Spring GraphQLmultiple schemas with Query per file

Question

with Spring-GraphQl if I have following two schemas in the resources/graphql folder:

schema1:

type Query {
  bookById(id: ID): Book
}

type Book {
  id: ID
  name: String
  pageCount: Int
  author: Author
}

type Author {
  id: ID
  firstName: String
  lastName: String
}

schema2:

type Query {
  personByName(name: String): Person
}

type Person {
  id: ID
  firstName: String
  lastName: String
}

Spring-GraphQL seems to be merging them into one GraphQL schema file and starting of Spring-Boot Graphql app ends with following error:

Caused by: graphql.schema.idl.errors.SchemaProblem: errors=[‘Query’ type [@1:1] tried to redefine existing ‘Query’ type [@1:1]]

When I change it to:

schema1:

type Query {
  bookById(id: ID): Book
  personByName(name: String): Person
}

schema2:

type Book {
  id: ID
  name: String
  pageCount: Int
  author: Author
}

type Author {
  id: ID
  firstName: String
  lastName: String
}

type Person {
  id: ID
  firstName: String
  lastName: String
}

it works perfectly good and I am able to call both queries with graphiql. How graphql spring works with multiple schemas? It seems spring-graphql merges files into one schema so multiple Query types per file breaks the app.

Thanks for answer.

Hi, yes I followed advice from Brian Clozel and it worked. I marked his answer as helpful. — Feb 10 at 10:59

Brian ClozelBrian Clozel 56.7k15 gold badges169 silver badges176 bronze badges · Accepted Answer · 2023-01-04 08:58:56Z

Spring GraphQL is loading all schema resources under the configured location and is using TypeDefinitionRegistry::merge to create a single schema out of them.

I think that redifining any type (even the Query one) should raise an error, otherwise this could hide important issues and conflicting schema definitions. That’s what GraphQL Java’s TypeDefinitionRegistry is doing.

You can organize your schema files like this:

graphql/schema.graphqls

type Query {

}

// add common directives, scalars, etc

graphql/books.graphqls

extend type Query {
  bookById(id: ID): Book
}

type Book {
  id: ID
  name: String
  pageCount: Int
  author: Author
}

type Author {
  id: ID
  firstName: String
  lastName: String
}

graphql/person.graphqls

extend type Query {
  personByName(name: String): Person
}

type Person {
  id: ID
  firstName: String
  lastName: String
}

Serhii MoskalenkoSerhii Moskalenko 1 · Accepted Answer · 2023-09-14 08:56:58Z

-1

Brian Klosel’s solution works with several query files 🙂 But when I try to run the tests, I get one exception. Maybe someone knows how to solve it?

answered 54 mins ago

Serhii Moskalenko

1

New contributor

1

Serhii Moskalenko, this does not provide an answer to the question. You can search for similar questions, or refer to the related and linked questions on the right-hand side of the page to find an answer. If you have a related but different question, ask a new question, and include a link to this one to help provide context. See: Ask questions, get answers, no distractions

– mozway

52 mins ago

Spring GraphQLmultiple schemas with Query per file