Question

Model:

class Car(models.Model):
    name = models.CharField(max_length=10, unique=True)
    def __unicode__(self):
            return self.name
    def get_absolute_url(self):
        return reverse('cars.views.car', args=[str(self.id)])

View:

def car(request):
    all_cars = Car.objects.all().filter(active=1).values('id', 'name')
    return render(request, 'car.html', {'all_cars': all_cars})

URL mapping:

url(r'^car/$', 'cars.views.car'),

in car.html, I’m using:

<li><a href="{{ car.get_absolute_url }}">{{ car.name }}</a></li>

But it didn’t print /car/N/, only /car/. How to fix it? With this (<!-- BAD template code. Avoid! -->) it works, but dont works with get_absolute_url.

Answer 1

Your URL pattern doesn’t accept any argument, so django can’t generate an URL with the argument!

url(r'^car/$', 'cars.views.car'), # Where would django add the parameter?!

Should be:

url(r'^car/(?P<car_id>\d+)/$', 'cars.views.car'),

But then your car view wouldn’t work, because it looks like it gives a listing of cars.

You probably want two URLS: one for a car listing, and one for a specific car. They’ll need to map to two different views:

url(r'^car/$', 'cars.views.list_cars'), # List of all cars.
url(r'^car/(?P<car_id>\d+)/$', 'cars.views.view_car'), # View a specific car, map get_aboluste_url to this view. 

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On a sidenote, you should look into generic views, they would make this entire process simpler.