server.js

const express = require('express')
const cors = require("cors")
const { MongoClient } = require('mongodb')

const userRoutes = require('./routes/userRoutes')
const postRoutes = require('./routes/postRoutes')
const authRoutes = require('./routes/authRoutes')

const app = express()
app.use(express.json())
app.use(cors())

async function onMongoConnect(mongoClient) {
  const db = mongoClient.db('saeApp')

  const users = db.collection('users')
  const posts = db.collection('posts')

  // const cursor = await posts
  //   .aggregate([
  //     {
  //       $lookup: {
  //         from: 'users',
  //         localField: 'author',
  //         foreignField: 'username',
  //         as: 'author',
  //       },
  //     },
  //   ])
  //   .toArray()
  //
  // console.log(cursor)

  userRoutes(app, { users })
  postRoutes(app, { posts })
  authRoutes(app, { users })
}

const credentials = { username: 'mongo', password: 'mongo' }
const mongoConnString = `mongodb+srv://${credentials.username}:${credentials.password}@cluster0.kmdytlq.mongodb.net/?retryWrites=true&w=majority`
new MongoClient(mongoConnString)
  .connect()
  .catch(console.error)
  .then(onMongoConnect)

app.listen(3000, () => {
  // eslint-disable-next-line no-console
  console.log('Server startet on Port 3000')
})