Created
January 23, 2023 04:03
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| // | |
| // Persistence.swift | |
| // Note Taker | |
| // | |
| // Created by Ari Laverty on 15/1/2023. | |
| // | |
| import CoreData | |
| struct PersistenceController { | |
| static let shared = PersistenceController() | |
| func addNoteEntry() { | |
| let viewContext = container.viewContext | |
| let _ = newNote() | |
| save() | |
| } | |
| func updateNoteEntry(noteEntry: NoteEntry, title: String, content: String) { | |
| let viewContext = container.viewContext | |
| noteEntry.title = title | |
| noteEntry.content = content | |
| noteEntry.updatedAt = Date() | |
| save() | |
| } | |
| func deleteNoteEntry(noteEntry: NoteEntry) { | |
| let viewContext = container.viewContext | |
| viewContext.delete(noteEntry) | |
| save() | |
| } | |
| func newNote() -> NoteEntry { | |
| let viewContext = container.viewContext | |
| let newNoteEntry = NoteEntry(context: viewContext) | |
| newNoteEntry.createdAt = Date() | |
| newNoteEntry.updatedAt = Date() | |
| newNoteEntry.title = "New Note" | |
| newNoteEntry.content = "Keen 2 Peen?" | |
| return newNoteEntry | |
| } | |
| func save() { | |
| let viewContext = container.viewContext | |
| do { | |
| try viewContext.save() | |
| } catch { | |
| let nsError = error as NSError | |
| fatalError("Unresolved error \(nsError), \(nsError.userInfo)") | |
| } | |
| } | |
| static var preview: PersistenceController = { | |
| let result = PersistenceController(inMemory: true) | |
| let viewContext = result.container.viewContext | |
| for _ in 0..<10 { | |
| let newItem = NoteEntry(context: viewContext) | |
| newItem.createdAt = Date() | |
| newItem.updatedAt = Date() | |
| newItem.title = "(title)" | |
| newItem.content = "(content)" | |
| } | |
| do { | |
| try viewContext.save() | |
| } catch { | |
| // Replace this implementation with code to handle the error appropriately. | |
| // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. | |
| let nsError = error as NSError | |
| fatalError("Unresolved error \(nsError), \(nsError.userInfo)") | |
| } | |
| return result | |
| }() | |
| let container: NSPersistentContainer | |
| init(inMemory: Bool = false) { | |
| container = NSPersistentContainer(name: "Note_Taker") | |
| if inMemory { | |
| container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null") | |
| } | |
| container.loadPersistentStores(completionHandler: { (storeDescription, error) in | |
| if let error = error as NSError? { | |
| // Replace this implementation with code to handle the error appropriately. | |
| // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. | |
| /* | |
| Typical reasons for an error here include: | |
| * The parent directory does not exist, cannot be created, or disallows writing. | |
| * The persistent store is not accessible, due to permissions or data protection when the device is locked. | |
| * The device is out of space. | |
| * The store could not be migrated to the current model version. | |
| Check the error message to determine what the actual problem was. | |
| */ | |
| fatalError("Unresolved error \(error), \(error.userInfo)") | |
| } | |
| }) | |
| container.viewContext.automaticallyMergesChangesFromParent = true | |
| } | |
| } |
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