.populate('petType', {select: ['species']}) ("Ambiguous usage with singular model association")

Sails version: 1.1.0 Node version: 8.10 NPM version: 5.6.0 DB adapter name: sails-mysql DB adapter version: 1.0.1 Operating system: Debian GNU/Linux 8 (jessie)

/*Pet*/
module.exports = {
    attributes: {
      name: { type: 'string' },
      petType: {
        model: 'pettype'
      }
    }
}

/*PetType*/
module.exports = {
    attributes: {
      name: { type: 'string' },
    }
}

Then I try to populate my Pet model with specific PetType fields, like this:

await Pet.find().populate('petType', { select: ['name'] });

And I get the following error:

Could not populate petType because of ambiguous usage. This is a singular ("model") association, which means it never refers to more than one associated record. So passing in subcriteria (i.e. as the second argument to .populate()) is not supported for this association, since it generally wouldn't make any sense. But that's the trouble-- it looks like some sort of a subcriteria (or something) was provided!\n(Note that subcriterias consisting ONLY of omit or select are a special case that does make sense. This usage will be supported in a future version of Waterline.)\n\nHere's what was passed in:\n{ select: [ 'name' ] }