RealmSwift:如何正确创建一对一关系？

class Person: Object {
    @objc dynamic var name = ""
    @objc dynamic var age = 0
    @objc dynamic var address: Address?
}

class Address: Object {
    @objc dynamic var street = ""
    @objc dynamic var city = ""
    @objc dynamic var person: Person?
}

let person = Person()
person.name = "John"
person.age = 30

let address = Address()
address.street = "123 Main St"
address.city = "New York"

person.address = address
address.person = person

// 保存对象到数据库
let realm = try! Realm()
try! realm.write {
    realm.add(person)
    realm.add(address)
}

let realm = try! Realm()
let persons = realm.objects(Person.self)
for person in persons {
    if let address = person.address {
        print("Person: \(person.name), Address: \(address.street), \(address.city)")
    }
}