how to convert model to relationmodelowner

Model is already RealtionOwner because Model extends RelationOwner .. I have not used weblink but in Jlink I would do this:

Model model = session.GetCurrentModel();

RelationOwner relOwner = (RelationOwner) model; //casting model to relation owner, but I suppose you do not have to cast it in javascript because it is dynamically typed language so it will automatically handle inheritence

However I do not have to cast it in Jlink because it already have RelationOwner methods so both of theese is valid:

model.GetRelations();

relOwner.GetRelations();