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diff --git a/Shared/LocalStorageManager.swift b/Shared/LocalStorageManager.swift
index b938fdf..63bdd88 100644
--- a/Shared/LocalStorageManager.swift
+++ b/Shared/LocalStorageManager.swift
@@ -1,99 +1,123 @@
import CoreData
#if os(iOS)
import UIKit
#elseif os(macOS)
import AppKit
#endif
final class LocalStorageManager {
+
public static var standard = LocalStorageManager()
public let container: NSPersistentContainer
+ private let containerName = "LocalStorageModel"
- private var oldStoreURL: URL {
- let appSupport = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first!
- return appSupport.appendingPathComponent("LocalStorageModel.sqlite")
- }
-
- private var sharedStoreURL: URL {
- let id = "group.com.abunchtell.writefreely"
- let groupContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: id)!
- return groupContainer.appendingPathComponent("LocalStorageModel.sqlite")
- }
-
- init() {
- // Set up the persistent container.
- container = NSPersistentContainer(name: "LocalStorageModel")
- container.loadPersistentStores { description, error in
- if let error = error {
- fatalError("Core Data store failed to load with error: \(error)")
- }
- }
- container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
-
- let center = NotificationCenter.default
-
- #if os(iOS)
- let notification = UIApplication.willResignActiveNotification
- #elseif os(macOS)
- let notification = NSApplication.willResignActiveNotification
- #endif
-
- // We don't need to worry about removing this observer because we're targeting iOS 9+ / macOS 10.11+; the
- // system will clean this up the next time it would be posted to.
- // See: https://developer.apple.com/documentation/foundation/notificationcenter/1413994-removeobserver
- // And: https://developer.apple.com/documentation/foundation/notificationcenter/1407263-removeobserver
- // swiftlint:disable:next discarded_notification_center_observer
- center.addObserver(forName: notification, object: nil, queue: nil, using: self.saveContextOnResignActive)
+ private init() {
+ container = NSPersistentContainer(name: containerName)
+ setupStore(in: container)
+ registerObservers()
}
func saveContext() {
if container.viewContext.hasChanges {
do {
try container.viewContext.save()
} catch {
print("Error saving context: \(error)")
}
}
}
func purgeUserCollections() {
let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "WFACollection")
let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
do {
try container.viewContext.executeAndMergeChanges(using: deleteRequest)
} catch {
print("Error: Failed to purge cached collections.")
}
}
+}
+
+private extension LocalStorageManager {
+
+ var oldStoreURL: URL {
+ let appSupport = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first!
+ return appSupport.appendingPathComponent("LocalStorageModel.sqlite")
+ }
+
+ var sharedStoreURL: URL {
+ let id = "group.com.abunchtell.writefreely"
+ let groupContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: id)!
+ return groupContainer.appendingPathComponent("LocalStorageModel.sqlite")
+ }
+
+ func setupStore(in container: NSPersistentContainer) {
+ if !FileManager.default.fileExists(atPath: oldStoreURL.path) {
+ container.persistentStoreDescriptions.first!.url = sharedStoreURL
+ }
+
+ container.loadPersistentStores { description, error in
+ if let error = error {
+ fatalError("Core Data store failed to load with error: \(error)")
+ }
+ }
+ migrateStore(for: container)
+ container.viewContext.automaticallyMergesChangesFromParent = true
+ container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
+ }
+
func migrateStore(for container: NSPersistentContainer) {
+ // Check if the shared store exists before attempting a migration — for example, in case we've already attempted
+ // and successfully completed a migration, but the deletion of the old store failed for some reason.
+ guard !FileManager.default.fileExists(atPath: sharedStoreURL.path) else { return }
+
let coordinator = container.persistentStoreCoordinator
+ // Get a reference to the old store.
guard let oldStore = coordinator.persistentStore(for: oldStoreURL) else {
return
}
+ // Attempt to migrate the old store over to the shared store URL.
do {
try coordinator.migratePersistentStore(oldStore,
to: sharedStoreURL,
options: nil,
withType: NSSQLiteStoreType)
} catch {
fatalError("Something went wrong migrating the store: \(error)")
}
+ // Attempt to delete the old store.
do {
try FileManager.default.removeItem(at: oldStoreURL)
} catch {
fatalError("Something went wrong while deleting the old store: \(error)")
}
}
-}
-private extension LocalStorageManager {
+ func registerObservers() {
+ let center = NotificationCenter.default
+
+ #if os(iOS)
+ let notification = UIApplication.willResignActiveNotification
+ #elseif os(macOS)
+ let notification = NSApplication.willResignActiveNotification
+ #endif
+
+ // We don't need to worry about removing this observer because we're targeting iOS 9+ / macOS 10.11+; the
+ // system will clean this up the next time it would be posted to.
+ // See: https://developer.apple.com/documentation/foundation/notificationcenter/1413994-removeobserver
+ // And: https://developer.apple.com/documentation/foundation/notificationcenter/1407263-removeobserver
+ // swiftlint:disable:next discarded_notification_center_observer
+ center.addObserver(forName: notification, object: nil, queue: nil, using: self.saveContextOnResignActive)
+ }
+
func saveContextOnResignActive(_ notification: Notification) {
saveContext()
}
+
}

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