GraphQL Subscriptions Example

Install dependencies: npm install or yarn install

Run migrations (sqlite database) npm run migrations or yarn run migrations

Start server npm run start or yarn run start

Open graphiql in two differents tabs: http://localhost:5678/graphiql

In the first one run the next mutation:

mutation addProduct {
  productAdd(product: {
    name: "coffee"
    description: "the best coffee"
    stock: 12
  }) {
    id
    name
    description
    stock
  }
}

In the second one, run the subscription:

subscription product {
  productChanged(product_id: 1) {
    name
    description
    stock
  }
}

Back to the first tab, run the next mutation to create an order and decrease stock, you should see the remaining stock (9) in the second tab

mutation createOrder {
  orderAdd(order: {
    customer_name: "German"
    products_id: 1
    quantity: 3
  }) {
    id
  }
}