Errors using built-in comment framework

I'm trying to use the built-in comment framework but I cannot get it to work. Here's the code:

#view.py
from django.contrib.comments.forms import *
from forms import *
from models import *

def view_item_detail(request, item_id):
    item = Item.manager.get(item_id)
    form = CommentForm(item)

    if request.POST:
        form = CommentForm(request.POST)
        if form.is_valid():
            new_comment = form.save(commit=False)
            # do stuff here
            new_comment.save()
            messages.success(request, "Your comment was successfully posted!")
            return HttpResponseRedirect("")

    return render_to_response('item_detail.html', 
                          RequestContext(request, {'item': item, 
                                    'authentication': request.user.is_authenticated(), 
                                    'user': request.user,开发者_JAVA百科 'form': form}))

and

#item_detail.html
{% if authentication %}
    {% if form %}
        <form action="" method="post">{% csrf_token %}
            {{ form }}
            <p><input type="submit" name="submit" value="Submit comment" /></p>
        </form>
    {% endif %}
{% else %}
    <p>You must be logged-in to post a comment</p>
{% endif %}

The error I'm getting is "'QueryDict' object has no attribute '_meta'" which is coming from the line

form = CommentForm(request.POST)

Any help would be appreciated, cheers.

Sorry after reading your comments to my last answer you don't need to include the comment form in your view if you are using the built in comment framework:

from forms import *
from models import *

def view_item_detail(request, item_id):
    item = get_object_or_404(Item, pk=item_id)

    return render_to_response('item_detail.html', 
                          RequestContext(request, {'item': item, 
                                    'authentication': request.user.is_authenticated(), 
                                    'user': request.user,}))

now make sure you have this in your urls.py:

urlpatterns = patterns('',
    ...
    (r'^comments/', include('django.contrib.comments.urls')),
    ...
)

and 'django.contrib.comments' added to your INSTALLED_APPS, and syncdb'd

now in your item_detail.html file you should add:

{% load comments %}

where you want the comments displayed:

{% render_comment_list for item %}

where you want the add comments form displayed:

{% if authentication %}
    {% get_comment_form for item as form %}
    <form action="{% comment_form_target %}" method="post">
        {{ form }}
        <tr>
            <td></td>
            <td><input type="submit" name="preview" class="submit-post" value="Preview"></td>
        </tr>
    </form>
{% endif %}

read the docs here and for customization read this page.

as part of the docs:

To specify the URL you want to redirect to after the comment has been posted, you can include a hidden form input called next in your comment form. For example:

<input type="hidden" name="next" value="{% url my_comment_was_posted %}" />

(edited for your example):

{% if authentication %}
    {% get_comment_form for item as form %}
    <form action="{% comment_form_target %}" method="post">
        {{ form }}
        <tr>
            <td></td>
            <input type="hidden" name="next" value="{{ item.get_absolute_url }}" />
            <td><input type="submit" name="preview" class="submit-post" value="Preview"></td>
        </tr>
    </form>
{% else %}
    <p>You must be logged-in to post a comment</p>
{% endif %}