How to connect to mongodb database using Nextjs? - mongodb

Question

Trying to connect to my mongodb database in the latest version of Nextjs. Things have changed so much, so I don't longer know what to do.
There's an example of how to set up the connection here: https://github.com/vercel/next.js/tree/canary/examples/with-mongodb
They use this file:
//The mongodb.js file from the example
import { MongoClient } from 'mongodb'
const uri = process.env.MONGODB_URI
const options = {}
let client
let clientPromise
if (!process.env.MONGODB_URI) {
throw new Error('Please add your Mongo URI to .env.local')
}
if (process.env.NODE_ENV === 'development') {
// In development mode, use a global variable so that the value
// is preserved across module reloads caused by HMR (Hot Module Replacement).
if (!global._mongoClientPromise) {
client = new MongoClient(uri, options)
global._mongoClientPromise = client.connect()
}
clientPromise = global._mongoClientPromise
} else {
// In production mode, it's best to not use a global variable.
client = new MongoClient(uri, options)
clientPromise = client.connect()
}
// Export a module-scoped MongoClient promise. By doing this in a
// separate module, the client can be shared across functions.
export default clientPromise
However, they forgot to add how to actually use it. I can't even begin to figure it out.
//pages/api/user.js
import client from '/lib/mongodb.js'
export default async function handler(req, res) {
//How do I connect here?
}
And two bonus questions:
I used to do caching on my database connection. Is it not needed anymore?
What happened to the utils folder? It used to be special, in that it didn't send anything there to the client. Now everyone seem to use lib but I don't think there's anything special with it?

Answer 1

You can do like this:
const dbClient = await client;
const db = dbClient.db('db-name');
const collection = db.collection('collection-name');
// example to get a doc in collection
const doc = await collection.findOne({query:""}, {...options})