@property
    def num_items(self):
        num_items = 0
        for line in self.lines.all():
            num_items += line.quantity
        return num_items
Given a _ConnectionRecord, return it to the :class:`.Pool`.
dataset/ETHPy150Open django-oscar/django-oscar/src/oscar/apps/order/abstract_models.py/AbstractOrder.num_items--crossover with--dataset/ETHPy150Open goFrendiAsgard/kokoropy/kokoropy/packages/sqlalchemy/pool.py/Pool._return_conn