Django2.0; still cannot get how redirect works

I'm new to Django and I still don't get how redirect works.

For now, I use this way to redirect.

return HttpResponseRedirect(reverse_lazy('main:index'))


and this way works.

And now I'm creating another page, and what I want to do is to redirect to the same page after I submit the form data.

view.py is like this

def add_comment(request, pk):

entry = Entry.objects.get(id=pk)

if request.method != 'POST':
form = CommentForm()
else:
form = CommentForm(request.POST)

if form.is_valid():
new_comment = form.save(commit=False)
new_comment.user = request.user
new_comment.save()


return redirect('add_comment', pk=entry.id)
return render(request, 'main/add_comment.html', {'form': form, 'entry': entry, 'comments': comments})


urls.py is like this

path('add_comment/<int:pk>', views.add_comment, name='add_comment'),


I can enter this page, but after I submit the form, this error happens.

NoReverseMatch at /add_comment/5

Reverse for 'add_comment' not found. 'add_comment' is not a valid view function or pattern name.

Request URL:
http://127.0.0.1:8000/add_comment/5

even though I can enter this url page, I cannot redirect to the same page.

How am I wrong with this? Also what is the recommended way to redirect to a page?

Side note are you sure that the model is being filled out correctly? After you add more information to the model you will need to call new_comment.save(). If you are not filling out the model correctly it may not be able to navigate to it at that point. Does the redirect work when you navigate to a page that you are sure does work, i.e. / or /google.com?
– tmcnicol
Jun 30 at 1:24

new_comment.save()

/

/google.com

oops, sorry I deleted the line when I post code here.
– bababa
Jun 30 at 1:28

1 Answer
1

You probably need to change this:

return redirect('add_comment', pk=entry.id)


to this:

return redirect('main:add_comment', pk=entry.id))


Assuming that all your URLs are in the same namespace. If your index url is defined in the same list as your add_comment URL then they will be sharing the main namespace.

index

add_comment

main

This works. Thanks a lot.
– bababa
Jun 30 at 7:00

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