I get stuck on a « NoReverseMatch » exception with a reverse.
Reverse for 'notifications_read' with arguments '()' and keyword arguments '{'id': None}' not found. 1 pattern(s) tried: ['notifications/read/(?P\d+)/$']
I’m trying to check when notifications are read on comments. Basically, I’ve got this so far:
url.py:
url(r'^notifications/read/(?P<id>\d+)/$', notifications.views.read, name='notifications_read')
And the problem seems to occur in the class Notification, in the str(self) method of:
notifications/models.py
context = {
"sender": self.sender_object,
"verb": self.verb,
"target": self.target_object,
"action": self.action_object,
"verified_read": reverse('notifications_read', kwargs={"id": self.id}),
"target_url": target_url,
}
return "{sender} {verb} <a href='{verified_read}?next={target_url}'>{target}</a> with {action}.".format(**context)
I can’t figure out why self.id is None which seems to be the problem, since when I take it off in the URL pattern, as well as the kwargs in the reverse, I don’t get the exception (but neither the needed URL).
If I put str(self.id) as:
reverse('notifications_read', kwargs={'id': str(self.id)})
with
url(r'^notifications/read/(?P<id>[\w-]+)/$', notifications.views.read, name='notifications_read')
there is no exception but the rendering is /notifications/read/None/
I know there are lots of similar questions out there like Reverse for '*' with arguments '()' and keyword arguments '{}' not found
But in none of them, there seem to be this problem with self.id returning None.
I’m using Django 1.9.2 with python 3.5
Could you help? It would be really appreciated. Thanks a lot!
If it can be helpful, the exception is also not occurring when I comment those lines:
In comments/views.py
notify.send(
request.user,
action=new_comment,
target=parent_comment,
recipient=parent_comment.user,
verb="replied to"
)
And here is the corresponding view in notifications/views.py:
@login_required
def read(request, id):
try:
next = request.GET.get('next', None)
notifications = Notification.objects.get(id=id)
if notifications.recipient == request.user:
notifications.read = True
notifications.save()
if next is not None:
return HttpResponseRedirect(next)
else:
return HttpResponseRedirect(reverse("notifications_all"))
else:
raise Http404
except:
raise HttpResponseRedirect(reverse("notifications_all"))
On the debug page, I get:
Request Method: POST
Request URL: http://0.0.0.0:8000/comment/create/
Django Version: 1.9.2
Exception Type: NoReverseMatch
Exception Value: Reverse for 'notifications_read' with arguments '()' and keyword arguments '{'id': None}' not found. 1 pattern(s) tried: ['notifications/read/(?P<id>\\d+)/$']
Exception Location: /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/django/core/urlresolvers.py in _reverse_with_prefix, line 508
Python Executable:/Library/Frameworks/Python.framework/Versions/3.5/bin/python3
Python Version:3.5.0
EDIT 2 (full Traceback):
Environment:
Request Method: POST
Request URL: http://0.0.0.0:8000/comment/create/
Django Version: 1.9.2
Python Version: 3.5.0
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'crispy_forms',
'accounts',
'comments',
'notifications',
'videos']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']
Traceback:
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response
149. response = self.process_exception_by_middleware(e, request)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response
147. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/leomaltrait/PycharmProjects/srvup/src/comments/views.py" in comment_create_view
80. verb="commented on"
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/django/dispatch/dispatcher.py" in send
192. response = receiver(signal=self, sender=sender, **named)
File "/Users/leomaltrait/PycharmProjects/srvup/src/notifications/models.py" in new_notification
157. print(new_note)
File "/Users/leomaltrait/PycharmProjects/srvup/src/notifications/models.py" in __str__
95. "verified_read": reverse('notifications_read', kwargs={"id": self.id}),
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/django/core/urlresolvers.py" in reverse
600. return force_text(iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)))
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/django/core/urlresolvers.py" in _reverse_with_prefix
508. (lookup_view_s, args, kwargs, len(patterns), patterns))
Exception Type: NoReverseMatch at /comment/create/
Exception Value: Reverse for 'notifications_read' with arguments '()' and keyword arguments '{'id': None}' not found. 1 pattern(s) tried: ['notifications/read/(?P<id>\\d+)/$']
