python之错误 : no attribute '_state'

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？

请您参考如下方法:

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