为什么此代码不起作用，如何获取url的特定部分？

Question

I have the following url http://localhost:8000/enthusiastically-synergize-optimal-results-after-proactive-total-linkage/edit/ and would like to access that slug from this url in this function so I can use it. In class based view I could use self.kwargs.get('smthng') and grab that but don't know how do I do that here:

def permission_of_user_for_posts(request):
post = get_object_or_404(Blog, slug= request.GET.get('blog_slug'))
if request.user.username == post.author:
    return True
return False


@user_passes_test(permission_of_user_for_posts)
def blog_update(request, blog_slug):
blog = get_object_or_404(Blog, slug=blog_slug)
if request.method == 'POST':
    form = BlogForm(request.POST, request.FILES, instance=blog)
    if form.is_valid():
        form.instance.author = request.user
        form.save()
        return redirect('/')

form = BlogForm(instance=blog)
context= {
    'form': form
}
return render(request, 'blogs/form.html', context)

or is there something else that I am doing it wrong in permission_of_user_for_posts function? please help me thank you

edit: this is url

urlpatterns = [
    path('', blogs_view.home, name='home'),
    path('blogs/', blogs_view.blogs, name='blogs'),
    path('<slug:blog_slug>', blogs_view.blog_detail, name='blog_detail'),
    path('post/', blogs_view.blog_create, name='blog_create'),
    path('<slug:blog_slug>/edit/', blogs_view.blog_update, name='blog_update'),
    path('<slug:blog_slug>/delete/', blogs_view.blog_delete, name='blog_delete'),
]

Answer 1

The way to do this is not to use the decorator or a separate function at all. Just check the post in the view:

def blog_update(request, blog_slug):
    blog = get_object_or_404(Blog, slug=blog_slug)
    if not request.user == blog.author:
        raise PermissionDenied 
    if request.method == 'POST':
        ...