Filter JSON in Swift 4 - json

Question

I want to filter my JSON and I can't find a way.
My JSON :
{
"id": "3",
"nom": "Blancs sablons",
"description": "Plage gigantesque, très souvent des surfeurs à l'eau."
},
{
"id": "4", // id to search
"nom": "Autre nom", // text to print
"description": "Encore une description"
},
{
"id": "5",
"nom": "Nom différent",
"description": "Et la dernière description"
},
I want to be able to print 'Autre nom' by calling
print(Spot[4].description)
Where 4 is the id
So I tried this struct Spot with constructor :
import Foundation
import MapKit
struct Spot : Decodable {
let nom : String
let description : String
let id: String
init(nom: String, description: String, id: String, img1: String, latitude: String, longitude: String) {
self.nom = nom
self.description = description
self.id = id
self.img1 = img1
self.latitude = latitude
self.longitude = longitude
}
}
And this to decode JSON :
func getSpots(){
guard let downloadURL = URL(string: "http://dronespot.fr/getSpot.php") else { return }
URLSession.shared.dataTask(with: downloadURL) { data, urlResponse, error in
guard let data = data, error == nil, urlResponse != nil else {
print("Oops Call for Help")
return
}
do {
let decoder = JSONDecoder()
let rates = try decoder.decode([Spot].self, from: data)
} catch {
print("Error after loading", error)
}
}.resume()
}
Any idea ?

Answer 1

You are getting an array of results back so you just need to select the one that you want out of the array.
In my test code I didn't find one with an id of 4.
You can filter the array using the filter high order function let rate = rates.filter { $0.id == "36" }
Here is the code I used in a Playground to test
//: Playground - noun: a place where people can play
import PlaygroundSupport
import UIKit
struct Spot : Decodable {
let nom : String
let description : String
let id: String
}
func getSpots(){
guard let downloadURL = URL(string: "http://dronespot.fr/getSpot.php") else { return }
URLSession.shared.dataTask(with: downloadURL) { data, urlResponse, error in
guard let data = data, error == nil, urlResponse != nil else {
print("Oops Call for Help")
return
}
do {
let decoder = JSONDecoder()
let rates = try decoder.decode([Spot].self, from: data)
let rate = rates.filter { $0.id == "36" }
print(rate)
} catch {
print("Error after loading", error)
}
}.resume()
}
getSpots()
PlaygroundPage.current.needsIndefiniteExecution = true