schema_3.graphql

type Photo {
  id: ID!
  url: String!
  reviews: [Review]
}

type Query {
  users(id: ID, first_name: String, last_name: String): [User]
  photo(id: ID): [Photo]
  review(id: ID): [Review]
}

type Review {
  id: ID!
  title: String
  body: String
  reviewer: User
}

type User {
  id: ID!
  first_name: String!
  last_name: String!
  photos: [Photo]
}