ValueError: Cannot assign object user must be a "User" instance

Question

This is very strange to me. I am setting a breakpoint inside of a Django signal receiver create_customer_settings to debug this. The app is throwing a ValueError even though the new CustomerSettings object is successfully created. When I try to create it for a second time, I get a UNIQUE constraint error, but that is because it was already added successfully.

Why the ValueError when isinstance(this_user, User) == True?

Is this an error I can safely catch and ignore? Is it a problem because the CustomerSettings id is different than the User id?

create_customer_settings

@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
    )

pdb.set_trace() output 1:

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.set_trace() output 2:

(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': '[email protected]', 
'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': '[email protected]', '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': '[email protected]', '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` Model:

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()

i think you are trying to create a CustomerSettings just after instance created, try to direct assign CustomerSettings.objects.create( user=instance, email=instance.email, date_of_birth="1998-01-04", in_private_mode=False ) — Pankaj Sharma
– Pankaj Sharma, Commented Oct 30, 2018 at 1:10
To be clear, the sender is user. I got an error trying to assign directly. I'll try again tomorrow. — Scott Skiles
– Scott Skiles, Commented Oct 30, 2018 at 2:46
Have you got a custom User class perhaps? Are you sure the OneToOneField references the same User class that you have in that signal? — Daniel Roseman
– Daniel Roseman, Commented Oct 30, 2018 at 8:04
Yes, I did have a custom user class previously built that was floating around in models, but was not used in the signal. I commented it out, and I'm still getting the error: Exception Type: ValueError Exception Value: Cannot assign "<CustomerSettings: CustomerSettings object (11)>": "CustomerSettings.user" must be a "User" instance. — Scott Skiles
– Scott Skiles, Commented Oct 30, 2018 at 10:42
@PankajSharma - This did not work either. (Pdb) this_user <User: new_user_2020> (Pdb) this_user[0] *** TypeError: 'User' object does not support indexing (Pdb) this_user == instance True (Pdb) CustomerSettings.objects.create(user=instance, email=instance.email, date_of_birth="1998-01-04", in_private_mode=False) *** ValueError: Cannot assign "<CustomerSettings: CustomerSettings object (13)>": "CustomerSettings.user" must be a "User" instance. (Pdb) — Scott Skiles
– Scott Skiles, Commented Oct 30, 2018 at 10:46

schillingt · Accepted Answer · 2018-10-30 01:31:25Z

1

Double check that the code you posted is what you have running. The error message ValueError: Cannot assign "<CustomerSettings: CustomerSettings object (6)>": "CustomerSettings.user" must be a "User" instance means that you're attempting to create a CustomerSettings instance where the user property has the instance of CustomerSettings that's id is 6.

My guess is there's a disconnect between what you have running and what you posted. If there isn't, then something is calling create_customer_settings where the instance argument being an instance of CustomerSettings.

answered Oct 30, 2018 at 1:31

schillingt

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2 Comments

Scott Skiles Over a year ago

Thanks. Code is direct from console, and I made sure to double check not to waste anyone's time. Appreciate the answer

Scott Skiles Over a year ago

Made sure to include this: -> pdb.set_trace() (Pdb) this_user <User: new_user_8080> (Pdb) isinstance(this_user, User) True

Scott Skiles · Accepted Answer · 2018-10-30 11:02:31Z

0

I took a long and hard look at the traceback. A method that was working previously, for update_customer_settings, was being called after the successful creation of the CustomerSettings model after the post_save event by User, which in that case the instance was indeed CustomerSettings.

I apologize for the confusion. You were all pointing me in the right direction, thank you. I need to handle this in a much different way.

traceback

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.

update_customer_settings

@receiver(post_save, sender=CustomerSettings)
def update_customer_settings(sender, instance, created, **kwargs):
    if created:
        CustomerSettings.objects.create(user=instance)
    instance.customersettings.save()

answered Oct 30, 2018 at 11:02

Scott Skiles

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1 Comment

schillingt Over a year ago

Glad you were able to figure it out!

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ValueError: Cannot assign object user must be a "User" instance

create_customer_settings

pdb.set_trace() output 1:

pdb.set_trace() output 2:

`CustomerSettings` Model:

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create_customer_settings

pdb.set_trace() output 1:

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CustomerSettings Model:

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`CustomerSettings` Model: