python - 错误 : no attribute '_state'

Question

我有一个模型:

class User(models.Model):

    user_id = models.IntegerField(default=0)
    user_name = models.CharField(max_length=20)
    user_age = models.IntegerField(default=0)

    def __init__(self, user_id, user_name, user_age):
        self.user_id = user_id
        self.user_name = user_name
        self.user_age = user_age

然后我尝试创建这个模型的一个实例:

new_user = User(0, 'Andrew', 25)
new_user.save()

但这给了我错误:

'User' object has no attribute '_state'

这是什么意思？

Answer 1

代码缺少对父类(super class)的调用'__init__:

def __init__(self, user_id, user_name, user_age):
    super(User, self).__init__() # <----
    self.user_id = user_id
    self.user_name = user_name
    self.user_age = user_age