slides

README.md

@@ -3,6 +3,8 @@
 To get up-and-running, install the node dependencies and start the server.
 🚀 Go to http://localhost:4000/ to play in the GraphQL Playground.
 
+Slides: https://app.box.com/s/6l6xi3mm26d7ur9g7n05egguc6dkyz3v
+
 ```
 npm i
 npm start

src/typeDefs.js

@@ -52,7 +52,7 @@ module.exports = gql`
   }
 
   input ReservationProductInput {
-    productId: String!
+    productId: ID
     quantity: Int
   }