That particular syntax works in Django 1.4, did you do an upgrade?
-James
On Jul 13, 2015 11:52 PM, "Vincent" <[email protected]> wrote:
> 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]> 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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