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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.
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Answer: Kotlin provides a special type of class called data class, which is usually used for objects that act as a store for data properties and has no business logic or member functions. It provides a lot of advantages with reduced boilerplate code.
data class User(val name: String, val age: Int) fun main(args: Array<String>) { val u1 = User("John", 29) val u2 = u1. copy() val u3 = u1. copy(name = "Amanda") println("u1 hashcode = ${u1. hashCode()}") println("u2 hashcode = ${u2.
Data classes specialize in holding data. The Kotlin compiler automatically generates the following functionality for them: A correct, complete, and readable toString() method. Value equality-based equals() and hashCode() methods.
Data classes cannot be abstract, open, sealed, or inner.
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() { If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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