It seems `JsonClassDiscriminator` doesn’t work on...

# serialization

[aidanvii]

It seems JsonClassDiscriminator doesn’t work on interfaces. The only way I can get polymorphic serialisation/deserialisation to work with interfaces is to register a polymorphic serialiser for it manually (as the docs specify). This ignores JsonClassDiscriminator though, it only seems to work when the discriminator is the default key: type

[ephemient]

@JsonClassDiscriminator + PolymorphicSerializer works for me; when I build and run this snippet, it produces

{
  "__type": "example.Bar"
}

EDIT: I thought this was running as expected when I wrote it, but it doesn't work for me anymore. I must have mixed it up with the Container example below.

Untitled.cpp

[ephemient]

do you have a simple example that doesn't work?

[aidanvii]

Hmm interesting

[aidanvii]

Actually, the same happens on classes, it’s not specific to interfaces

[ephemient]

hmm. so indeed PolymorphicSerializer seems to not recognize the annotation, @JsonClassDiscriminator is only handled inside JSON.

Untitled.cpp

[ephemient]

I'm not sure if this is even resolvable without making ClassDiscriminator available to all formats, but it's worth filing a bug over, I think