在 Vercel 和 Netlify 上部署 next.js 项目时如何解决 Runtime.UnhandledPromiseRejection 错误？

Question

I'm receiving this error while deploying it on Vercel / Netlify. Receiving the same error for both Vercel and Netlify while deployment. Any steps to resolve this issue would be helpful.

Database code:

import mongoose from 'mongoose';

const connection = {};

async function connect() {
  if (connection.isConnected) {
    console.log('already connected');
    return;
  }
  if (mongoose.connections.length > 0) {
    connection.isConnected = mongoose.connections[0].readyState;
    if (connection.isConnected === 1) {
      console.log('use previous connection');
      return;
    }
    await mongoose.disconnect();
  }
  const db = await mongoose.connect(process.env.MONGODB_URI, {
    // useNewUrlParser: true,
    // useUnifiedTopology: true,
  });
  console.log('new connection');
  connection.isConnected = db.connections[0].readyState;
}

async function disconnect() {
  if (connection.isConnected) {
    if (process.env.NODE_ENV === 'production') {
      await mongoose.disconnect();
      connection.isConnected = false;
    } else {
      console.log('not disconnected');
    }
  }
}

function convertDocToObj(doc) {
  doc._id = doc._id.toString();
  doc.createdAt = doc.createdAt.toString();
  doc.updatedAt = doc.updatedAt.toString();
  return doc;
}

const db = { connect, disconnect, convertDocToObj };
export default db;

Error Screenshot

Error:

( {"errorType":"Runtime.UnhandledPromiseRejection","errorMessage":"MongooseError: The uri parameter to openUri() must be a string, got \"undefined\". Make sure the first parameter to mongoose.connect() or mongoose.createConnection() is a string.","trace":["Runtime.UnhandledPromiseRejection: MongooseError: The uri parameter to openUri() must be a string, got \"undefined\". Make sure the first parameter to mongoose.connect() or mongoose.createConnection() is a string."," at process.<anonymous> (/var/runtime/index.js:35:15)"," at process.emit (events.js:314:20)"," at processPromiseRejections (internal/process/promises.js:209:33)"," at processTicksAndRejections (internal/process/task_queues.js:98:32)"]} )

Answer 1

1)Checkout your connection string from mongoDB.In your .env file and compare it with the data from the atlas

your user is correct? your password is correct? your cluster name is the same? your database name is the same?

1a)Make sure that your .env is in the root folder!

2)Checkout Network Access IP in mongoDB Atlas. Is it active? If not, establish the new one.

3)If you are using VPN turn it off.

4)And lastly =>https://vercel.com/docs/concepts/projects/environment-variables

I hope it helps you; Good luck ;-)