benjamingr/gist:8887343

## gistfile1.txt
Entity._save = Promise.promisify(Item.prototype.save);

Entity.prototype._create = Promise.method(function(itemData) {
  if (!this.Model) throw new Error('No Mongoose.Model defined, use setModel()');
  var item = new this.Model(itemData);
  return Entity._save.apply(item);
});
	Entity._save = Promise.promisify(Item.prototype.save);

	Entity.prototype._create = Promise.method(function(itemData) {
	if (!this.Model) throw new Error('No Mongoose.Model defined, use setModel()');
	var item = new this.Model(itemData);
	return Entity._save.apply(item);
	});