title: django 'str' object is not callable
body: <p>I have a problem creating an URL view in django. It gives me this error (ferrol is a Space object):</p>
  
  <pre><code>TypeError at /spaces/ferrol/
  'str' object is not callable
  Request Method: GET
  Request URL:    http://localhost:8000/spaces/ferrol/
  Django Version: 1.2.3
  Exception Type: TypeError
  Exception Value:    
  'str' object is not callable
  Exception Location: /usr/local/lib/python2.6/dist-packages/Django-1.2.3-py2.6.egg/django/core/handlers/base.py in get_response, line 100
  </code></pre>
  
  <p>Here is the code:</p>
  
  <p>spaces/models.py</p>
  
  <pre><code>class Space(models.Model):
  
  """
  Basic spaces model.
  """
  name = models.CharField(_('Name'), max_length=100, unique=True)
  description = models.TextField(_('Description'))
  date = models.DateTimeField(auto_now_add=True)
  
  logo = models.ImageField(upload_to='spaces/logos',
                           verbose_name=_('Logotype'))
  banner = models.ImageField(upload_to='spaces/banners',
                             verbose_name=_('Banner'))
  </code></pre>
  
  <p>Main urls.py</p>
  
  <pre><code>urlpatterns = patterns('',
  
  # Django administration
  (r'^admin/', include(admin.site.urls)),
  
  (r'^spaces/', include('apps.spaces.urls')),
  
  (r'^static/(?P&lt;path&gt;.*)$', 'django.views.static.serve',
      {'document_root': 'static'}),
  
  )
  
  if 'e_cidadania.apps.rosetta' in settings.INSTALLED_APPS:
  urlpatterns += patterns('',
      url(r'^rosetta/', include('apps.rosetta.urls')),
  )
  </code></pre>
  
  <p>spaces/urls.py</p>
  
  <pre><code>urlpatterns = patterns('',
      # Spaces
      (r'^(?P&lt;space_name&gt;[-\w\./\s]+)/', 'view_space_index'),
  )
  </code></pre>
  
  <p>spaces/views.py</p>
  
  <pre><code>def view_space_index(request, space_name):
  
  """
  Show the index page for the requested space.
  """
  place = get_object_or_404(Space, name=space_name)
  
  return object_detail(request,
                       queryset = Space.objects.all(),
                       object_id = place.id,
                       template_name = 'spaces/index.html',
                       template_object_name = 'get_place')
  </code></pre>