root/satchmoproject.com/satchmo_website/apps/blog/feeds.py

from django.contrib.syndication.feeds import Feed
from blog.models import Entry
from tagging.models import Tag, TaggedItem
from django.core.exceptions import ObjectDoesNotExist
from django.http import Http404

class LatestEntries(Feed):
    title = "Satchmoproject.com blog entries"
    link = "http://www.satchmoproject.com/blog/"
    description = "Updates on the latest postings at the satchmo project web site."

    def items(self):
        return Entry.objects.published().order_by('-pub_date')[:5]


class LatestEntriesByTag(Feed):

    def get_object(self, bits):
        # In case of "/rss/beats/0613/foo/bar/baz/", or other such clutter,
        # check that bits has only one member.
        if len(bits) != 1:
            raise ObjectDoesNotExist
        entry_tag = Tag.objects.get(name=bits[0])
        return TaggedItem.objects.get_by_model(Entry, entry_tag), bits[0]

    def title(self, obj):
        return "Latest satchmo project news by tag"

    def link(self, obj):
        try:
            return "http://www.satchmoproject.com/blog/tag/%s/" % obj[1]
        except TypeError:
            return "http://www.satchmoproject.com/blog/tag/"

    def description(self, obj):
        try:
            return "Satchmo items tagged with %s" % obj[1]
        except TypeError:
            return "Unknown tag"

    def items(self, obj):
        if obj:
            return obj[0].order_by('-pub_date')[:5]
        else:
            raise Http404