Model.update Validators: No access to "this", specifically in subschemas

Using this in my validators works for document validation, but breaks (throws errors) on query validation.

Is there an option I’m not aware of that would help me achieve this?

My root issue is that I want to mutually validate 2 fields against each other, and had been using this as a way to access each of them.

var schema = new Schema({
  smaller: {type: Number, validate: validateRelative},
  larger: {type: Number, validate: validateRelative}
}, {_id: false});

function validateRelative(val, done) {
  // Works for document validation, 
  // but throws (this not defined) on query (update) validation
  if(this.smaller > this.larger) {
    return done(false, "`larger` must be greater than `smaller`");
  }

  return done;
}

Another alternative I could think of, but couldn’t figure out how to implement would be defining “root” validation on my schema, e.g.:

// Is there a way to do this??
schema.path(/* root */).validate(validateRelative);

function validateRelative(subDoc, done) {
  if(subDoc.smaller > subDoc.larger) {
    return done(false, "Path `larger` must be greater than path `smaller`");
  }

  return done;
}

[vkarpov15]

Fixed, see http://mongoosejs.com/docs/validation.html#update-validators-and-this . Looks like our docs build was broken.

[vkarpov15]

Thanks for pointing that out, fixed.