mirror of https://github.com/LemmyNet/lemmy.git
52 lines
1.7 KiB
PL/PgSQL
52 lines
1.7 KiB
PL/PgSQL
-- 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 integer as $$
|
|
begin
|
|
-- hours_diff:=EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600
|
|
return floor(10000*log(greatest(1,score+3)) / power(((EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600) + 2), 1.8))::integer;
|
|
end; $$
|
|
LANGUAGE plpgsql;
|
|
|
|
create view post_view as
|
|
with all_post as
|
|
(
|
|
select
|
|
p.*,
|
|
(select name from user_ where p.creator_id = user_.id) as creator_name,
|
|
(select name from community where p.community_id = community.id) as community_name,
|
|
(select removed from community c where p.community_id = c.id) as community_removed,
|
|
(select count(*) from comment where comment.post_id = p.id) as number_of_comments,
|
|
coalesce(sum(pl.score), 0) as score,
|
|
count (case when pl.score = 1 then 1 else null end) as upvotes,
|
|
count (case when pl.score = -1 then 1 else null end) as downvotes,
|
|
hot_rank(coalesce(sum(pl.score) , 0), p.published) as hot_rank
|
|
from post p
|
|
left join post_like pl on p.id = pl.post_id
|
|
group by p.id
|
|
)
|
|
|
|
select
|
|
ap.*,
|
|
u.id as user_id,
|
|
coalesce(pl.score, 0) as my_vote,
|
|
(select cf.id::bool from community_follower cf where u.id = cf.user_id and cf.community_id = ap.community_id) as subscribed,
|
|
(select pr.id::bool from post_read pr where u.id = pr.user_id and pr.post_id = ap.id) as read,
|
|
(select ps.id::bool from post_saved ps where u.id = ps.user_id and ps.post_id = ap.id) as saved
|
|
from user_ u
|
|
cross join all_post ap
|
|
left join post_like pl on u.id = pl.user_id and ap.id = pl.post_id
|
|
|
|
union all
|
|
|
|
select
|
|
ap.*,
|
|
null as user_id,
|
|
null as my_vote,
|
|
null as subscribed,
|
|
null as read,
|
|
null as saved
|
|
from all_post ap
|
|
;
|