Hi. I started using promises all over my code because it makes the code look beautiful. I really like this library but the problem is that errors are returned as Object not as instanceof some ValidationError class.

What I would propose is to wrap errors into validate.ValidationError class where you can still get an object calling toObject() method thus everything works the same way we just add a better support for promises.

Example:

  validate.async(req.body, contraints).then(function() {
    return Model.save(req.body);
  }).then(function(result) {
    res.status(201).json(result);
  }).catch(validate.ValidationError, function(err) {
    res.status(422).json(err);
  }).catch(function(err) {
    res.status(500).json(err);
  });

I would appreciate if we can do this small update. Thanks!