Is there a way to group GraphQL query fields into sub/nested query groups?

Question

I am using GraphQL-Java and I am new to GraphQL.

I am trying to find a way to organize my API in the same way it's done in the GraphQL Hub

Essentially, I want to have my RootQuery as the entry point (like the GraphQLHubAPI in the GraphQL Hub) and then sub groups like Reddit, Github etc in the GraphQL Hub)

I am confused as to what the RedditAPI should be and how I should do the wiring for it. If this is an Object Type, it requires a DataFetcher or some way to resolve request. In their schemas they expose it as QueryObjectType (using JS)

How can I replicate the same structure using GraphQL-Java?

Answer 1

So apparently the answer is to use a data fetcher that returns a dummy object for the "sub-group" objects. This creates the "path" to your leafs. And you can the handle the leafs in the wiring

For example for the Reddit scenario you can a schema like this

schema {
    query: RootQuery
}

type RootQuery {
    RedditAPI: RedditAPI
}

type RedditAPI {
    users: [Users]
    subreddits(name: String!): [subreddit]
}

And then wire it up like this

RuntimeWiring.newRuntimeWiring()
                .type(newTypeWiring("RootQuery")
                        .dataFetcher("RedditAPI", new DataFetcher() {
                            @Override
                            public Object get(DataFetchingEnvironment dataFetchingEnvironment) {
                                return RedditAPI.newBuilder().build();
                            }
                        })
                )
                .type(newTypeWiring("RedditAPI")
                        .dataFetcher("users", usersDataFetcher)
                        .dataFetcher("subreddits", subredditsDataFetcher)
                )
                .build();