81 lines
2.6 KiB
Swift
81 lines
2.6 KiB
Swift
//
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// PersistenceController.swift
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// Ferrite
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//
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// Created by Brian Dashore on 7/24/22.
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//
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import CoreData
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// No iCloud until finalized sources
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struct PersistenceController {
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static var shared = PersistenceController()
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// Coredata storage
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let container: NSPersistentContainer
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// Background context for writes
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let backgroundContext: NSManagedObjectContext
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// Coredata load
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init(inMemory: Bool = false) {
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container = NSPersistentContainer(name: "FerriteDB")
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if inMemory {
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container.persistentStoreDescriptions.first?.url = URL(fileURLWithPath: "/dev/null")
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}
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guard let description = container.persistentStoreDescriptions.first else {
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fatalError("CoreData: Failed to find a persistent store description")
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}
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description.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
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description.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)
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container.loadPersistentStores { _, error in
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if let error = error {
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fatalError("CoreData init error: \(error)")
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}
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}
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container.viewContext.automaticallyMergesChangesFromParent = true
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container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
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try? container.viewContext.setQueryGenerationFrom(.current)
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backgroundContext = container.newBackgroundContext()
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backgroundContext.automaticallyMergesChangesFromParent = true
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backgroundContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
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try? backgroundContext.setQueryGenerationFrom(.current)
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}
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func save(_ context: NSManagedObjectContext? = nil) {
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let context = context ?? container.viewContext
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if context.hasChanges {
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do {
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try context.save()
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} catch {
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debugPrint("Error in CoreData saving! \(error.localizedDescription)")
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}
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}
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}
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// By default, delete objects using the ViewContext unless specified
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func delete(_ object: NSManagedObject, context: NSManagedObjectContext? = nil) {
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let context = context ?? container.viewContext
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if context != container.viewContext {
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let wrappedObject = try? context.existingObject(with: object.objectID)
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if let backgroundObject = wrappedObject {
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context.delete(backgroundObject)
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save(context)
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return
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}
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}
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container.viewContext.delete(object)
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save()
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}
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}
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