POST请求中的数据未从模板/表单传递到Django中进行查看

Question

Actually, I'm not really sure what the problem exactly is, but I think data from the form/template is not being passed to the view in my Django app.

Running a test gives:

AttributeError: 'NoneType' object has no attribute 'id'

The form:

    <form action="/{{ link.id }}/{{ node.id }}/" method="post" class="comment-form">
        {% csrf_token %}
        {% for field in form %}
            {{ field.label_tag }} {{ field }}
            {% if field.help_text %}
            <p class="help">{{ field.help_text|safe }}</p>
            {% endif %}
        {% endfor %}
        <input type="submit" value="submit">
    </form>

The view:

def comments(request, link_id, comment_id=None):
    link = get_object_or_404(Link, pk=link_id)
    if comment_id is not None:
        parent = get_object_or_404(Comment, pk=comment_id)
    else:
        parent = None
    comments = link.comments.all()
    if request.method == 'POST':
        if request.user.is_authenticated():
            form = CommentForm(data=request.POST,auto_id=True)
            if form.is_valid():
                form.full_clean()
                new_comment = form.save(commit=False)
                new_comment.link = link
                new_comment.parent = parent
                new_comment.save()
                return reverse('comments', kwargs={'link_id':link.id,'comment_id':parent.id})
        else:
            return HttpResponseRedirect('/accounts/login/?next=/{0}/'.format(link.id))
    else:
        form = CommentForm(auto_id=True)
        return render(request, 'posts/comments.html', {'nodes':comments, 'link': link, 'form': form})

The full relevant code is here , because it's maybe a bit much for one stackoverflow post. (Is there a guideline for this?)

here's the (working, for now) project .

Answer 1

This is the key part of the traceback.

    File "/Users/robin/learning/python/parrot/posts/views.py", line 42, in comments
return reverse('comments', kwargs={'link_id':link.id,'comment_id':parent.id})

AttributeError: 'NoneType' object has no attribute 'id'

Since link cannot be None, that suggests that parent is None . Perhaps you need to use a different url if parent_id is None.

The view should return an HttpResponse , not a url. I think you want:

return HttpResponseRedirect(reverse('comments', kwargs={'link_id':link.id,'comment_id':parent.id}))

or you can use the redirect shortcut:

from django.shortcuts import reverse
return redirect('comments', link_id=link.id, comment_id=parent.id)

Answer 2

You state in your view:

    if comment_id is not None:
        parent = get_object_or_404(Comment, pk=comment_id)
    else:
        parent = None

but it seems you never pass comment_id , just link_id , therefore in this line:

return reverse('comments', kwargs={'link_id':link.id,'comment_id':parent.id})

parent is always None.

It would help to see your url mappings as well as CommentForm.