mirror of
https://github.com/LemmyNet/lemmy.git
synced 2024-12-29 14:21:34 +00:00
107 lines
3.1 KiB
PL/PgSQL
107 lines
3.1 KiB
PL/PgSQL
-- Add post aggregates
|
|
create table post_aggregates (
|
|
id serial primary key,
|
|
post_id int references post on update cascade on delete cascade not null,
|
|
comments bigint not null default 0,
|
|
score bigint not null default 0,
|
|
upvotes bigint not null default 0,
|
|
downvotes bigint not null default 0,
|
|
newest_comment_time timestamp not null default now(),
|
|
unique (post_id)
|
|
);
|
|
|
|
insert into post_aggregates (post_id, comments, score, upvotes, downvotes, newest_comment_time)
|
|
select
|
|
p.id,
|
|
coalesce(ct.comments, 0::bigint) as comments,
|
|
coalesce(pl.score, 0::bigint) as score,
|
|
coalesce(pl.upvotes, 0::bigint) as upvotes,
|
|
coalesce(pl.downvotes, 0::bigint) as downvotes,
|
|
greatest(ct.recent_comment_time, p.published) as newest_activity_time
|
|
from post p
|
|
left join (
|
|
select comment.post_id,
|
|
count(*) as comments,
|
|
max(comment.published) as recent_comment_time
|
|
from comment
|
|
group by comment.post_id
|
|
) ct on ct.post_id = p.id
|
|
left join (
|
|
select post_like.post_id,
|
|
sum(post_like.score) as score,
|
|
sum(post_like.score) filter (where post_like.score = 1) as upvotes,
|
|
-sum(post_like.score) filter (where post_like.score = '-1'::integer) as downvotes
|
|
from post_like
|
|
group by post_like.post_id
|
|
) pl on pl.post_id = p.id;
|
|
|
|
-- Add community aggregate triggers
|
|
|
|
-- initial post add
|
|
create function post_aggregates_post()
|
|
returns trigger language plpgsql
|
|
as $$
|
|
begin
|
|
IF (TG_OP = 'INSERT') THEN
|
|
insert into post_aggregates (post_id) values (NEW.id);
|
|
ELSIF (TG_OP = 'DELETE') THEN
|
|
delete from post_aggregates where post_id = OLD.id;
|
|
END IF;
|
|
return null;
|
|
end $$;
|
|
|
|
create trigger post_aggregates_post
|
|
after insert or delete on post
|
|
for each row
|
|
execute procedure post_aggregates_post();
|
|
|
|
-- comment count
|
|
create function post_aggregates_comment_count()
|
|
returns trigger language plpgsql
|
|
as $$
|
|
begin
|
|
IF (TG_OP = 'INSERT') THEN
|
|
update post_aggregates pa
|
|
set comments = comments + 1,
|
|
newest_comment_time = NEW.published
|
|
where pa.post_id = NEW.post_id;
|
|
ELSIF (TG_OP = 'DELETE') THEN
|
|
update post_aggregates pa
|
|
set comments = comments - 1
|
|
where pa.post_id = OLD.post_id;
|
|
END IF;
|
|
return null;
|
|
end $$;
|
|
|
|
create trigger post_aggregates_comment_count
|
|
after insert or delete on comment
|
|
for each row
|
|
execute procedure post_aggregates_comment_count();
|
|
|
|
-- post score
|
|
create function post_aggregates_score()
|
|
returns trigger language plpgsql
|
|
as $$
|
|
begin
|
|
IF (TG_OP = 'INSERT') THEN
|
|
update post_aggregates pa
|
|
set score = score + NEW.score,
|
|
upvotes = case when NEW.score = 1 then upvotes + 1 else upvotes end,
|
|
downvotes = case when NEW.score = -1 then downvotes + 1 else downvotes end
|
|
where pa.post_id = NEW.post_id;
|
|
|
|
ELSIF (TG_OP = 'DELETE') THEN
|
|
update post_aggregates pa
|
|
set score = score - OLD.score,
|
|
upvotes = case when OLD.score = 1 then upvotes - 1 else upvotes end,
|
|
downvotes = case when OLD.score = -1 then downvotes - 1 else downvotes end
|
|
where pa.post_id = OLD.post_id;
|
|
|
|
END IF;
|
|
return null;
|
|
end $$;
|
|
|
|
create trigger post_aggregates_score
|
|
after insert or delete on post_like
|
|
for each row
|
|
execute procedure post_aggregates_score();
|