django delete post noReverseMatch

Trying to delete a post, but somehow getting a NoReverseMatch

views.py

@login_required
def task_detail(request, slug):
    '''
    Detailed view of all tasks on given project
    '''
    context = {}
    checklist   = get_object_or_404(Checklist, slug=slug)
    context.update({'checklist':checklist})
    form        = NotesForm(request.POST or None)
    if request.method == "POST":
        if form.is_valid():
            print("\n\n for is valid")
            author = Profile.objects.get(user=request.user) 
            new_note = form.save(commit=False)
            new_note.user = author
            new_note.checklist = checklist
            new_note.save()

            return redirect('task_detail', slug=slug)

    context.update({
        'form': form,
        'title': checklist,
    })

    return render(request, 'projects/checklist.html', context)

@login_required
def delete_notes(request, note_id = None):
    del_note = Note.objects.get(id = note_id)
    del_note.delete()

    return redirect('teams')

My urls.py

urlpatterns = [
    path('projects/', teams, name='teams'),
    path('projects/project/<slug>/', projects, name='projects'),
    path('projects/tasks/<slug>/', project_detail, name='project_detail'),
    path('projects/checklist/<slug>/', task_detail, name='task_detail'),
    path('projects/checklist/delete_notes/', delete_notes, name='delete_notes'),
]

in the html I have just a href with the url to delete

<a class="dropdown-item text-danger" href="{% url 'delete_notes' notes.id %}">Delete</a>

Getting; Reverse for ‘delete_notes’ with arguments ‘(14,)’ not found. 1 pattern(s) tried: [‘projects/checklist/delete_notes/\Z’]

Not really sure what is missing, thought the slug from checklist was already passed?

>Solution :

You should specify a parameter where to put the notes.id parameter, for example:

path('projects/checklist/delete_notes/<int:note_id>/', delete_notes, name='delete_notes'),

Such view however should only be triggered with a POST or DELETE request, not with a GET request: a GET request should only be used to retrieve data, not to alter entities.

So you protect the view with:

from django.views.decorators.http import require_http_methods

@login_required
@require_http_methods(['POST', 'DELETE'])
def delete_notes(request, note_id):
    Note.objects.filter(id=note_id).delete()
    return redirect('teams')

and in the template you should work with a "mini-form":

<form method="post" action="{% url 'delete_notes' notes.id %}">
    {% csrf_token %}
    <button type="submit">Delete</button>
</form>

If you want to redirect to the task_detail of a given task, you can add an extra parameter:

path('projects/checklist/delete_notes/<int:note_id>/<slug:slug>/', delete_notes, name='delete_notes'),

and redirect with:

from django.views.decorators.http import require_http_methods

@login_required
@require_http_methods(['POST', 'DELETE'])
def delete_notes(request, note_id, slug):
    Note.objects.filter(id=note_id).delete()
    return redirect('task_detail', slug=slug)

then in the form you should pass the slug of the task:

<form method="post" action="{% url 'delete_notes' notes.id task.slug %}">
    {% csrf_token %}
    <button type="submit">Delete</button>
</form>