events.js:352 throw er; // Unhandled 'error' event

Question

I try to follow a project to learn mongoDB, Express...

But i'm blocked for the moment. Indeed, when i want to do a request on postman to update a user, i have this error (image):

events.js:352 throw er; // Unhandled 'error' event

Repository Git of this project: https://github.com/l-jonathan/projet-mern

I'm trying a lot of solutions find on the web but nothing work, if you have an idea, i take it !

Thanks !

Answer 1

You are mixing async-await with promises in your updateUser function.

Try to change it like this:

module.exports.updateUser = async (req, res) => {
  if (!ObjectID.isValid(req.params.id))
    return res.status(400).send('ID unknown ici : ' + req.params.id);

  try {
    const user = await UserModel.findOneAndUpdate(
      { _id: req.params.id },
      {
        $set: {
          bio: req.body.bio,
        },
      },
      { new: true, upsert: true, setDefaultsOnInsert: true }
    );

    res.status(200).json(user);
  } catch (err) {
    return res.status(500).json({ message: err });
  }
};

Also, in your server.js file you shouldn't use the deprecated body-parser library.
Change

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));

To

app.use(express.json());
app.use(express.urlencoded({extended: true}));

And remove this line

const bodyParser = require('body-parser');

Finally, in your db.js file you should add the useNewUrlParser , useUnifiedTopology and useFindAndModify properties to the connect method:

mongoose
  .connect("mongodb+srv://" + process.env.DB_USER_PASS + "@cluster0.dui5l.mongodb.net/mern-project", {
      useNewUrlParser: true,
      useUnifiedTopology: true,
      useFindAndModify: false,
  })
  ...