Sắp xếp Realm in IOS

// Sort tan dogs with names starting with "B" by name
let sortedDogs = realm.objects(Dog.self).filter("color = 'tan' AND name BEGINSWITH 'B'").sorted(byKeyPath: "name")

class Person: Object {
  dynamic var name = ""
  dynamic var dog: Dog?
}
class Dog: Object {
  dynamic var name = ""
  dynamic var age = 0
}

let dogOwners = realm.objects(Person.self)
let ownersByDogAge = dogOwners.sorted(byKeyPath: "dog.age")