ValueError when attempting to create Model object based on username for logged in User

Question

AIM

I am attempting to create an Alarm object with the user field set as the username for the logged in User.

The issue identical to another question I asked recently. However, I restructured models.py and user=self.request.user.username is now returning the error stated below.

Despite the fact that I am now using Django's default User model, is the reason why self.request.user.username isn't working is because I haven't set up AUTH_USER_MODEL?

ERROR

ValueError: Cannot assign "'sam_jones'": "Alarm.user" must be a "User" instance.

CODE

Models.py

class Alarm(models.Model):
    """ Model representing each Alarm """
    alarm_id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    timezone = models.CharField(max_length=30)
    city = models.CharField(max_length=30)
    country = models.CharField(max_length=30)
    time = models.DateTimeField()
    temp_conditional = models.BooleanField()
    surf_conditional = models.BooleanField()
    temp_max = models.FloatField(blank=True, null=True)
    temp_min = models.FloatField(blank=True, null=True)
    surf_max = models.FloatField(blank=True, null=True)
    surf_min = models.FloatField(blank=True, null=True)

    def __str__(self):
        return str(self.alarm_id)

Views.py

class AlarmCreateView(LoginRequiredMixin, CreateView):
    """ CreateView for User to create the Alarm object """
    model = Alarm
    ...

    def form_valid(self, form):
        self.get_user_location(request, form)
        return super().form_valid(form)

    def get_user_location(self, request, form):
        """ Function to get Profile's location from IP and create Alarm object """
        ...
        alarm_object = Alarm.objects.create(
            alarm_id=uuid.uuid4(),
            user=self.request.user.username,
            ...
        )
        alarm_object.save()

Try using self.request.user instead of self.request.user.username — Gopal Kildoliya, Aug 09 '18 at 06:09
I have tried `self.request.user` and get the following error: `UNIQUE constraint failed: weather_alarm_alarm.user_id`. — Darcy, Aug 09 '18 at 06:14

JPG · Accepted Answer · 2018-08-09T06:22:23.370

You have to provide User instance, which is avalibale on request.user attribute. So try this

alarm_object = Alarm.objects.create(
            alarm_id=uuid.uuid4(),
            user=self.request.user,
            ...
        )

You could do this also by reffering their id as,

alarm_object = Alarm.objects.create(
            alarm_id=uuid.uuid4(),
            user=self.request.user.id,
            ...
        )

UNIQUE constraint failed exception raised because you defined user field as OneToOneField to User model, which means For every Alarm instance are related to ATMOST one User.

ValueError when attempting to create Model object based on username for logged in User

AIM

ERROR

CODE

1 Answers1