so basically I want something like this:

query {
  posts (where: {...}) {
    content
    comments {
      count // <- how to do this efficiently?
    }
  }
}

I think you need to make a new type and resolver for

comments

. Something like this:

type Comments {
  comments: [Comment!]!
  count: Int!
}

and then create the resolver with an aggregate like in the node tutorial: https://github.com/howtographql/graphql-js/blob/master/src/resolvers/Query.js

But I thought Prisma already has its generated aggregation functions so you don’t need to do this?