Kotlin data class of RealmObject

Question

I'm using Kotlin and Realm to write a data class

data class AuthToken(val register: Boolean,
                     val token: String,
                     val tokenSecret: String,
                     val user: AuthUser)

I have to save the data to db, so I use Realm to save it. But as we know, if I want to save the class to Realm, the AuthToken class has to extend RealmObject.

That's the problem, Kotlin says data classes can't extend classes. so I give up data class, just using a normal Kotlin class as a model then another question comes:

Kotlin class has no getter or setter. As we know Realm class have to set all the property private and write getter and setter.

Now i'm wondering how to solve the problem.

Answer 1

Any Kotlin property in any class has a getter and a setter. So I believe you code should just work as yourself suggested (without data modifier).

https://kotlinlang.org/docs/reference/data-classes.html#data-classes https://kotlinlang.org/docs/reference/java-to-kotlin-interop.html#properties

P.S. I agree that the docs on properties are unclear on the subject

Answer 2

Realm doesn't support Data classes currently. You can see an example of how to write Realm compatible model classes in Kotlin here: https://github.com/realm/realm-java/tree/master/examples/kotlinExample/src/main/kotlin/io/realm/examples/kotlin/model

public open class Person(
        @PrimaryKey public open var name: String = "",
        public open var age: Int = 0,
        public open var dog: Dog? = null,
        public open var cats: RealmList<Cat> = RealmList(),
        @Ignore public open var tempReference: Int = 0,
        public open var id: Long = 0
) : RealmObject() {