views.py

def view_historic_reversion(request, iid, vid):
    item = get_object_or_404(MDR._concept, pk=iid).item
    if not user_can_view(request.user, item):
        if request.user.is_anonymous():
            return redirect(reverse('friendly_login') + '?next=%s' % request.path)
        else:
            raise PermissionDenied

    old_item = default_revision_manager.get_for_object_reference(
        item.__class__,
        item.pk,
    ).filter(id=int(vid)).first()
    
    if old_item is None:
        raise Http404
    else:
        old_item = old_item.object_version.object
        old_item._meta = item._meta
        old_item.id = item.id

    default_template = "%s/concepts/%s.html" % (item.__class__._meta.app_label, item.__class__._meta.model_name)
    template = select_template([default_template, item.template])
    context = RequestContext(
        request,
        {
            'item': old_item,
            'original_item':item,
        }
    )

    return HttpResponse(template.render(context))