这对我来说很奇怪。我正在Django信号接收器create_customer_settings
内设置一个断点来调试它。即使成功创建了新的ValueError
对象,应用程序也会抛出CustomerSettings
。当我尝试第二次创建它时,出现了UNIQUE约束错误,但这是因为已成功添加它。
为什么ValueError
时isinstance(this_user, User) == True
是
这是我可以安全捕获并忽略的错误吗?是因为CustomerSettings
ID与User
ID不同而引起的问题吗?
@receiver(post_save, sender=User)
def create_customer_settings(sender, instance, created, **kwargs):
if created:
this_user = User.objects.get(id=instance.id)
pdb.set_trace()
CustomerSettings.objects.create(
user=this_user,
email=this_user.email,
date_of_birth="1998-01-04",
in_private_mode=False
)
System check identified no issues (0 silenced).
October 29, 2018 - 23:42:57
Django version 2.1.1, using settings 'myapp.settings'
Starting development server at http://127.0.0.1:7000/
Quit the server with CONTROL-C.
> /src/myapp/myapp/models.py(36)create_customer_settings()
-> pdb.set_trace()
(Pdb) this_user
<User: new_user_8080>
(Pdb) isinstance(this_user, User)
True
(Pdb) CustomerSettings.objects.create(
user=this_user,
email=this_user.email,
date_of_birth="1998-01-04",
in_private_mode=False
)
*** ValueError: Cannot assign
"<CustomerSettings: CustomerSettings object (6)>":
"CustomerSettings.user" must be a "User" instance.
(Pdb) this_user.is_anonymous
False
(Pdb) this_user
<User: new_user_8080>
(Pdb) CustomerSettings.objects.create(
user=this_user,
email=this_user.email,
date_of_birth="1998-01-04",
in_private_mode=False
)
*** django.db.utils.IntegrityError:
UNIQUE constraint failed: myapp_customersettings.user_id
(Pdb) CustomerSettings.objects.all()
<QuerySet [<CustomerSettings: CustomerSettings object (1)>,
<CustomerSettings: CustomerSettings object (2)>,
<CustomerSettings: CustomerSettings object (3)>,
<CustomerSettings: CustomerSettings object (4)>,
<CustomerSettings: CustomerSettings object (5)>,
<CustomerSettings: CustomerSettings object (6)>]>
(Pdb) CustomerSettings.objects.all().values()
<QuerySet [
{'id': 1, 'user_id': 1, 'timezone': 'America/New_York', 'email':...
...
...
...
, {'id': 6, 'user_id': 15, 'timezone': '', 'email': 'new_user_8080@gmail.com',
'email_confirmed': False, 'date_of_birth': datetime.date(1998, 1, 4), 'first_name': '', 'last_name': '', 'in_private_mode': False}]>
(Pdb) CustomerSettings.objects.filter(user_id=15)
<QuerySet [<CustomerSettings: CustomerSettings object (6)>]>
(Pdb) CustomerSettings.objects.filter(user_id=15).values()
<QuerySet [{'id': 6, 'user_id': 15, 'timezone': '', 'email': 'new_user_8080@gmail.com', 'email_confirmed': False, 'date_of_birth': datetime.date(1998, 1, 4), 'first_name': '', 'last_name': '', 'in_private_mode': False}]>
(Pdb) CustomerSettings.objects.filter(user_id=15).values()[0]
{'id': 6, 'user_id': 15, 'timezone': '', 'email': 'new_user_8080@gmail.com', 'email_confirmed': False, 'date_of_birth': datetime.date(1998, 1, 4), 'first_name': '', 'last_name': '', 'in_private_mode': False}
(Pdb) CustomerSettings.objects.filter(user_id=15).values()[0]['id']
6
(Pdb) User.objects.get(id=15)
<User: new_user_8080>
(Pdb)
CustomerSettings
型号:class CustomerSettings(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE, unique=True, null=False, blank=False)
timezone = models.CharField(max_length=50, choices=TIMEZONE_CHOICES, blank=False, null=False)
email = models.EmailField(
verbose_name='email address',
max_length=255, blank=False, null=False,
unique=True)
email_confirmed = models.BooleanField(default=False)
date_of_birth = models.DateField()
first_name = models.CharField(max_length=50, null=False, blank=False)
last_name = models.CharField(max_length=50, null=False, blank=False)
in_private_mode = models.BooleanField()
答案 0 :(得分:1)
再次检查您发布的代码是否正在运行。错误消息ValueError: Cannot assign "<CustomerSettings: CustomerSettings object (6)>": "CustomerSettings.user" must be a "User" instance
表示您正在尝试创建CustomerSettings
属性为user
且ID为6的实例的CustomerSettings
实例。
我的猜测是,您所运行的内容与发布的内容之间存在脱节。如果没有,则调用create_customer_settings
,其中instance
参数是CustomerSettings
的实例。
答案 1 :(得分:0)
我仔细回顾了回溯。 update_customer_settings
事件CustomerSettings
成功创建post_save
模型后,正在调用先前为User
工作的方法,在这种情况下,实例确实是CustomerSettings
。
对此我感到抱歉。你们都为我指明了正确的方向,谢谢。我需要以一种截然不同的方式来处理这个问题。
File "/Users/my_folder/my_app/my_app/models.py", line 44, in update_customer_settings
CustomerSettings.objects.create(user=instance)
ValueError: Cannot assign "<CustomerSettings: CustomerSettings object (14)>": "CustomerSettings.user" must be a "User" instance.
@receiver(post_save, sender=CustomerSettings)
def update_customer_settings(sender, instance, created, **kwargs):
if created:
CustomerSettings.objects.create(user=instance)
instance.customersettings.save()