CoreDataStackTheOldWayPreiOS10.swift

//
//  CoreDataStackTheOldWay.swift
//  CoreDataShowcase
//
//  Created by Barbara Rodeker on 24.09.17.
//
//  THIS CLASS CONTAINS PROPERTIES THAT NEEDED TO BE
//  CREATED FOR CORE DATA BEFORE THE EXISTENCE OF NSPERSISTENTCONTAINER (added in iOS10)
//
// SWIFT 4


import Foundation
import CoreData

class CoreDataStackTheOldWay: NSObject {
    
    private static let modelName = "CoreDataShowcase"
    static var shared = CoreDataStackTheOldWay()
    
    private(set) lazy var model: NSManagedObjectModel = {
        let modelURL = Bundle.main.url(forResource: CoreDataStackTheOldWay.modelName, withExtension: "momd")!
        return NSManagedObjectModel(contentsOf: modelURL)!
    }()
    
    private(set) lazy var coordinator: NSPersistentStoreCoordinator = {
        let coordinator = NSPersistentStoreCoordinator(managedObjectModel: model)
        
        let storeURL = URL(string: "\(CoreDataStackTheOldWay.modelName).sqlite", relativeTo: FileManager.applicationDocumentsDirectory)
        
        do {
            try coordinator.addPersistentStore(ofType: NSSQLiteStoreType,
                                               configurationName: nil,
                                               at: storeURL,
                                               options: [NSMigratePersistentStoresAutomaticallyOption: true,
                                                         NSInferMappingModelAutomaticallyOption: true])
        } catch {
            fatalError("unable to read store ")
        }
        
        return coordinator
    }()
    
    private(set) lazy var context: NSManagedObjectContext = {
        let context = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
        context.persistentStoreCoordinator = coordinator
        return context
    }()
    
    // MARK: -  Saving support
    
    func save() {
        if context.hasChanges {
            do {
                try context.save()
            } catch {
                let nserror = error as NSError
                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
            }
        }
    }
    
    
}