92 lines
2.7 KiB
PL/PgSQL
92 lines
2.7 KiB
PL/PgSQL
-- Add community aggregates
|
|
create table community_aggregates (
|
|
id serial primary key,
|
|
community_id int references community on update cascade on delete cascade not null,
|
|
subscribers bigint not null,
|
|
posts bigint not null,
|
|
comments bigint not null,
|
|
unique (community_id)
|
|
);
|
|
|
|
insert into community_aggregates (community_id, subscribers, posts, comments)
|
|
select
|
|
c.id,
|
|
coalesce(cf.subs, 0::bigint) as subscribers,
|
|
coalesce(cd.posts, 0::bigint) as posts,
|
|
coalesce(cd.comments, 0::bigint) as comments
|
|
from community c
|
|
left join (
|
|
select
|
|
p.community_id,
|
|
count(distinct p.id) as posts,
|
|
count(distinct ct.id) as comments
|
|
from post p
|
|
left join comment ct on p.id = ct.post_id
|
|
group by p.community_id
|
|
) cd on cd.community_id = c.id
|
|
left join (
|
|
select
|
|
community_follower.community_id,
|
|
count(*) as subs
|
|
from community_follower
|
|
group by community_follower.community_id
|
|
) cf on cf.community_id = c.id;
|
|
|
|
-- Add community aggregate triggers
|
|
-- post count
|
|
create function community_aggregates_post_count()
|
|
returns trigger language plpgsql
|
|
as $$
|
|
begin
|
|
IF (TG_OP = 'INSERT') THEN
|
|
update community_aggregates
|
|
set posts = posts + 1 where community_id = NEW.community_id;
|
|
ELSIF (TG_OP = 'DELETE') THEN
|
|
update community_aggregates
|
|
set posts = posts - 1 where community_id = OLD.community_id;
|
|
END IF;
|
|
return null;
|
|
end $$;
|
|
|
|
create trigger community_aggregates_post_count
|
|
after insert or delete on post
|
|
execute procedure community_aggregates_post_count();
|
|
|
|
-- comment count
|
|
create function community_aggregates_comment_count()
|
|
returns trigger language plpgsql
|
|
as $$
|
|
begin
|
|
IF (TG_OP = 'INSERT') THEN
|
|
update community_aggregates
|
|
set comments = comments + 1 from comment c join post p on p.id = c.post_id and p.id = NEW.post_id;
|
|
ELSIF (TG_OP = 'DELETE') THEN
|
|
update community_aggregates
|
|
set comments = comments - 1 from comment c join post p on p.id = c.post_id and p.id = OLD.post_id;
|
|
END IF;
|
|
return null;
|
|
end $$;
|
|
|
|
create trigger community_aggregates_comment_count
|
|
after insert or delete on comment
|
|
execute procedure community_aggregates_comment_count();
|
|
|
|
-- subscriber count
|
|
create function community_aggregates_subscriber_count()
|
|
returns trigger language plpgsql
|
|
as $$
|
|
begin
|
|
IF (TG_OP = 'INSERT') THEN
|
|
update community_aggregates
|
|
set subscribers = subscribers + 1 where community_id = NEW.community_id;
|
|
ELSIF (TG_OP = 'DELETE') THEN
|
|
update community_aggregates
|
|
set subscribers = subscribers - 1 where community_id = OLD.community_id;
|
|
END IF;
|
|
return null;
|
|
end $$;
|
|
|
|
create trigger community_aggregates_subscriber_count
|
|
after insert or delete on community_follower
|
|
execute procedure community_aggregates_subscriber_count();
|
|
|