driesvints/graphql-shop

{
    //
    "require": {
        "php": "^7.4",
        //
        "mll-lab/laravel-graphql-playground": "^2.4",
        "nuwave/lighthouse": "^4.18"
    },
    //
}

"A date string with format `Y-m-d`, e.g. `2011-05-23`."
scalar Date @scalar(class: "Nuwave\\Lighthouse\\Schema\\Types\\Scalars\\Date")

"A datetime string with format `Y-m-d H:i:s`, e.g. `2018-05-23 13:43:32`."
scalar DateTime @scalar(class: "Nuwave\\Lighthouse\\Schema\\Types\\Scalars\\DateTime")

type Query {
    me: User @auth
    orders: [Order!]! @paginate(defaultCount: 10)
    products: [Product!]! @all
    showCart: [Product!] @guard
    users: [User!]! @paginate(defaultCount: 10)
    user(id: ID @eq): User @find
}

type Mutation {
    "Log in to a new session and get the user."
    login(email: String!, password: String!): User!

    "Log out from the current session, showing the user one last time."
    logout: User @guard
    addProductToCart(product: Int!): [Product!] @guard
    purchaseProducts: Order! @guard
    removeProductFromCart(product: Int!): [Product!] @guard
}
type User {
    id: ID!
    name: String!
    email: String!
    created_at: DateTime!
    updated_at: DateTime!
    orders: [Order!]! @hasMany
}
type Product {
    id: ID!
    name: String!
    description: String!
    price: Int!
    created_at: DateTime!
    updated_at: DateTime!
}
type Order {
    id: ID!
    total: Int!
    created_at: DateTime!
    updated_at: DateTime!
    user: User! @belongsTo
    products: [Product!]! @belongsToMany
}

use App\GraphQL\Exceptions\NoCartProducts;
use App\Models\Product;
use Illuminate\Support\Facades\Auth;

class PurchaseProducts
{
    public function __invoke($_, array $args)
    {
        $user = Auth::user();
        $products = Product::whereIn('id', (array) $user->cart)->get();

        if ($products->isEmpty()) {
            throw new NoCartProducts;
        }

        $order = $user->orders()->create(['total' => $products->sum(fn ($product) => $product->price)]);

        $order->products()->sync($products);

        $user->update(['cart' => []]);

        return $order->refresh();
    }
}

use Exception;
use Nuwave\Lighthouse\Exceptions\RendersErrorsExtensions;

class NoCartProducts extends Exception implements RendersErrorsExtensions
{
    public function __construct()
    {
        parent::__construct('No products found in the user\'s cart.');
    }

    public function isClientSafe(): bool
    {
        return true;
    }

    public function getCategory(): string
    {
        return 'custom';
    }

    public function extensionsContent(): array
    {
        return [];
    }
}