Hi James,
substance_list is indeed the name of the view. I've now applied namespaces,
and added quotes around each URL statement, and it works! thanks!
What I do not understand is how it could have worked in the past.
Regards,
Vincent
On Monday, July 13, 2015 at 6:36:00 PM UTC+2, James Schneider wrote:
>
> 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] <javascript:>>
> 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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