--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/GeoQuiz/Models/Controllers/PersistenceController.swift	Wed Nov 09 10:30:01 2022 +0100
@@ -0,0 +1,70 @@
+//
+//  PersistenceController.swift
+//  GeoQuiz
+//
+//  Created by Dennis Concepción Martín on 19/10/22.
+//
+
+import CoreData
+import SwiftUI
+
+class PersistenceController {
+    static let shared = PersistenceController()
+    
+    let container: NSPersistentCloudKitContainer
+    
+    static var preview: PersistenceController = {
+        let result = PersistenceController(inMemory: true)
+        let viewContext = result.container.viewContext
+        
+        #if DEBUG
+        createMockData(with: viewContext)
+        #endif
+
+        return result
+    }()
+
+    init(inMemory: Bool = false) {
+        container = NSPersistentCloudKitContainer(name: "GeoQuiz")
+        
+        if inMemory {
+            container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
+        }
+        
+        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
+            if let error = error as NSError? {
+                fatalError("Unresolved error \(error), \(error.userInfo)")
+            }
+        })
+        
+        container.viewContext.automaticallyMergesChangesFromParent = true
+    }
+    
+    #if DEBUG
+    static func createMockData(with moc: NSManagedObjectContext) {
+        for _ in 0..<10 {
+            let playedGame = PlayedGame(context: moc)
+            
+            playedGame.type = GameType(rawValue: Int16.random(in: 0...3))!
+            playedGame.score = Int32.random(in: 0...50)
+            
+            let dayComponent = DateComponents(day: Int.random(in: -5...0))
+            playedGame.date = Calendar.current.date(byAdding: dayComponent, to: Date())
+            
+            if playedGame.type == .guessTheFlag || playedGame.type == .guessTheCapital {
+                playedGame.correctAnswers = ["Bangladesh", "Belgium", "Burkina Faso", "Bermuda", "Jamaica"]
+                playedGame.wrongAnswers = ["Belarus", "Russia"]
+            } else {
+                playedGame.correctAnswers = ["Herat", "Lobito", "Darregueira", "San Juan"]
+                playedGame.wrongAnswers = ["San Luis", "Oranjestad"]
+            }
+        }
+        do {
+            try moc.save()
+        } catch {
+            let nsError = error as NSError
+            fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
+        }
+    }
+    #endif
+}