[Answered ]-How to add comment form in ListView Django?

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You can not return aq ValidationError in the view, you need to return a HTTP response, or raise a Http404 exception for example:

from django.http import Http404
from django.shortcuts import redirect

def ListViewPage(request):
    queryset = Post.objects.all()
    if request.method == 'POST':
        try:
            pk = request.POST.get('pk')
            post = Post.objects.get(id=pk)
        except Post.DoesNotExist:
            raise Http404(f'No Post by id {pk}')
        comment_form = CommentForm(data=request.POST)
        if comment_form.is_valid():
            comment_form.instance.posts = post
            comment_form.save()
            return redirect('name-of-some-view')
    else:
        comment_form = CommentForm()
    context = {
        'posts': queryset,
        'form': comment_form
    }
    return render(request, 'post_list.html', context)

Note: In case of a successful POST request, you should make a redirect
[Django-doc]
to implement the Post/Redirect/Get pattern [wiki].
This avoids that you make the same POST request when the user refreshes the
browser.

👤willeM_ Van Onsem

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