDecoder().decode(Response.self, from: data!)
print(downloadedRestaurants.restaurants.map{$0.restaurantName})
self.restaurant.append(downloadedRestaurants)
DispatchQueue.main.async {
completed()
}
}catch{
print(error)
}
}
}.resume()
}
}
Thanks #matt. I hope this piece becomes useful to other newbies or anyone who is having similar issues
Cheers!

Answer 1

The problem is that you are trying to decode as [RestaurantStats]. But look at your JSON! It is not an array of RestaurantStats. It is not an array at all. It is a dictionary with a single key, "restaurants". You need to create that struct and decode as that.
EDIT Since I gave my answer, you have revised your code to declare an outer struct Response. And that's correct — and is exactly what I said you should do. So decode as Response and you're all set.