How can i conditionally update one DB document using mongoose without referencing the document itself?

Question

for instance I have

  1 //for instance I have
  2 
  3 app.post('/update', validate, async (req, res) => {
  4   const {title, description, post_id} = req.body;
  5 
  6   // I need to update one of them if they exist
  7 
  8   if ((post_id && description) || title) {
  9     // Need to update ether title or description or both without
 10     try {
 11       const postBack = await Post.find({_id: post_id, user_id: req.user.id});
 12 
 13       const updated = await Post.updateOne(
 14         {_id: post_id, user_id: req.user.id},
 15         {
 16           title: title ? title : postBack[0].title,
 17           description: description ? description : postBack[0].description,
 18         },
 19       );
 20 
 21       res.send('Success');
 22 
 23       //How I can do the same but without Post.find()?
 24     } catch (err) {
 25       res.send(err);
 26     }
 27   } else {
 28     res.send('Error');
 29   }
 30 });
~          

How I can do the same but without Post.find()?

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Answer 1

Create an object for your update and only update the object if there is you have new data to set.

For example

const updateObj = {};
if (title) {
    updateObj.title = title;
}

if (description) {
    updateObj.description = description;
}

if (Object.keys(updateObj).length > 0 {
    const updated = await Post.updateOne({_id: post_id, user_id: req.user.id}, updateObj);
}