Got it! :)
stories = {}
collection_id=request.args(0)
collection = db.collection[collection_id] or redirect(error_page)
stories=db(db.story.collection.contains(collection_id)).select(orderby=db.story.title)
length=len(stories);
scheme = request.env.get('WSGI_URL_SCHEME', 'http').lower()
rss = rss2.RSS2(title=collection.title,
link = scheme + '://' + request.env.http_host +
request.env.path_info,
description = collection.description,
lastBuildDate = collection.modified_on,
items = [
rss2.RSSItem(title = story.title,
link = story.url,
enclosure = rss2.Enclosure(story.audio_url, 0, 'audio/
mpeg'),
description = story.description,
comments = 'test',
pubDate = story.date) for story in stories])
response.headers['Content-Type']='application/rss+xml'
return rss2.dumps(rss)
