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pythondjangowebreverse

Django NoReverseMatch at / with arguments '('',)'

I have:

path('new/', views.new, name='new_without_arg'),
path('new/<str:arg>', views.new_with_arg, name='new_with_arg')

in my urls.py and when I have 'new_with_arg' in a template:

<a href="{% url 'new_with_arg' subject %}">New Subject</a>

I get:

Reverse for 'new_with_arg' with arguments '('',)' not found. 1 pattern(s) tried: ['new/(?P[^/]+)$']

My views.py is:


def new(request):
    return render(request, 'notes/new.html')

def new_with_arg(request, arg):

    if(arg == 'task'):
        return render(request, 'notes/new_task.html')

    elif(arg == 'room'):
        return render(request, 'notes/new_room.html')

    elif(arg == 'subject'):
        return render(request, 'notes/new_subject.html')
    
    else:
        return HttpResponseRedirect(reverse('new_without_arg'))
Solution

  • I got it, it had to be:

    <a href="{% url 'new_with_arg' 'subject' %}">New Subject</a>