74 lines
3.1 KiB
Swift
74 lines
3.1 KiB
Swift
//
|
|
// https://mczachurski.dev
|
|
// Copyright © 2022 Marcin Czachurski and the repository contributors.
|
|
// Licensed under the MIT License.
|
|
//
|
|
|
|
|
|
import CoreData
|
|
|
|
public class CoreDataHandler {
|
|
public static let shared = CoreDataHandler()
|
|
public let container: NSPersistentContainer
|
|
|
|
init(inMemory: Bool = false) {
|
|
container = NSPersistentContainer(name: "Vernissage")
|
|
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
|
|
}
|
|
|
|
public func save() {
|
|
let context = self.container.viewContext
|
|
if context.hasChanges {
|
|
do {
|
|
try context.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)")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
extension CoreDataHandler {
|
|
public static var preview: CoreDataHandler = {
|
|
let result = CoreDataHandler(inMemory: true)
|
|
let viewContext = result.container.viewContext
|
|
for _ in 0..<10 {
|
|
let newItem = AccountData(context: viewContext)
|
|
newItem.id = "123"
|
|
}
|
|
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
|
|
}()
|
|
}
|