CoreDataTest.rb

class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    a = NSEntityDescription.new
    a.name = 'A'
    b = NSEntityDescription.new
    b.name = 'B'
    bs = NSRelationshipDescription.new
    bs.name = 'bs'
    bs.destinationEntity = b
    bs.ordered = true
    a.properties = [bs]
    model = NSManagedObjectModel.new
    model.entities = [a, b]
    store = NSPersistentStoreCoordinator.alloc.initWithManagedObjectModel(model)
    storeURL = NSFileManager.defaultManager.URLsForDirectory(NSDocumentDirectory, inDomains:NSUserDomainMask).first
    storeURL = storeURL.URLByAppendingPathComponent('data.sqlite')
    store.addPersistentStoreWithType(NSSQLiteStoreType, configuration:nil, URL:storeURL, options:nil, error:nil)
    context = NSManagedObjectContext.new
    context.persistentStoreCoordinator = store
    context.undoManager = nil

    start = NSDate.date
    theA = NSManagedObject.alloc.initWithEntity(a, insertIntoManagedObjectContext:context)
    muchBs = 5000.times.map do
      NSManagedObject.alloc.initWithEntity(b, insertIntoManagedObjectContext:context)
    end
    context.save(nil)
    createTime = '%.2fs' % -start.timeIntervalSinceNow
    start = NSDate.date
    theA.setBs(NSOrderedSet.orderedSetWithArray(muchBs))
    context.save(nil)
    associateTime = '%.2fs' % -start.timeIntervalSinceNow

    UIAlertView.alloc.initWithTitle('Results', message:"Create: #{createTime}, Associate: #{associateTime}", delegate:nil, cancelButtonTitle:'OK', otherButtonTitles:nil).show
    true
  end
end