feat: solution exercise 3

src/data.js

@@ -19,6 +19,38 @@ const stores = [
   }
 ];
 
+const products = [{
+  description: 'Een broodje om u tegen te zeggen. Lekker, lekker, lekker!',
+  id: '9e3de707-8e96-45c8-8c1a-75d79fe74768',
+  name: 'Scampi Manis',
+  price: 5,
+  storeId: 'cc406ed9-fc02-4185-b073-8c12b61b5c79',
+}, {
+  description: 'Eentje met kaas en fricandon, voor den groten honger.',
+  id: '1535f2a6-4341-4db0-a9c8-455c2347dcaf',
+  name: 'Gitaar',
+  price: 5,
+  storeId: 'cc406ed9-fc02-4185-b073-8c12b61b5c79',
+}, {
+  description: 'Tomatensaus, kaas, ham, salami, champignons, paprika',
+  id: '5bb3fbcc-7ec2-44fe-a04b-a0251cecf1e6',
+  name: '4 Seizoenen Large',
+  price: 17,
+  storeId: '5f2919aa-333a-4745-8166-3002ab30de0e',
+}, {
+  description: 'Bolognaisesaus, kaas, paprika, ham, salami, champignons',
+  id: '037e74f6-ae73-47a3-9acf-d1de0cdcd565',
+  name: 'Calzone Large',
+  price: 17,
+  storeId: '5f2919aa-333a-4745-8166-3002ab30de0e',
+}, {
+  description: 'Tomatensaus, pepperoni, rode ui, paprika gehakt, jalapenos',
+  id: 'e8619184-2e86-4db5-b8ba-596720006a0f',
+  name: 'Hot \'n Spicy',
+  price: 20,
+  storeId: '5f2919aa-333a-4745-8166-3002ab30de0e',
+}];
+
 function createStore({ city, name, number, postalCode, street }) {
   const newStore = {
     city,
@@ -32,11 +64,21 @@ function createStore({ city, name, number, postalCode, street }) {
   return newStore;
 }
 
+function getStore(storeId) {
+  return stores.find((s) => s.id === storeId);
+}
+
 function getStores() {
   return stores;
 }
 
+function getStoreProducts(storeId) {
+  return products.filter((p) => p.storeId === storeId)
+} 
+
 module.exports = {
   createStore,
-  getStores
+  getStore,
+  getStores,
+  getStoreProducts
 };

src/index.js

@@ -25,6 +25,7 @@ const typeDefs = require('./typeDefs');
 //    name the variable `withProducts`.
 
 // 1) Check: https://graphql.org/learn/queries/#variables
+// 4) products @include(if: $withProducts) {
 
 // In the most basic sense, the ApolloServer can be started
 // by passing type definitions (typeDefs) and the resolvers

src/resolvers.js

@@ -15,11 +15,30 @@ const createStoreSchema = yup.object()
     street: yup.string().max(255),
   });
 
+const getStoreSchema =  yup.object()
+  .shape({
+    id: yup.string().min(36).max(36),
+  });
+
 // Resolvers define the technique for fetching the types in the
 // schema.
 module.exports = {
   Query: {
     stores: () => data.getStores(),
+    store: async (parent, input) => {
+      try {
+        await getStoreSchema.validate(input);
+      } catch (e) {
+        throw new UserInputError('Invalid input.', { validationErrors: e.errors });
+      }
+      const { id } = input;
+      return data.getStore(id);
+    },
+  },
+  Store: {
+    products: async ({ id: storeId }) => {
+      return data.getStoreProducts(storeId);
+    }
   },
   Mutation: {
     createStore: async (parent, { input }) => {

src/typeDefs.js

@@ -4,6 +4,14 @@ const { gql } = require('apollo-server');
 // which ways the data can be fetched from the GraphQL server.
 module.exports = gql`
   # Comments in GraphQL are defined with the hash (#) symbol.
+
+  type Product {
+    description: String
+    id: String
+    name: String
+    price: Float
+  }
+
   # This "Store" type can be used in other type declarations.
   type Store {
     city: String
@@ -11,6 +19,7 @@ module.exports = gql`
     name: String
     number: Int
     postalCode: String
+    products: [Product]
     street: String
   }
 
@@ -18,6 +27,7 @@ module.exports = gql`
   # (A "Mutation" type will be covered later on.)
   type Query {
     stores: [Store]
+    store(id: String): Store
   }
 
   input StoreInput {