Question 115373 in Mongodb Question posted in
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Mongodb – MongooseError: Model.findOne() no longer accepts a callback

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?

Tags:

3

Answers


  1. Chosen as BEST ANSWER
    0

    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
    });
  });
});

  2. 0

    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.

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  3. 0

    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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