#urls.py

urlpatterns = patterns('',
    # Example:
    # (r'^camperone/', include('camperone.foo.urls')),

    # Uncomment the admin/doc line below and add 'django.contrib.admindocs'
    # to INSTALLED_APPS to enable admin documentation:
    (r'^admin/doc/', include('django.contrib.admindocs.urls')),

    # Uncomment the next line to enable the admin:
    (r'^admin/', include(admin.site.urls)),
    (r'^', include('cms.urls')),
    (r'^grappelli/', include('grappelli.urls')),
    (r'^usato/(\d+)/', "camper.views.usato"),
#    (r'^admin/form_designer/', include('form_designer.admin_urls')),
#    (r'^forms/', include('form_designer.urls')),
)

#models.py

class Usato(models.Model):
    modello = models.ForeignKey(Modelli)
    km_percorsi = models.IntegerField()
    accessori = models.ManyToManyField(Accessori)
    anno_immatricolaz = models.IntegerField()
    note = models.TextField(max_length=500)
    prezzo = models.FloatField()
    def __unicode__(self):
        return u"%s" % (self.modello)
    def get_menu_title(self):
        return self.name

    def get_absolute_url(self):
        return reverse('usato', args=[self.pk])

    class Meta:
        verbose_name = "Camper Usato"
        verbose_name_plural = "Camper Usati"

#utils.py
from camper.models import Usato

def get_usati(request):
    usati = list(Usato.objects.all())
    res = []

    for usato in usati:
        res.append(usato)
    return res

#settings.py

CMS_NAVIGATION_EXTENDERS = (
#    ('cmsplugin_news.navigation.get_nodes','News navigation'),
    ('camper.utils.get_usati','Camper usati'),
)