Reverse for url with arguments not found in Django

Question

Error: Reverse for 'task_list_by_tag' with arguments '('оаип_1',)' not found. 1 pattern(s) tried: ['tag/(?P<tag_slug>[-a-zA-Z0-9_]+)/\Z']

views.py

def index(request, tag_slug=None):
    task_list = Task.objects.all()
    
    tag = None

    if tag_slug:
        tag = get_object_or_404(Tag, slug=tag_slug)
        task_list = task_list.filter(tags__in=[tag])

    paginator = Paginator(task_list, 2)
    page_number = request.GET.get('page', 1)
    try:
        tasks = paginator.page(page_number)

    context = {"tasks":tasks, 'tag':tag}

    return render(request, 'main/index.html', context)

urls.py

app_name = 'main'
...
path('tag/<slug:tag_slug>/', views.index, name = "task_list_by_tag"),

index.html

{% for tag in task.tags.all %}
       <a href="{% url "main:task_list_by_tag" tag.slug %}">
           {{ tag.name }}
       </a>
{% if not forloop.last %}, {% endif %}
{% endfor %}

I tried to fix that problem:

1)

<a href="{% url "main:task_list_by_tag" tag_slug=tag.slug %}">

return the error: Reverse for 'task_list_by_tag' with keyword arguments '{'tag_slug': 'оаип_1'}' not found. 1 pattern(s) tried: ['tag/(?P<tag_slug>[-a-zA-Z0-9_]+)/\Z']

2)

`<a href="{% url "main:task_list_by_tag" slug=tag.slug %}">`

Reverse for 'task_list_by_tag' with keyword arguments '{'slug': 'оаип_1'}' not found. 1 pattern(s) tried: ['tag/(?P<tag_slug>[-a-zA-Z0-9_]+)/\Z']

@WillemVOsupportsmodstrike as per Django documentation it should handle underscores. Problem could be non-ASCII characters. — Marco
– Marco, Commented Jul 14, 2023 at 20:40
It might just be a problem with single versus double quotes. Try changing your <a href="{% url "main:task_list_by_tag" tag.slug %}"> to this: <a href="{% url 'main:task_list_by_tag' tag.slug %}"> — raphael
– raphael, Commented Jul 14, 2023 at 21:20
@Marco: aargghh, I didn't see that it was cyrillic. No that will indeed not work, the slug only accepts ASCII alphanumeric characters. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Jul 14, 2023 at 22:23

Marco · Accepted Answer · 2023-07-14 23:14:51Z

0

Using <a href="{% url "main:task_list_by_tag" tag.slug %}"> is perfectly fine as Django has found the correct URL mentioned in:

Error: Reverse for 'task_list_by_tag' with arguments '('оаип_1',)' not found. 1 pattern(s) tried: ['tag/(?P<tag_slug>[-a-zA-Z0-9_]+)/\Z']

But as per Django documentation, you can only use "ASCII letters or numbers, plus the hyphen and underscore characters" for slugs:

slug - Matches any slug string consisting of ASCII letters or numbers, plus the hyphen and underscore characters. For example, building-your-1st-django-site.

Make sure that your slug consists only of these characters and not Cyrillic, as you are doing now. Otherwise, change your URL dispatcher to str.

answered Jul 14, 2023 at 23:14

Marco

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1 Comment

Tamagil Tamagil Over a year ago

your answer is correct. it helped me. thank u

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