Save a list of new models and attach them to the parent model

        :type models: list
        :type joinings: dict

        :rtype: list

def save_many(self, models, joinings=None):
        """
        Save a list of new models and attach them to the parent model

        :type models: list
        :type joinings: dict

        :rtype: list
        """
        if joinings is None:
            joinings = {}

        for key, model in enumerate(models):
            self.save(model, joinings.get(key), False)

        self.touch_if_touching()

        return models