lemmy/server/migrations/2020-08-06-205355_update_community_post_count/up.sql

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-- Drop first
drop view community_view;
drop view community_aggregates_view;
drop view community_fast_view;
drop table community_aggregates_fast;
create view community_aggregates_view as
select
c.id,
c.name,
c.title,
c.icon,
c.banner,
c.description,
c.category_id,
c.creator_id,
c.removed,
c.published,
c.updated,
c.deleted,
c.nsfw,
c.actor_id,
c.local,
c.last_refreshed_at,
u.actor_id as creator_actor_id,
u.local as creator_local,
u.name as creator_name,
u.preferred_username as creator_preferred_username,
u.avatar as creator_avatar,
cat.name as category_name,
coalesce(cf.subs, 0) as number_of_subscribers,
coalesce(cd.posts, 0) as number_of_posts,
coalesce(cd.comments, 0) as number_of_comments,
hot_rank(cf.subs, c.published) as hot_rank
from community c
left join user_ u on c.creator_id = u.id
left join category cat on c.category_id = cat.id
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_id,
count(*) as subs
from community_follower
group by community_id
) cf on cf.community_id = c.id;
create view community_view as
select
cv.*,
us.user as user_id,
us.is_subbed::bool as subscribed
from community_aggregates_view cv
cross join lateral (
select
u.id as user,
coalesce(cf.community_id, 0) as is_subbed
from user_ u
left join community_follower cf on u.id = cf.user_id and cf.community_id = cv.id
) as us
union all
select
cv.*,
null as user_id,
null as subscribed
from community_aggregates_view cv;
-- The community fast table
create table community_aggregates_fast as select * from community_aggregates_view;
alter table community_aggregates_fast add primary key (id);
create view community_fast_view as
select
ac.*,
u.id as user_id,
(select cf.id::boolean from community_follower cf where u.id = cf.user_id and ac.id = cf.community_id) as subscribed
from user_ u
cross join (
select
ca.*
from community_aggregates_fast ca
) ac
union all
select
caf.*,
null as user_id,
null as subscribed
from community_aggregates_fast caf;