feat: solution exercise 4

src/data.js

@@ -81,11 +81,29 @@ function getStoreProducts(storeId) {
 }
 
 function getReservationProducts(reservationId) {
-  return [];
+  return reservationProducts
+    // Join
+    .filter((rp) => rp.reservationId === reservationId)
+    .map((rp) => ({
+      product: products.find(p => p.id === rp.productId),
+      quantity: rp.quantity
+    }));
 }
 
 function createReservation(reservation) {
-  return {};
+  const reservationId = uuid();
+  const newReservation = {
+    date: new Date(),
+    id: reservationId,
+  };
+  reservations.push(newReservation);
+  reservationProducts = reservationProducts.concat(
+    reservation.reservationProducts.map((reservationProduct) => ({
+      ...reservationProduct,
+      reservationId
+    })
+  ));
+  return newReservation;
 }
 
 module.exports = {

src/resolvers.js

@@ -47,6 +47,11 @@ module.exports = {
       return data.getStore(id);
     },
   },
+  Reservation: {
+    reservationProducts: async ({ id }) => {
+      return data.getReservationProducts(id);
+    }
+  },
   Store: {
     products: async ({ id: storeId }) => {
       return data.getStoreProducts(storeId);
@@ -62,5 +67,14 @@ module.exports = {
       const { city, name, number, postalCode, street } = input;
       return data.createStore({ city, name, number, postalCode, street });
     },
+    createReservation: async (parent, { input }) => {
+      try {
+        await createReservationSchema.validate(input);
+      } catch (e) {
+        throw new UserInputError('Invalid input.', { validationErrors: e.errors });
+      }
+      const { reservationProducts } = input;
+      return data.createReservation({ reservationProducts });
+    }
   }
 };

src/typeDefs.js

@@ -23,6 +23,17 @@ module.exports = gql`
     street: String
   }
 
+  type ReservationProduct {
+    product: Product
+    quantity: Int
+  }
+
+  type Reservation {
+    date: String
+    id: String
+    reservationProducts: [ReservationProduct]
+  }
+
   # The "Query" type is the root of all GraphQL queries.
   # (A "Mutation" type will be covered later on.)
   type Query {
@@ -38,7 +49,17 @@ module.exports = gql`
     street: String
   }
 
+  input ReservationProductInput {
+    productId: String!
+    quantity: Int
+  }
+
+  input ReservationInput {
+    reservationProducts: [ReservationProductInput]
+  }
+
   type Mutation {
     createStore(input: StoreInput): Store
+    createReservation(input: ReservationInput): Reservation
   }
 `;