GraphQL - Is it possible to edit the schema ?

[Pilpin]

Hello,

I would like to edit the schema so I tried using a function like public GraphQLSchema.Builder editSchema(@Observes GraphQLSchema.Builder builder) but as far as I understand I can only add things to the builder, I can not modify the schema.

I tried something like this

public GraphQLSchema.Builder edit(@Observes GraphQLSchema.Builder builder) {
    GraphQLSchema _schema = SchemaTransformer.transformSchema(builder.build(), new GraphQLTypeVisitorStub() {
        @Override
        public TraversalControl visitGraphQLObjectType(
                GraphQLObjectType node,
                TraverserContext<GraphQLSchemaElement> context
        ) {
            if (condition) {
                System.out.println(node);
                return changeNode(context, node.transform(b -> {
                    b.doSomething();
                }));
            }

            return super.visitGraphQLObjectType(node, context);
        }
    });

    return GraphQLSchema.newSchema(_schema);
}

The System.out.println(node); gets executed but the schema at url/q/dev-ui/io.quarkus.quarkus-smallrye-graphql/graphql-schema doesn't change.

Am I missing something ? Is this even possible ?

Thanks.

[quarkus-bot[bot]]

/cc @jmartisk (graphql), @phillip-kruger (graphql)

[phillip-kruger]

What do you want to add to the schema ? There might be easier ways to do it. What you have above should work. Can you share a reproducer ?

[Pilpin]

I had java interfaces that behaved as graphQL Types in the schema thanks to the @Type annotation

@Type("MyType")
public interface MyInterface {
...
}

The problem is now I need to move theses interfaces to a library in which I won't be able to use the @Type annotation, so I thought I could try and change this during graph building.

Is there a way to "annotate" classes and interfaces in libraries ?
I've found this smallrye/smallrye-graphql#316 but I'm not sure I'll be able to do what I want.

I'll try and make a reproducer today.

[Pilpin]

Here's the reproducer https://github.com/Pilpin/quarkus-graphql-schema-bug

I don't think the builder returned is used.

[phillip-kruger]

I'll have a look at your reproducer, but so far what I can see is you try to change the Country to be another object in GraphQL ? Have you looked at Adapters ? That might be what you want.

[Pilpin]

In the reproducer I'm trying to add a field to the country object, and the logs seem to show that it works, up until the observing function returns.
The Adapter class and @AdaptWith annotation could be a solution but I was trying not to create another class

[phillip-kruger]

When you return the original builder, with some modification. does that work ?

[Pilpin]

Yes it does. But as far as I know I can't edit the schema this way, I can only add objects to it.

[phillip-kruger]

We probably need a new feature in smallrye graphql to allow adding a Transformer. Please create a feature request in Smallrye GraphQL