Connect Apollo with mongodb - mongodb

Question

I want to connect my Apollo server with my mongoDB. I know there are many examples out there, but I get stuck at the async part and did not found a solution or example for that (that's strange, am I completly wrong?)
I started with the example from next.js https://github.com/zeit/next.js/tree/master/examples/api-routes-apollo-server-and-client .
But the mongodb integration is missing.
My code
pages/api/graphql.js
import {ApolloServer} from 'apollo-server-micro';
import {schema} from '../../apollo/schema';
const apolloServer = new ApolloServer({schema});
export const config = {
api: {
bodyParser: false
}
};
export default apolloServer.createHandler({path: '/api/graphql'});
apollo/schema.js
import {makeExecutableSchema} from 'graphql-tools';
import {typeDefs} from './type-defs';
import {resolvers} from './resolvers';
export const schema = makeExecutableSchema({
typeDefs,
resolvers
});
apollo/resolvers.js
const Items = require('./connector').Items;
export const resolvers = {
Query: {
item: async (_parent, args) => {
const {id} = args;
const item = await Items.findOne(objectId(id));
return item;
},
...
}
}
apollo/connector.js
require('dotenv').config();
const MongoClient = require('mongodb').MongoClient;
const password = process.env.MONGO_PASSWORD;
const username = process.env.MONGO_USER;
const uri = `mongodb+srv://${username}:${password}#example.com`;
const client = await MongoClient.connect(uri);
const db = await client.db('databaseName')
const Items = db.collection('items')
module.exports = {Items}
So the problem is the await in connector.js. I have no idea how to call this in an async function or how to provide the MongoClient on an other way to the resolver. If I just remove the await, it returns – obviously – an pending promise and can't call the function .db('databaseName') on it.

Answer 1

Unfortunately, we're still a ways off from having top-level await.
You can delay running the rest of your code until the Promise resolves by putting it inside the then callback of the Promise.
async function getDb () {
const client = await MongoClient.connect(uri)
return client.db('databaseName')
}
getDb()
.then(db => {
const apollo = new ApolloServer({
schema,
context: { db },
})
apollo.listen()
})
.catch(e => {
// handle any errors
})
Alternatively, you can create your connection the first time you need it and just cache it:
let db
const apollo = new ApolloServer({
schema,
context: async () => {
if (!db) {
try {
const client = await MongoClient.connect(uri)
db = await client.db('databaseName')
catch (e) {
// handle any errors
}
}
return { db }
},
})
apollo.listen()