git.r.bdr.sh - rbdr/map/blob - Map/Persistence.swift

   1 //
   2 //  Persistence.swift
   3 //  Map
   4 //
   5 //  Created by Ruben Beltran del Rio on 2/1/21.
   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         for _ in 0..<10 {
  17             let newMap = Map(context: viewContext)
  18             newMap.uuid = UUID()
  19             newMap.createdAt = Date()
  20             newMap.title = "Map \(newMap.createdAt!.format())"
  21             newMap.content = ""
  22         }
  23         do {
  24             try viewContext.save()
  25         } catch {
  26             // Replace this implementation with code to handle the error appropriately.
  27             // 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.
  28             let nsError = error as NSError
  29             fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
  30         }
  31         return result
  32     }()
  33
  34     let container: NSPersistentCloudKitContainer
  35
  36     init(inMemory: Bool = false) {
  37         container = NSPersistentCloudKitContainer(name: "Map")
  38         if inMemory {
  39             container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
  40         }
  41         container.loadPersistentStores(completionHandler: { (storeDescription, error) in
  42             if let error = error as NSError? {
  43                 // Replace this implementation with code to handle the error appropriately.
  44                 // 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.
  45
  46                 /*
  47                 Typical reasons for an error here include:
  48                 * The parent directory does not exist, cannot be created, or disallows writing.
  49                 * The persistent store is not accessible, due to permissions or data protection when the device is locked.
  50                 * The device is out of space.
  51                 * The store could not be migrated to the current model version.
  52                 Check the error message to determine what the actual problem was.
  53                 */
  54                 fatalError("Unresolved error \(error), \(error.userInfo)")
  55             }
  56         })
  57     }
  58 }