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comparison Simoleon/Helpers/Persistence.swift @ 156:84137052813d

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Refactor code
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Sat, 28 Aug 2021 11:15:25 +0100
parents Simoleon/Persistence.swift@ecc58b9cd89d
children 35628bac01f5
comparison
equal deleted inserted replaced
155:681f2cbe8c7f 156:84137052813d
1 //
2 // Persistence.swift
3 // Simoleon
4 //
5 // Created by Dennis Concepción Martín on 08/07/2021.
6 //
7
8 import CoreData
9
10 struct PersistenceController {
11 static let shared = PersistenceController()
12
13 static var preview: PersistenceController = {
14 let result = PersistenceController(inMemory: true)
15 let viewContext = result.container.viewContext
16
17 for _ in 0..<10 {
18 let favorite = Favorite(context: viewContext)
19 favorite.currencyPair = "GBP/USD"
20 }
21 do {
22 try viewContext.save()
23 } catch {
24 /*
25 Replace this implementation with code to handle the error appropriately.
26 fatalError() causes the application to generate a crash log and terminate.
27 You should not use this function in a shipping application, although it may be useful during development.
28 */
29 let nsError = error as NSError
30 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
31 }
32 return result
33 }()
34
35 let container: NSPersistentCloudKitContainer
36
37 init(inMemory: Bool = false) {
38 container = NSPersistentCloudKitContainer(name: "Simoleon")
39 container.viewContext.automaticallyMergesChangesFromParent = true
40 container.viewContext.mergePolicy = NSMergeByPropertyStoreTrumpMergePolicy
41 if inMemory {
42 container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
43 }
44 container.loadPersistentStores(completionHandler: { (storeDescription, error) in
45 if let error = error as NSError? {
46 /*
47 Replace this implementation with code to handle the error appropriately.
48 fatalError() causes the application to generate a crash log and terminate.
49 You should not use this function in a shipping application, although it may be useful during development.
50 */
51
52 /*
53 Typical reasons for an error here include:
54 * The parent directory does not exist, cannot be created, or disallows writing.
55 * The persistent store is not accessible, due to permissions or data protection when the device is locked.
56 * The device is out of space.
57 * The store could not be migrated to the current model version.
58 Check the error message to determine what the actual problem was.
59 */
60 fatalError("Unresolved error \(error), \(error.userInfo)")
61 }
62 })
63 }
64 }