The order of the WHERE in this query was wrong, but it is correct now.
postModel = list(PostModel.objects.raw(
SELECT max(pub_date),
count(topic_id) AS freq,
count(DISTINCT author) AS contributors
FROM crudapp_postmodel
WHERE author = "art"
GROUP BY topic_id
ORDER BY pub_date DESC
))
Thanks
Simple:
SELECT max(pub_date),
count(topic_id) AS freq,
count(DISTINCT author) AS contributors
FROM crudapp_postmodel
WHERE author = "art"
GROUP BY topic_id
ORDER BY pub_date DESC