Interface example

interface.graphql

interface SubjectOfComment {
  commentedOn: [Comment!]! @relation(name: "SubjectOfComment")
}

interface ObjectOfComment {
  comments: [Comment!]! @relation(name: "ObjectOfComment")
}

type User implements SubjectOfComment, ObjectOfComment {
  id: ID!
  name: String!
  posts: [Post!]! @relation(name: "AuthorPosts")

  # SubjectOfComment
  commentedOn: [Comment!]! @relation(name: "SubjectOfComment")

  # ObjectOfComment
  comments: [Comment!]! @relation(name: "ObjectOfComment")
}

type Post implements ObjectOfComment {
  id: ID!
  title: String!
  author: User @relation(name: "AuthorPosts")

  # ObjectOfComment
  comments: [Comment!]! @relation(name: "ObjectOfComment")
}

type Comment {
  id: ID!
  text: String!
  subject: SubjectOfComment @relation(name: "SubjectOfComment")
  object: ObjectOfComment @relation(name: "ObjectOfComment")
}