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1import CoreData
2
3struct PersistenceController {
4 static let shared = PersistenceController()
5
6 static var preview: PersistenceController = {
7 let result = PersistenceController(inMemory: true)
8 let viewContext = result.container.viewContext
9 for _ in 0..<10 {
10 let newMap = Map(context: viewContext)
11 newMap.uuid = UUID()
12 newMap.createdAt = Date()
13 newMap.title = "Map \(newMap.createdAt!.format())"
14 newMap.content = ""
15 }
16 do {
17 try viewContext.save()
18 } catch {
19 let nsError = error as NSError
20 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
21 }
22 return result
23 }()
24
25 let container: NSPersistentCloudKitContainer
26
27 init(inMemory: Bool = false) {
28 container = NSPersistentCloudKitContainer(name: "Map")
29
30 container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
31 container.viewContext.automaticallyMergesChangesFromParent = true
32
33 if inMemory {
34 container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
35 }
36 container.loadPersistentStores(completionHandler: { (storeDescription, error) in
37 if let error = error as NSError? {
38 fatalError("Unresolved error \(error), \(error.userInfo)")
39 }
40 })
41 }
42}