feat: start exercise 3

src/index.js

@@ -11,24 +11,20 @@ const typeDefs = require('./typeDefs');
 // a store, we get a list of products (query) of that store.
 // We pick some products, pick a quantity, and we make a reservation (mutation)
 
-// 🏪  Exercise 2
+// 🏪  Exercise 3
 // --------------
 
-// Creating a mutation.
+// Now we want to display the products for a store, we can select the quantity of each product,
+// and make a reservation.
 
-// 1) Create a type definition for the Mutation `createStore`, to create a store.
-//    Create an input type `StoreInput`, and use it as first argument of `createStore`.
-// 2) Create a resolver function for the Mutation `createStore`.
-// 3) Use `yup` in the resolver function to validate the input. (https://github.com/jquense/yup)
-// 4) Create a service layer. Create a file `storeService.js` and put all business
-//    logic and data base logic in the service layer.
-//    This exercise is focussed on GraphQL but in real-life, middleware will
-//    validate if the user is authorized (e.g. check the Authorization header).
-//    Afterwards the resolver function will validate the input and call the service layer.
-// 5) Try out the GraphQL mutation in the GraphQL Playground (🚀 http://localhost:4000/)
-// 6) Query the stores, and check if the new store is in the list.
-// 7) Extend the store with an address (street, number, postalCode, city) and create a fragment
-//    to query it.
+// 1) Create a Query `store` to retrieve a store by id. Extend the data store to find the right store.
+// 2) Create a list of products with a reference (storeId).
+// 3) Extend the Store type with a list of products. A product has a price, name and description.
+//    `products` becomes a field of the store. Add a resolver function to get the products of a store.
+// 4) Go to the GraphQL Playground and use a directive to query a store with or without products,
+//    name the variable `withProducts`.
+
+// 1) Check: https://graphql.org/learn/queries/#variables
 
 // In the most basic sense, the ApolloServer can be started
 // by passing type definitions (typeDefs) and the resolvers