auctionService.graphql

type User {
    id: ID!
    username: String!
    history: [Bid]
    favoritePhoto: Photo
    photoGallery: [Photo]
}

type Auction {
    id: ID!
    photo: Photo
    offers: [Bid]
    highestOffer: Bid
}

type Bid {
    id: ID!
    user: User!
    amount: Int!
}

photoService.graphql

enum Species {
    Dog
    Cat
}

type Animal {
    id: ID!
    species: Species
    breed: String!
}

type Photo {
    id: ID!
    animal: Animal
    url: String!
    owner: User!
    auction: Auction!
}