Question 115397 in Mongodb Question posted in
The official documentation can be found here.

Mongodb – Mongoose stopped accepting callbacks for some of its functions

I’ve been using callbacks for .save() and .findOne() for a few days now and just today I encounter these errors:

throw new MongooseError('Model.prototype.save() no longer accepts a callback')

MongooseError: Model.prototype.save() no longer accepts a callback

and

MongooseError: Model.findOne() no longer accepts a callback

It’s really awkward given that callbacks are still accepted in the docs at least for .findOne().

app.post("/register", (req, res) => {
    const newUser = new User({
        email: req.body.username,
        password: req.body.password
    });

    newUser.save((err) => {
        if (err) console.log(err)
        else res.render("secrets");
    });
});

This is what used to work for me, using express and mongoose. Please let me know how to fix it.

Tags:

8

Answers


  1. 0 
    app.post("/login",function(req,res){
    const username = req.body.username;
    const password = req.body.password;

    User.findOne({email:username})
    .then((foundUser) => {
        if(foundUser){
            if(foundUser.password === password){
                res.render("secrets");
            }
        }
   })
   .catch((error) => {
       //When there are errors We handle them here

console.log(err);
       res.send(400, "Bad Request");
   });
      
});

    This works for me, also im doing the web dev bootcamp by angela yu.

    It seems like now you have to use => then and =>catch for the handling

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  2. 0 
    app.post("/register", function(req, res){
    const newUser = new User({
        email: req.body.email,
        password: req.body.password
    });

    newUser.save().then(()=>{
        res.render("secrets");
    }).catch((err)=>{
        console.log(err);
    })
});

    Hope it helped!

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  3. 0

    MongooseError: Model.find() no longer accepts a callback

    Since the callback function has been deprecated from now onwards.
    If you are using these functions with callbacks, use async/await or promises if async functions don’t work for you.

    app.get("/articles", async (req, res) => {
  try {
    const articles = await Article.find({ });
    res.send(articles);
    console.log(articles);
  } catch (err) {
    console.log(err);
  }
});
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  4. 0

    Good day to everyone! Mongoose has just made a new update, mongoose has now got rid of callbacks. So that means, now instead of doing this

    //Old way ( doesn't work anymore )

data.save((err, result) => {
   if(!err) console.log(result);
})

    You should do it like this!

    //New way ( use this in your projects )

let output;
(async () => {
   output = await data.save();
})
console.log(output);

    This also applies for every other mongoose callback

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  5. 0 
    // old way (deprecated)

Model.find(function(err, models){
  if (err) {
    console.log(err);
  }else {
    console.log(models);
  }
});


// new way

Model.find()
.then(function (models) {
  console.log(models);
})
.catch(function (err) {
  console.log(err);
});
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  6. 0 
    In index.js

const mongoose = require('mongoose');

var mongoURI = 'mongodb+srv://<username>:<password>@cluster0.mgwgzxk.mongodb.net/test' 

const connectToMongo =  () => {
     mongoose.connect(mongoURI)
     .then( ()=>
        console.log("Connected to mongo Successful")
    )
}


module.exports = connectToMongo;
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  7. 0

    Anyone whose facing issue connecting to mongodb. Just use async await and you are good to go…

    const mongoose = require('mongoose');

const mongoURI = "Connection URI";

const connectToMongo = async () => {
 mongoose.connect(mongoURI, await console.log("Connected to mongo `Successful")`
    );
}

module.exports = connectToMongo;
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  8. 0

    You can either use then catch or async await

    then catch method:

    mongoose
  .connect(process.env.MONGO_URI)
  .then(() => {
    console.log("Connected to MongoDB");
  })
  .catch((err) => {
    console.log(err);
  });

    async await method:

    const connectToMongo = async () => {
  await mongoose.connect(process.env.MONGO_URL);
  console.log("Connected to MongoDB");
};

connectToMongo();
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