Is it possible to extend some other class and implement RealmModel?

Question

I'm trying to extend my model from a BaseModel and then implement RealmModel .

@RealmClass
public class User extend BaseModel implements RealmModel

But it is throwing an error:

error: Realm model classes must either extend RealmObject or implement RealmModel to be considered a valid model class

Please help.

Answer 1

As mentioned in Realm's GitHub repository, inheritance and polymorphism are not implemented in Realm just yet.

As one of the contributors described it :

Realm currently is using byte code manipulation to replace field accessors and using annotation processor to create proxy classes. Enabling RealmObject to extend from the other class/abstract class will increase a bit complexity of Realm. So it is not implemented right now. But I agree it is something we should support.

You can read more here .

I guess that for the time being, you will have to think of another way to write your classes.

Answer 2

It is very unfortunate, but RealmModel exists so that you don't need to inherit properties and methods from RealmObject .

I tried extending a base class that only contained fields annotated with @Ignore , but even that is not supported at the moment .

Only way to "share fields" is to share the accessors through interface.