Realm 객체 모델 정의 - Kotlin SDK

// Implements the `RealmObject` interface
class Frog : RealmObject { // Empty constructor required by Realm
    @PrimaryKey
    var _id: ObjectId = ObjectId()
    var name: String = ""
    var age: Int = 0
    var species: String? = null
    var owner: String? = null
}

// Implements `EmbeddedRealmObject` interface
class EmbeddedAddress : EmbeddedRealmObject {
    // CANNOT have primary key
    var street: String? = null
    var city: String? = null
    var state: String? = null
    var postalCode: String? = null
    var propertyOwner: Contact? = null
}

// Implements the `AsymmetricRealmObject` interface
class WeatherSensor : AsymmetricRealmObject {
    @PersistedName("_id")
    @PrimaryKey
    var id: ObjectId = ObjectId()
    var deviceId: String = ""
    var temperatureInFarenheit: Float = 0.0F
    var barometricPressureInHg: Float = 0.0F
    var windSpeedInMph: Int = 0
}

// RealmList<E> can be any supported primitive
// or BSON type, a RealmObject, or an EmbeddedRealmObject
class Frog : RealmObject {
    var _id: ObjectId = ObjectId()
    var name: String = ""
    // List of RealmObject type (CANNOT be nullable)
    var favoritePonds: RealmList<Pond> = realmListOf()
    // List of EmbeddedRealmObject type (CANNOT be nullable)
    var favoriteForests: RealmList<EmbeddedForest> = realmListOf()
    // List of primitive type (can be nullable)
    var favoriteWeather: RealmList<String?> = realmListOf()
}
class Pond : RealmObject {
    var _id: ObjectId = ObjectId()
    var name: String = ""
}

// RealmSet<E> can be any supported primitive or
// BSON type or a RealmObject
class Frog : RealmObject {
    var _id: ObjectId = ObjectId()
    var name: String = ""
    // Set of RealmObject type (CANNOT be nullable)
    var favoriteSnacks: RealmSet<Snack> = realmSetOf()
    // Set of primitive type (can be nullable)
    var favoriteWeather: RealmSet<String?> = realmSetOf()
}
class Snack : RealmObject {
    var _id: ObjectId = ObjectId()
    var name: String = ""
}

// RealmDictionary<K, V> can be any supported
// primitive or BSON types, a RealmObject, or
// an EmbeddedRealmObject
class Frog : RealmObject {
    var _id: ObjectId = ObjectId()
    var name: String = ""
    // Dictionary of RealmObject type (value MUST be nullable)
    var favoriteFriendsByPond: RealmDictionary<Frog?> = realmDictionaryOf()
    // Dictionary of EmbeddedRealmObject type (value MUST be nullable)
    var favoriteTreesInForest: RealmDictionary<EmbeddedForest?> = realmDictionaryOf()
    // Dictionary of primitive type (value can be nullable)
    var favoritePondsByForest: RealmDictionary<String?> = realmDictionaryOf()
}

// Percent encode . or $ characters to use them in map keys
val mapKey = "Hundred Acre Wood.Northeast"
val encodedMapKey = "Hundred Acre Wood%2ENortheast"