Schema and Types

Code

type Author {
  id: ID!
  name: String!
  bio: String
  books: [Book!]!
}

type Book {
  id: ID!
  title: String!
  author: Author!
  pages: Int
  published: Boolean
}

enum Genre {
  FICTION
  NON_FICTION
  SCIENCE
}

scalar DateTime

Explanation

A GraphQL schema declares object types with fields, where the ! suffix marks non-nullable fields and [Type!] denotes a non-null list of non-null items. Enums restrict a field to a fixed set of values, and custom scalars like DateTime delegate parsing to a resolver. Every schema needs a Query root type to be executable.

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