Mongoose pre findOneAndUpdate hook issues

Question

I'm trying to update counts on a pre hook. The issue is that for some unknown reason the findOneAndUpdate hook doesn't have access to the document, as far as I can tell.

I would like to do this:

source.pre('findOneAndUpdate', function (next) {
  console.log('------------->>>>>> findOneAndUpdate: ');
  this.objects = this.objects || [];
  this.people = this.people || [];
  this.events = this.events || [];

  this.objectCount = this.objects.length;
  this.peopleCount = this.people.length;
  this.eventCount = this.events.length;

  next();
});

But for some reason the this in the hook isn't the document, its a Query object which seems about useless.

What am I missing? How do I use a pre hook to update counts on a findOneAndUpdate?

Answer 1

You can do smthng like that ->

source.pre('findOneAndUpdate', function (next) {
    console.log('------------->>>>>> findOneAndUpdate: ');
    this._update.$set.objects = [];
    this._update.$set.people = [];
    this._update.$set.events =  [];
    next();
});

pay attention to _update.$set because in the context "this" will be a query. So you can easily add anything you want!