I'm doing the effectivedjango tutorial, but I ran into a problem: While using `get_absolute_url`, it does not add the id to the HTML code (see the bottom of [this](http://effectivedjango.com/tutorial/additional-views.html) page). I have tried to find my error and looked up the passage in the Django docs. According to that, I seem to do fine. I tried to understand the other questions about `get_absolute_url` on the forum as well but if I understood, it did not turn out to solve the issue. I also looked up the information about `kwargs` to check my syntax, but could not find a mistake. 

This is all the related code (as it seems):

models.py:

```
from django.db import models
from django.core.urlresolvers import reverse

class Contact(models.Model):
    first_name = models.CharField(max_length=255)
    last_name = models.CharField(max_length=255)
    email = models.EmailField()

    def __str__(self):
        return ' '.join([
            self.first_name,
            self.last_name,
        ])

    def get_absolute_url(self):
        return reverse('contacts-view', kwargs={'pk': self.id})

```

`urls.py`:

```
url(r'^(?P<pk>\d+)/$', contacts.views.ContactView.as_view(), name='contacts-view',),

```

`views.py`:

```
class ContactView(DetailView):
    model = Contact
    template_name = 'contact.html'

```

`contact_list.html`:

```
<ul>
  {% for contact in object_list %}
    <li class="contact">
      <a href="{{ contact.get_absolute_url }}"> {{contact}}</a>
      (<a href="{% url 'contacts-edit' pk=contact.id %}" >edit</a>)
      (<a href="{% url 'contacts-delete' pk=contact.id %}">delete</a>)<br>
    </li>
  {% endfor %}
</ul>

```

Now, I am expecting a `1` after the first `href` in the generated source of the `contact_list` HTML file, which is missing (just a section):

```
<li class="contact">
    <a href=""> Maaike van der Vlies</a>
    (<a href="/edit/1/" >edit</a>)
    (<a href="/delete/1/">delete</a>)<br>
</li>

```

What am I doing wrong? Should I not expect the `1` or is there some other thing I am missing?