def connect(self): 
        try:
            self.connection = pymongo.Connection(self.host, self.port)
            self.db = self.connection[self.name]
        except AutoReconnect:
            raise DatabaseException("It's not possible connect to the database")
def serializable_fields(self):
        """ in certain cases the user model isn't serializable so you may want to only send the id """
        return self