Set up MongoDB and Reviews data source

Author: lorensr

src/data-sources/Reviews.js

@@ -0,0 +1,7 @@
+import { MongoDataSource } from 'apollo-datasource-mongodb'
+
+export default class Reviews extends MongoDataSource {
+  all() {
+    return this.collection.find().toArray()
+  }
+}

src/db.js

@@ -0,0 +1,15 @@
+import { MongoClient } from 'mongodb'
+
+export let db
+
+const URL = 'mongodb://localhost:27017/guide'
+
+const client = new MongoClient(URL, { useNewUrlParser: true })
+client.connect(e => {
+  if (e) {
+    console.error(`Failed to connect to MongoDB at ${URL}`, e)
+    return
+  }
+
+  db = client.db()
+})

src/index.js

@@ -1,12 +1,7 @@
 import { ApolloServer, gql } from 'apollo-server'
 import { getAuthIdFromJWT } from './util/auth'
-
-const reviews = [
-  {
-    text: 'Super-duper book.',
-    stars: 5
-  }
-]
+import Reviews from './data-sources/Reviews'
+import { db } from './db'
 
 const server = new ApolloServer({
   typeDefs: gql`
@@ -36,7 +31,7 @@ const server = new ApolloServer({
     Query: {
       me: (_, __, context) => context.user,
       hello: () => '🌍🌏🌎',
-      reviews: () => reviews
+      reviews: (_, __, { dataSources }) => dataSources.reviews.all()
     },
     Review: {
       fullReview: review =>
@@ -51,6 +46,9 @@ const server = new ApolloServer({
       }
     }
   },
+  dataSources: () => ({
+    reviews: new Reviews(db.collection('reviews'))
+  }),
   context: async ({ req }) => {
     const context = {}