mirror of
https://github.com/LemmyNet/lemmy.git
synced 2024-11-30 00:01:25 +00:00
c11e9446c6
* Fix hot_rank algorithm pushing downvoted content off the feed. - Max hot_rank algorithm now uses max(2, score) rather than greatest(1, score + 3) - Fixes #4084 * Fixing SQL format. * Adding 2 to bias the positive scores.
25 lines
1 KiB
PL/PgSQL
25 lines
1 KiB
PL/PgSQL
-- The hot_rank algorithm currently uses greatest(1, score + 3)
|
|
-- This greatest of 1 incorrect because log10(1) is zero,
|
|
-- so it will push negative-voted comments / posts to the bottom, IE hot_rank = 0
|
|
-- The update_scheduled_ranks will never recalculate them, because it ignores content
|
|
-- with hot_rank = 0
|
|
CREATE OR REPLACE FUNCTION hot_rank (score numeric, published timestamp with time zone)
|
|
RETURNS float
|
|
AS $$
|
|
DECLARE
|
|
hours_diff numeric := EXTRACT(EPOCH FROM (now() - published)) / 3600;
|
|
BEGIN
|
|
-- 24 * 7 = 168, so after a week, it will default to 0.
|
|
IF (hours_diff > 0 AND hours_diff < 168) THEN
|
|
-- Use greatest(2,score), so that the hot_rank will be positive and not ignored.
|
|
RETURN log(greatest (2, score + 2)) / power((hours_diff + 2), 1.8);
|
|
ELSE
|
|
-- if the post is from the future, set hot score to 0. otherwise you can game the post to
|
|
-- always be on top even with only 1 vote by setting it to the future
|
|
RETURN 0.0;
|
|
END IF;
|
|
END;
|
|
$$
|
|
LANGUAGE plpgsql
|
|
IMMUTABLE PARALLEL SAFE;
|
|
|