Inherit interface resolvers in Apollo Federation

Question

Is there a way to use interface resolver inheritance with Apollo Federation?
I've found inheritResolversFromInterfaces: true which is an option for makeExecutableSchema. I couldn't find a way though to apply this option to a federated schema.

Answer 1

You can use addResolveFunctionsToSchema from graphql-tools (or addResolversToSchema from @graphql-tools/schema but I’m not sure if it works with this version) like this:

  const federatedSchema = buildSubgraphSchema(typeDefs);
  const schema = addResolveFunctionsToSchema({
    inheritResolversFromInterfaces: true,
    resolvers,
    schema: federatedSchema,
  });