javascript - MongooseError: Model.findOne() no longer accepts a callback - Stack Overflow

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Consider:

app.get("/posts/:postId", function(req, res) {

  const requestedPostId = req.params.postId;

  Post.findOne({_id: requestedPostId}, function(err, post) {
    res.render("post", {
      title: post.title,
      content: post.content
    });
  });

});

This is what used to work for me, using Express.js and Mongoose. How can I fix it?

Consider:

app.get("/posts/:postId", function(req, res) {

  const requestedPostId = req.params.postId;

  Post.findOne({_id: requestedPostId}, function(err, post) {
    res.render("post", {
      title: post.title,
      content: post.content
    });
  });

});

This is what used to work for me, using Express.js and Mongoose. How can I fix it?

• javascript
• node.js
• mongodb
• express
• mongoose

Share Improve this question Follow edited Mar 7, 2023 at 11:46 Peter Mortensen 31.6k2222 gold badges110110 silver badges133133 bronze badges asked Mar 2, 2023 at 13:25 Aniruddha BiswasAniruddha Biswas 2111 gold badge11 silver badge33 bronze badges 1

• 2 Seems like they dropped support for callbacks. They throw an error on purpose, can be seen here. You have to use async/await as shown in their example. – Palladium02 Commented Mar 2, 2023 at 13:41

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 2

MongoDB has removed callbacks from its Node.js driver as of version 5.0. See findOne.

If you really need to use callbacks instead of promises, you will need to use an older version of the driver.

I got the solution thanks to my friend @Sean. Instead of the callback function, I have to replace it with a .then() function:

app.get("/posts/:postId", function(req, res) {

  const requestedPostId = req.params.postId;

  Post.findOne({_id: requestedPostId}).then(post => {

    res.render("post", {

      title: post.title,

      content: post.content
    });
  });
});

In version 5.0, MongoDB has removed callbacks from its node.js driver. So now you can leverage the Promise instead of callback.

Updated Code:

Post.findOne({_id: requestedPostId}).then(post =>{
    res.render("post", {
      title: post.title,
      content: post.content
      });
    });

Also Refer: https://mongodb.github.io/node-mongodb-native/5.0/classes/Collection.html#findOne

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