sailsCallback.js

destroy: function(req, res) {
  var id = req.param('id');

  MyModel.findOne(id)
  .exec(function foundRecord (err, record) {
    if (err) return res.serverError(err);
    if(!record) return res.notFound('No record found with the specified `id`.');
    MyModel.destroy(id)
    .exec(function(err) {
      if (err) return res.negotiate(err);
      return res.ok(record);
   });
  });
}