Django-grappelli admin: No reverse match error

Question

I've been working on a django project for a while now that uses grappelli for the admin and all of a sudden today my change_form.html template is throwing the following error:

Caught NoReverseMatch while rendering: Reverse for "grp_related_lookup" with arguments '()' and keyword arguments '{}' not found.

The offending line of code is line 38:

37    $.each(related_lookup_fields_fk, function() {
38        $("#id_" + this).grp_related_fk({lookup_url:"{% url grp_related_lookup %}"});
39    });

which is preceded by this bit of code:

var related_lookup_fields_fk = {% get_related_lookup_fields_fk adminform.model_admin %};

Obviously it's the {% url grp_related_lookup %} bit that's causing the problem.

I don't understand how the template is resolving grp_related_lookup to grappelli.views.related.related_lookup. I have tried replacing grp_related_lookup with grappelli.views.related.related_lookup and that didn't work either. Also, in the template the offending line looks like this:

$("#id_" + this).grp_related_fk({lookup_url:"{% url grp_related_lookup %}"});

but in the error message it looks like this:

$("#id_" + this).grp_related_fk({lookup_url:"{% url 'grp_related_lookup' %}"});

I don't know if the single quotes surrounding grp_related_lookup might have something to do with the problem or not. Is that how django rendered the function call? Is it passing the string 'grp_related_lookup' to the url template tag? If so, what might have caused this to break suddenly?

Some additional info:

• The value of related_lookup_fields is an empty list []. I am not defining any related_lookup_fields in my admin.py.
• I threw a couple debug statements into the grappelli.views.related.related_lookup view function and it doesn't appear to be getting called.
• I have not touched any of the templates recently.

Hopefully someone can point me in the right direction... Thanks!

Answer 1

Do you still have 'grappelli.urls' included in your URLconf? That the only reason I see that would cause this error. You can try using python manage.py shell:

from django.core.urlresolvers import reverse
print reverse('grp_related_lookup')

If this line returns the correct URL, you shouldn't get a NoReverseMatch in your template.

The quotes around grp_related_lookup shouldn't be a concern. The {% url %} tag accepts both quoted and unquoted strings as first argument, so django normalizes it to quoted strings. This behaviour is going to change in the future: you'll be able to pass template variables to {% url %} using unquoted strings. {% url foo %} and {% url "foo" %} won't give the same result, see the 1.3 release notes for details about this.

Answer 2

I encountered the same behavior with Django 1.5 and Grappelli 2.4.4.

To fix the problem I had to add

url(r'^grappelli/', include('grappelli.urls')),

to urlpatterns.

Answer 3

I faced with this problem today, when I tried to delete data in admin.Reverse for 'app_list' with arguments '()' and keyword arguments '{'app_label': ''}' not found.

I have put the url(r'^grappelli/', include('grappelli.urls')) in urls.py

The solution is pretty strange: just update the grappelli to the latest version. (I updated it from 2.5.6 to 2.6.3)

Answer 4

I faced this problem yesterday. The Django-grapelli I used was the one that was included in the FileBrowser installation. I solved the problem by upgrading Django-grapelli. Just type:

pip install --upgrade django-grappelli

Answer 5

I had a similar issue with urls and noticed that I need

{% load url from future %}

in the template if I want to have quoted url tags. That's also mentioned in the official django documentation: https://docs.djangoproject.com/en/1.3/ref/templates/builtins/#url

Answer 6

I seem to be encountering this same issue, but when I run the suggested console test I get this:

Python 2.7.9 (default, Apr  7 2015, 07:58:25)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from django.core.urlresolvers import reverse
>>> print reverse('grp_related_lookup')
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Users/tsantor/.virtualenvs/project_env/lib/python2.7/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 "/Users/tsantor/.virtualenvs/project_env/lib/python2.7/site-packages/django/core/urlresolvers.py", line 496, in _reverse_with_prefix
    (lookup_view_s, args, kwargs, len(patterns), patterns))
NoReverseMatch: Reverse for 'grp_related_lookup' with arguments '()' and keyword arguments '{}' not found. 0 pattern(s) tried: []

And my urls.py looks like this:

urlpatterns = patterns(

    # Admin
    url(r'^grappelli/', include('grappelli.urls')),
    url(r'^admin/', include(admin.site.urls), name="admin"),

    # main views
    #url(r'^$', RedirectView.as_view(url='/admin'), name='home'),

    # API
    url(r'^api/', include('api.urls', namespace='api')),
)

I also have the latest Grappelli (2.6.4) running on Django (1.8.2). By the way, it seems it only occurs when I try to access and add or edit view. The control panel and list views work.