How to throw a 404 error if a non-existent link passed regex in urls.py?

Question

Django

Good evening!
Dealt with non-existent pages. But what about categories? You can edit the link in the field and voila - the regular expression check passes, but does not exist in the database. And how to filter?
I wanted to make a filter by the parent slug link that is in the model, but apparently you can only filter by your own fields.
At the moment such a view.

def articles_list(request, category_slug):
    articles = get_list_or_404(Article.objects.order_by('name'))
    context = {
        'articles': articles
    }
    return render(request, 'my_app/articles_list.html', context)

The model has a parent field that refers to the category. But the category_slug does not pass the name of the parent, but its link.
Help me please. I did not find anything in the documentation for such cases.