The other way to express this is with generics, `c...

# announcements

[karelpeeters]

The other way to express this is with generics, class Entity<D: Int?>(val id: D) and then keep the nullability in the type throughout the code.

[Czar]

how do I create a new Entity in this case? the id has to be null for hibernate to generate it, but with val id: D I cannot assign null to id

[karelpeeters]

D can be nullable, right?

[Czar]

Oh, now I see what you meant. Thanks 🙂

[Czar]

Nope, I was right, doesn't work
class Entity<T: Long?>(val id: T = null)
there is an error:

Null can not be a value of a non-null type T