NoReverseMatch at / Reverse for 'add_time_slot' with arguments '('',)' not found. 1 pattern(s) tried: ['add_time_slot/(?P<turf_id>[0-9]+)/\\Z']

Question

I getting an error while doing python django project.

The error:

'NoReverseMatch at /
Reverse for 'add_time_slot' with arguments '('',)' not found. 1 pattern(s) tried: ['add_time_slot/(?P<turf_id>[0-9]+)/\\Z']'. 
Several things i tried but nothing works please help me...

view.py

def add_time_slot(request, turf_id):
    turf = Venue.objects.get(pk=turf_id)
    if request.method == 'POST':
        form = TimeSlotForm(request.POST)
        if form.is_valid():
            timeslot = form.save(commit=False)
            timeslot.turf = turf
            timeslot.save()
            return redirect('add_time_slot', turf_id=turf_id)
    else:
        form = TimeSlotForm()
    return render(request, 'add_time_slot.html', {'form': form, 'turf': turf})

url.py

path('add_time_slot/<int:turf_id>/', views.add_time_slot, name='add_time_slot'),

html

<a class="nav-link" href="{% url 'add_time_slot' turf_id %}">Add Time Slots</a>

Answer 1

The encountered error suggests that the turf_id argument provided to the {% url 'add_time_slot' turf_id %} template tag is either empty or invalid. To troubleshoot, verify that turf_id is a valid variable within your template. Confirm its presence in the context by checking the view responsible for rendering the template. The view should return a render statement similar to the one below:

return render(request, 'html_raising_no_reverse_match.html', {'turf_id': turf.pk})

Ensure that the turf_id is correctly passed to the template context so that it can be utilised in generating the URL. This verification step should help resolve the issue with the reverse match error.

Additionally, in your view, you might want to add some error handling for the case when the Venue with the specified turf_id is not found. If the Venue does not exist, it could result in a DoesNotExist exception. Using turf = get_object_or_404(Venue, pk=turf_id) instead of turf = Venue.objects.get(pk=turf_id) helps to handle the case when the specified Venue does not exist, returning a 404 response instead of raising a DoesNotExist exception.