Question

先谢谢！
我在使用自定义类时遇到了问题，这里是代码：
类定义：

class BaseCompetition:
    def __init__(self, company):
        self.company = company
class SingleLeagueCompetition(Competition):
    def __init__(self, company):
    BaseCompetition.__init__(self,company)

使用时，如下：

test_company = Company.objects.get(id=1)
sample_single = SingleLeagueCompetition(test_company)

'公司'是一个模型但是在执行代码时遇到了错误，如下所示：
我只是不知道出了什么问题......

Traceback (most recent call last):
File "/Users/littlep/myWorks/python-works/sports_with_zeal/swz/dao.py", line 32, in __init__
self.company = company
File "/Users/littlep/.pythonbrew/pythons/Python-3.4.3/lib/python3.4/site-packages/django/db/models/fields/related.py", line 639, in __set__
if instance._state.db is None:
AttributeError: 'SingleLeagueCompetition' object has no attribute '_state'

再次感谢！

Answer 1

您的SingleLeagueCompetition课程应该继承BaseCompetition，如下所示：

class BaseCompetition:
    def __init__(self, company):
        self.company = company
class SingleLeagueCompetition(BaseCompetition):
    def __init__(self, company):
        super().__init__(company)

也可以通过使用父类BaseCompetition._init_来代替调用构造函数，您可以使用super将其绑定到子级中。

更多参考咨询：https://docs.python.org/3.4/library/functions.html#super

如何将模型实例分配给django中的类属性

1 个答案: