CoreDataStack.swift

import Foundation
import CoreData

class CoreDataStack {
    let modelName = "Data Model Name"
    
    private lazy var applicationDocumentsDirectory: NSURL = {
        let urls = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
        
        return urls[urls.count-1]
    }()
    
    // Managed Object Context 
    lazy var context: NSManagedObjectContext = {
        var managedObjectContext = NSManagedObjectContext(concurrencyType: .MainQueueConcurrencyType)
        
        managedObjectContext.persistentStoreCoordinator = self.psc
        
        return managedObjectContext
    }()
    
    // Persistent Store Coor
    private lazy var psc: NSPersistentStoreCoordinator = {
        
        let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
        
        let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent(self.modelName)
        
        do {
            let options = [NSMigratePersistentStoresAutomaticallyOption: true]
            
            try coordinator.addPersistentStoreWithType( NSSQLiteStoreType, configuration: nil, URL: url, options: options)
        } catch {
            print("Error adding persistent store.")
        }
        
        return coordinator
    }()
    
    // Managed Object Model
    private lazy var managedObjectModel: NSManagedObjectModel = {
        
        let modelURL = NSBundle.mainBundle().URLForResource(self.modelName, withExtension: "momd")!
        
        return NSManagedObjectModel(contentsOfURL: modelURL)!
    }()
    
    // Save 
    func saveContext() {
        if context.hasChanges {
            do {
                try context.save()
            } catch let error as NSError {
                print("Error: \(error.localizedDescription)")
                abort()
            }
        }
    }
}