Allow interfaces to be mapped as types or inputs

[phillip-kruger]

Fix #926

Signed-off-by:Phillip Kruger phillip.kruger@gmail.com

[robp94]

@phillip-kruger How would you use interfaces as input?

[phillip-kruger]

@robp94 from the client or the server ?

[robp94]

Server. For example, the added test. https://github.com/phillip-kruger/smallrye-graphql/blob/fc3ad76f8618ca89817399a4d9273fdb83058d4e/server/tck/src/test/java/io/smallrye/graphql/test/apps/interfaces/api/FoodResource.java

[phillip-kruger]

So are you asking how you would know what the concrete class is ?

[robp94]

When I add a mutation to the linked api like this:

    @Mutation
    public Eatable inputEatable(Eatable eatable) {
        return eatable;
    }

I get the following error
Class org.acme.Eatable is used as input, but does neither have a public default constructor nor a JsonbCreator method

I don't see how to provide an JsonBCreator at the interface, for example, like what the concrete class is. Could you provide an example in the test, or is this not supported, and I misunderstood the pull request?

[phillip-kruger]

mmm, so the schema generate ok (that is what this PR did) but it fails at runtime ? Please open a bug, referencing this and if possible add a reproducer.

[robp94]

Quarkus fails to start.