Почему возникает ошибка 404 при использовании get_absolute_url?

Question

[PyChan]

В models.py:

class Items(models.Model):
    id = AutoField(primary_key=True)
    name = CharField(max_length=150)
    date = DateField(default=timezone.now())
    marks = ForeignKey(Marks, on_delete=models.DO_NOTHING, null=True)
    category = ForeignKey(Cats, on_delete=models.DO_NOTHING, null=True)
    price = DecimalField(max_digits=7, decimal_places=2)
    previous_price = DecimalField(max_digits=7, decimal_places=2, null=True)
    article_number = CharField(max_length=150)
    description = TextField(null=True)
    picture = TextField(null=True)
    video = TextField(null=True)
    objects = models.Manager()

    def get_absolute_url(self):
        return "/item/%i/" % self.id

в urls.py:

urlpatterns = [path('', views.index, name='index'), path('add_item/<int:id>', views.add_item, name='add_item'),
               path('register', views.add_user, name='register'), path('item/<int:id>', views.item, name='item')]

В views.py:

def item(request, id):
    context = {'cats_nav': Cats.objects.filter(location='nav'), 'objects': Items.objects.get(id=id)}
    return render(request, 'index.html', context)

При переходе по адресу item/1 воникает ошибка. Почему так?