title: watchOS 2 with Core Data
body: <p>With watchOS 1, my understanding is that the watch extension was placed in the iOS app and so you could use a shared Core Data persistent store for both the watch app and the iOS app(Which was done by using an app group, and making a separate framework that handled the data model for both the iOS app and watch app.)</p>
  
  <p>However, with watchOS 2, the watch extension has moved onto the watch itself - so it would have its own persistent store.So,according to me, I can use core data on apple watch directly without using iOS app, But when I creating a project for watchOS 2 , there is no option to use core data in your watch app.If I am adding these functions in ExtensionDelegate:</p>
  
  <pre><code>lazy var applicationDocumentsDirectory: NSURL = {
      // The directory the application uses to store the Core Data store file. This code uses a directory named "finoit.test" in the application's documents Application Support directory.
      let urls = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
      return urls[urls.count-1]
  }()
  
  lazy var managedObjectModel: NSManagedObjectModel = {
      // The managed object model for the application. This property is not optional. It is a fatal error for the application not to be able to find and load its model.
      let modelURL = NSBundle.mainBundle().URLForResource("test", withExtension: "momd")!
      return NSManagedObjectModel(contentsOfURL: modelURL)!
  }()
  
  lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator = {
      // The persistent store coordinator for the application. This implementation creates and returns a coordinator, having added the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail.
      // Create the coordinator and store
      let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
      let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("SingleViewCoreData.sqlite")
      var failureReason = "There was an error creating or loading the application's saved data."
      do {
          try coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil)
      } catch {
          // Report any error we got.
          var dict = [String: AnyObject]()
          dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
          dict[NSLocalizedFailureReasonErrorKey] = failureReason
  
          dict[NSUnderlyingErrorKey] = error as NSError
          let wrappedError = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)
          // Replace this with code to handle the error appropriately.
          // abort() 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.
          NSLog("Unresolved error \(wrappedError), \(wrappedError.userInfo)")
          abort()
      }
  
      return coordinator
  }()
  
  lazy var managedObjectContext: NSManagedObjectContext = {
      // Returns the managed object context for the application (which is already bound to the persistent store coordinator for the application.) This property is optional since there are legitimate error conditions that could cause the creation of the context to fail.
      let coordinator = self.persistentStoreCoordinator
      var managedObjectContext = NSManagedObjectContext(concurrencyType: .MainQueueConcurrencyType)
      managedObjectContext.persistentStoreCoordinator = coordinator
      return managedObjectContext
  }()
  
  // MARK: - Core Data Saving support
  
  func saveContext () {
      if managedObjectContext.hasChanges {
          do {
              try managedObjectContext.save()
          } catch {
              // Replace this implementation with code to handle the error appropriately.
              // abort() 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.
              let nserror = error as NSError
              NSLog("Unresolved error \(nserror), \(nserror.userInfo)")
              abort()
          }
      }
  }
  </code></pre>
  
  <p>These functions will never call, there is any other way to use core data on apple watch?</p>
  
  <p>Or Am I on wrong track in concept of apple watchOS 2 with core data?  </p>
  
  <p>Thanks for any advice.</p>