尝试根据登录用户的用户名创建Model对象时的ValueError

Question

AIM

我正在尝试创建一个Alarm对象，其中user字段设置为登录User的用户名。

问题与another question相同，我最近问过。但是，我重新构建了models.py和user=self.request.user.username现在返回下面所述的错误。

尽管我现在正在使用Django的默认用户模型，但self.request.user.username无法工作的原因是因为我还没有设置AUTH_USER_MODEL？

ERROR

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

CODE

models.朋友

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.朋友

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()

Answer 1

您必须提供用户实例，该实例可在qazxsw poi属性中找到。所以试试吧

request.user

You could do this also by reffering their

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

as,

id

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

异常提出，因为你将UNIQUE constraint failed字段定义为user到OneToOneField模型，这意味着每个User实例都与ATMOST一个用户相关。