sailsjs_waterline_mongodb_native.js

var Promise = require('bluebird');
var myType = 'mytype';
var nativePromise = new Promise(function (resolve, reject) {
  sails.models[mytype].native(function (err, collection) {
    if (err) {
      return reject(err);
    }
    var pipeline = []; //some pipeline

    collection.aggregate(pipeline).toArray(function (err, itemList) {
      if (err) {
        return reject(err);
      }
      var unserializedValues = [];
      itemList.forEach(function(value) {
          value = sails.models[mytype]._transformer.unserialize(value);
          unserializedValues.push(value);
      });

      return resolve(unserializedValues);
    })
  })
});

return nativePromise.then(function (itemList) {
  return Promise.map(itemList, function (item) {
    /**
     * Here's the part that does the main trick - returns my "native" item as Waterline object.
     */
    return new sails.models[mytype]._model(item);
  });
})