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73 lines
2.6 KiB
Swift
73 lines
2.6 KiB
Swift
//
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// Persistence.swift
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// CoreDataSample
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//
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// Created by Garth Vander Houwen on 11/28/21.
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//
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import CoreData
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class PersistenceController {
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static let shared = PersistenceController()
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static var preview: PersistenceController = {
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let result = PersistenceController(inMemory: false)
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let viewContext = result.container.viewContext
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for _ in 0..<10 {
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let newItem = NodeInfoEntity(context: viewContext)
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newItem.lastHeard = Date()
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}
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do {
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try viewContext.save()
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} catch {
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// Replace this implementation with code to handle the error appropriately.
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// 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.
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let nsError = error as NSError
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fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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}
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return result
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}()
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let container: NSPersistentContainer
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init(inMemory: Bool = false) {
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container = NSPersistentContainer(name: "Meshtastic")
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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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container.loadPersistentStores(completionHandler: { (_, error) in
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// Merge policy that favors in memory data over data in the db
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self.container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
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if let error = error as NSError? {
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// Replace this implementation with code to handle the error appropriately.
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// 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.
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/*
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Typical reasons for an error here include:
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* The parent directory does not exist, cannot be created, or disallows writing.
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* The persistent store is not accessible, due to permissions or data protection when the device is locked.
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* The device is out of space.
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* The store could not be migrated to the current model version.
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Check the error message to determine what the actual problem was.
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*/
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let firstStoreURL = self.container.persistentStoreCoordinator.persistentStores.first?.url
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do {
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try self.container.persistentStoreCoordinator.destroyPersistentStore(at: firstStoreURL!, type: .sqlite, options: nil)
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print("💥 Something went terribly wrong, CoreData database truncated. All app data is lost.")
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} catch {
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print("💣 Failed to destroy broken CoreData database, delete the app.")
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}
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print("💣💥 Unresolved error \(error), \(error.userInfo)")
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}
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})
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}
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}
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