我试图在Django中将抽象用户模型中的布尔字段从False更改为True，但我做不到。

class User(AbstractUser):
    boolean = models.BooleanField(default=False)
    image = models.ImageField(default='default.jpg', upload_to='profile-pictures', blank=True, null=True)
    ...

    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)

        img = Image.open(self.image.path)

        if img.height > 300 or img.width > 300:
            output_size = (300, 300)
            img.thumbnail(output_size)
            img.save(self.image.path)

def View(request):
    user = request.user
    
    print(user.username)
    user.boolean is True
    print(user.is_vendor)
    user.save()

    return HttpResponseRedirect(reverse('profile'))