try-schema.graphql

type Book {
  id: ID!
  title: String!
  author: Author
  description: String!
}

input BookInput {
  title: String!
  description: String!
}

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

type Query {
  getAllBooks2: [Book]!
  getBook2(id: ID!): Book!
}

type Mutation {
  addBook2(book: BookInput!): Boolean!
}