mirror of
https://github.com/LemmyNet/lemmy.git
synced 2024-11-05 20:15:01 +00:00
21 lines
762 B
MySQL
21 lines
762 B
MySQL
|
-- Rank = ScaleFactor * sign(Score) * log(1 + abs(Score)) / (Time + 2)^Gravity
|
||
|
|
create or replace function hot_rank(
|
||
|
|
score numeric,
|
||
|
|
published timestamp without time zone)
|
||
|
|
returns numeric as $$
|
||
|
|
begin
|
||
|
|
-- hours_diff:=EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600
|
||
|
|
return 10000*sign(score)*log(1 + abs(score)) / power(((EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600) + 2), 1.8);
|
||
|
|
end; $$
|
||
|
|
LANGUAGE plpgsql;
|
||
|
|
|
||
|
|
create view post_listing as
|
||
|
|
select post.*,
|
||
|
|
(select count(*) from comment where comment.post_id = post.id) as number_of_comments,
|
||
|
|
coalesce(sum(post_like.score),0) as score,
|
||
|
|
hot_rank(coalesce(sum(post_like.score),0), post.published) as hot_rank
|
||
|
|
from post
|
||
|
|
left join post_like
|
||
|
|
on post.id = post_like.post_id
|
||
|
|
group by post.id;
|