Adding a per-post comments feed with Django 1.0

Date: 2010-03-27 | Modified: 2010-03-30 | Tags: blogproject, django | 2 Comments

I've added an Atom feed for comments on a single post on this blog (per a request in the comments). Here are my notes. I am using Django 1.0. (Note: the Django feeds framework has changed for 1.2. See the Django 1.2 release notes for more information.)

Added to /srv/SaltyCrane/iwiwdsmi/feeds.py:

from django.contrib.comments.models import Comment
from django.contrib.syndication.feeds import Feed, FeedDoesNotExist
from django.utils.feedgenerator import Atom1Feed
from django.core.exceptions import ObjectDoesNotExist
from iwiwdsmi.myblogapp.models import Post
from iwiwdsmi.settings import SITE_NAME

class CommentsByPost(Feed):
    title_template = "feeds/comments_title.html"
    description_template = "feeds/comments_description.html"
    feed_type = Atom1Feed

    def get_object(self, bits):
        if len(bits) != 1:
            raise ObjectDoesNotExist
        return Post.objects.get(id=bits[0])

    def title(self, obj):
        return '%s' % obj

    def description(self, obj):
        return 'Comments on "%s": %s' % (obj, SITE_NAME)

    def link(self, obj):
        if not obj:
            raise FeedDoesNotExist
        return obj.get_absolute_url() + "#comments"

    def items(self, obj):
        return Comment.objects.filter(object_pk=str(obj.id),
                                      is_public=True,
                                      is_removed=False,
                                      ).order_by('-submit_date')

    def item_pubdate(self, item):
        return item.submit_date

Added to /srv/SaltyCrane/iwiwdsmi/urls.py:

from iwiwdsmi.feeds import CommentsByPost
feeds = {
    'comments': CommentsByPost,
}

urlpatterns = patterns(
    '',
    (r'^feeds/(?P<url>.*)/$', 'django.contrib.syndication.views.feed',
     {'feed_dict': feeds}),
)

Added /srv/SaltyCrane/iwiwdsmi/templates/feeds/comments_title.html:

Comment by {{ obj.name|escape }}

Added /srv/SaltyCrane/iwiwdsmi/templates/feeds/comments_description.html:

{% load markup %}
{{ obj.comment|markdown:"safe" }}

Added to /srv/SaltyCrane/iwiwdsmi/templates/myblogapp/singlepost.html:

<a href="/feeds/comments/{{ post.id }}/">
  <img src="http://saltycrane.s3.amazonaws.com/image/icon_feed_orange_14x14_1.png" style="border: 0pt none ; vertical-align: middle;" alt="feed icon">
  Comments feed for this post</a>