How to perform operation on subdocuments without fetching a parent in Mongoose?

Question

For now in case I want to remove a subdocument I do this:

Post.findById(post_id).exec(function(err, post) {
  post.comments.remove({'_id': comment_id});
  post.save(function(err) {
    res.end("Hooray!");
  });
});

Which seem to be non-optimal to me, because each time I remove a comment the whole post will be fetched from DB and it has a lot of stuff attached to it. So, is it possible to modify subdocuments without fetching a parent document?

Answer 1

According to documentation if you want to update document without fetching it, you have to perform update request manually. In my case it will result in this code:

Post.update({'_id': post_id}, {$pull: {'comments': {'_id': comment_id}}}).exec(function(err){
  console.log('Hooray!');
});

It is a good workable solution, but performing direct request means that validations wouldn't work as well as versioning.