What is the value being given to substance_list in your template context?
It looks like it may be empty.
Unless 'substance_list' is the actual name of the view? In which case you
probably need to add quotes around it in your URL tag:
{% url 'substance_list' %}
As is it is, the template is reading substance_list as a variable. If it is
the name, and not a variable, I would suggest looking into Django URL name
spaces, which are much easier to diagnose and maintain, and avoid the
missing quote issue since there can never be a variable name containing the
: character. For example,
{% url 'substance:list' %}
Is much less vague than 'substance_list' since the : version wouldn't also
work as a variable name, making it easier to figure out that you want the
name of a URL and not a variable name.
https://docs.djangoproject.com/en/1.8/topics/http/urls/#url-namespaces
-James
On Jul 13, 2015 7:27 AM, "Vincent" <[email protected]> wrote:
> Hi everyone,
>
> I've started working on an application after some trime, but I can not get
> it to run again.
>
> I've got this error:
>
> Reverse for '' with arguments '()' and keyword arguments '{}' not found.
> 0 pattern(s) tried: []
> Internal Server Error: /substances/
> Traceback (most recent call last):
> File "C:\Python27\lib\site-packages\django\core\handlers\base.py", line
> 164, in get_response
> response = response.render()
> File "C:\Python27\lib\site-packages\django\template\response.py", line
> 158, in render
> self.content = self.rendered_content
> File "C:\Python27\lib\site-packages\django\template\response.py", line
> 135, in rendered_content
> content = template.render(context, self._request)
> File "C:\Python27\lib\site-packages\django\template\backends\django.py",
> line 74, in render
> return self.template.render(context)
> File "C:\Python27\lib\site-packages\django\template\base.py", line 209,
> in render
> return self._render(context)
> File "C:\Python27\lib\site-packages\django\template\base.py", line 201,
> in _render
> return self.nodelist.render(context)
> File "C:\Python27\lib\site-packages\django\template\base.py", line 903,
> in render
> bit = self.render_node(node, context)
> File "C:\Python27\lib\site-packages\django\template\debug.py", line 79,
> in render_node
> return node.render(context)
> File "C:\Python27\lib\site-packages\django\template\loader_tags.py",
> line 135, in render
> return compiled_parent._render(context)
> File "C:\Python27\lib\site-packages\django\template\base.py", line 201,
> in _render
> return self.nodelist.render(context)
> File "C:\Python27\lib\site-packages\django\template\base.py", line 903,
> in render
> bit = self.render_node(node, context)
> File "C:\Python27\lib\site-packages\django\template\debug.py", line 79,
> in render_node
> return node.render(context)
> File "C:\Python27\lib\site-packages\django\template\defaulttags.py",
> line 329, in render
> return nodelist.render(context)
> File "C:\Python27\lib\site-packages\django\template\base.py", line 903,
> in render
> bit = self.render_node(node, context)
> File "C:\Python27\lib\site-packages\django\template\debug.py", line 79,
> in render_node
> return node.render(context)
> File "C:\Python27\lib\site-packages\django\template\defaulttags.py",
> line 507, in render
> six.reraise(*exc_info)
> File "C:\Python27\lib\site-packages\django\template\defaulttags.py",
> line 493, in render
> url = reverse(view_name, args=args, kwargs=kwargs, current_app=
> current_app)
> File "C:\Python27\lib\site-packages\django\core\urlresolvers.py", line
> 579, in reverse
> return force_text(iri_to_uri(resolver._reverse_with_prefix(view,
> prefix, *args, **kwargs)))
> File "C:\Python27\lib\site-packages\django\core\urlresolvers.py", line
> 496, in _reverse_with_prefix
> (lookup_view_s, args, kwargs, len(patterns), patterns))
> NoReverseMatch: Reverse for '' with arguments '()' and keyword arguments
> '{}' not found. 0 pattern(s) tried: []
> [13/Jul/2015 15:32:02]"GET /substances/ HTTP/1.1" 500 185051
>
> It happens when it encounters the first reverse lookup:
>
> <li><a href=" {% url substance_list %} ">Stubstances</a></li>
>
> I've traced it down to the render method in the URLNode class (in
> defaulttags), where
>
> view_name = self.view_name.resolve(context)
>
> returns an empty string.
>
> I have the following URL configurations
>
> site urls.py:
> urlpatterns = (
> url(r'^$', lambda r : HttpResponseRedirect('substances/')),
> url(r'^norights/', TemplateView.as_view(template_name="norights.html"
> ), name="norights"),
> url(r'^substances/', include('substances.urls')),
> url(r'^suppliers/', include('suppliers.urls')),
> url(r'^users/', include('users.urls')),
> url(r'^sources/', include('sources.urls')),
> url(r'^media/(.*)$', 'django.views.static.serve', {'document_root' :
> settings.MEDIA_ROOT}, name="media"),
> )
>
> app urls.py
> urlpatterns = (
> url(r'^$', SubstanceListView.as_view(), name =
> 'substance_list'),
> url(r'^create$', SubstanceCreateView.as_view(), name =
> 'substance_create'),
> url(r'^update/(?P<pk>\d+)$', SubstanceUpdateView.as_view(), name =
> 'substance_update'),
> url(r'^detail/(?P<pk>\d+)$', SubstanceDetailView.as_view(), name =
> 'substance_detail'),
> url(r'^mutate/(?P<pk>\d+)$', SubstanceMutateView.as_view(), name =
> 'substance_mutate'),
> url(r'^delete/(?P<pk>\d+)$', SubstanceDeleteView.as_view(), name =
> 'substance_delete'),
>
> url(r'^mutate_check_ajax/(?P<pk>\d+)$', mutate_check_ajax, name =
> 'mutate_check_ajax'),
> url(r'^component_check_ajax$', component_check_ajax, name =
> 'component_check_ajax'),
> url(r'^supplier_check_ajax$', supplier_check_ajax, name =
> 'supplier_check_ajax'),
> url(r'^report', substance_report, name =
> 'substance_report'),
> url(r'^worksheet/(?P<pk>\d+)$', substance_worksheet, name =
> 'substance_worksheet')
> )
>
> Oddly enough I did not change anything to get the error. Afterwards I
> upgraded to Django 1.8.3, but that did not matter.
>
>
>
> Thanks,
> Vincent
>
>
>
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