resolvers.js

const resolvers = {
  // Resolvers can fetch data for fields on the query root. As long as they return
  // data that matches the schema, this can come from anywhere. Here we've hardcoded
  // some data.
  Query: {
    products: () => [
      {
        name: 'Eggs',
        price: 199
      }
    ]
  },
  // They can also retrieve data for individual types. 
  Product: {
    // In this case, we need to access the parent node to fetch related products
    related: (product) => getRelatedProducts(product.id),
    // And here we need to access the arguments passed through to the field as well
    inStockAt: (product, args) => isInStockAtStore(product.id, args.storeId),
  }
}