lemmy/migrations/2020-10-07-234221_fix_fast_triggers/up.sql

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-- This adds on conflict do nothing triggers to all the insert_intos
-- Github issue: https://github.com/LemmyNet/lemmy/issues/1179
create or replace function refresh_community()
returns trigger language plpgsql
as $$
begin
IF (TG_OP = 'DELETE') THEN
delete from community_aggregates_fast where id = OLD.id;
ELSIF (TG_OP = 'UPDATE') THEN
delete from community_aggregates_fast where id = OLD.id;
insert into community_aggregates_fast select * from community_aggregates_view where id = NEW.id on conflict (id) do nothing;
-- Update user view due to owner changes
delete from user_fast where id = NEW.creator_id;
insert into user_fast select * from user_view where id = NEW.creator_id on conflict (id) do nothing;
-- Update post view due to community changes
delete from post_aggregates_fast where community_id = NEW.id;
insert into post_aggregates_fast select * from post_aggregates_view where community_id = NEW.id on conflict (id) do nothing;
-- TODO make sure this shows up in the users page ?
ELSIF (TG_OP = 'INSERT') THEN
insert into community_aggregates_fast select * from community_aggregates_view where id = NEW.id;
END IF;
return null;
end $$;
create or replace function refresh_user()
returns trigger language plpgsql
as $$
begin
IF (TG_OP = 'DELETE') THEN
delete from user_fast where id = OLD.id;
ELSIF (TG_OP = 'UPDATE') THEN
delete from user_fast where id = OLD.id;
insert into user_fast select * from user_view where id = NEW.id on conflict(id) do nothing;
-- Refresh post_fast, cause of user info changes
delete from post_aggregates_fast where creator_id = NEW.id;
insert into post_aggregates_fast select * from post_aggregates_view where creator_id = NEW.id on conflict (id) do nothing;
delete from comment_aggregates_fast where creator_id = NEW.id;
insert into comment_aggregates_fast select * from comment_aggregates_view where creator_id = NEW.id on conflict (id) do nothing;
ELSIF (TG_OP = 'INSERT') THEN
insert into user_fast select * from user_view where id = NEW.id;
END IF;
return null;
end $$;
create or replace function refresh_post()
returns trigger language plpgsql
as $$
begin
IF (TG_OP = 'DELETE') THEN
delete from post_aggregates_fast where id = OLD.id;
-- Update community number of posts
update community_aggregates_fast set number_of_posts = number_of_posts - 1 where id = OLD.community_id;
ELSIF (TG_OP = 'UPDATE') THEN
delete from post_aggregates_fast where id = OLD.id;
insert into post_aggregates_fast select * from post_aggregates_view where id = NEW.id on conflict (id) do nothing;
ELSIF (TG_OP = 'INSERT') THEN
insert into post_aggregates_fast select * from post_aggregates_view where id = NEW.id;
-- Update that users number of posts, post score
delete from user_fast where id = NEW.creator_id;
insert into user_fast select * from user_view where id = NEW.creator_id on conflict (id) do nothing;
-- Update community number of posts
update community_aggregates_fast set number_of_posts = number_of_posts + 1 where id = NEW.community_id;
-- Update the hot rank on the post table
-- TODO this might not correctly update it, using a 1 week interval
update post_aggregates_fast as paf
set hot_rank = pav.hot_rank
from post_aggregates_view as pav
where paf.id = pav.id and (pav.published > ('now'::timestamp - '1 week'::interval));
END IF;
return null;
end $$;
create or replace function refresh_comment()
returns trigger language plpgsql
as $$
begin
IF (TG_OP = 'DELETE') THEN
delete from comment_aggregates_fast where id = OLD.id;
-- Update community number of comments
update community_aggregates_fast as caf
set number_of_comments = number_of_comments - 1
from post as p
where caf.id = p.community_id and p.id = OLD.post_id;
ELSIF (TG_OP = 'UPDATE') THEN
delete from comment_aggregates_fast where id = OLD.id;
insert into comment_aggregates_fast select * from comment_aggregates_view where id = NEW.id on conflict (id) do nothing;
ELSIF (TG_OP = 'INSERT') THEN
insert into comment_aggregates_fast select * from comment_aggregates_view where id = NEW.id;
-- Update user view due to comment count
update user_fast
set number_of_comments = number_of_comments + 1
where id = NEW.creator_id;
-- Update post view due to comment count, new comment activity time, but only on new posts
-- TODO this could be done more efficiently
delete from post_aggregates_fast where id = NEW.post_id;
insert into post_aggregates_fast select * from post_aggregates_view where id = NEW.post_id on conflict (id) do nothing;
-- Force the hot rank as zero on week-older posts
update post_aggregates_fast as paf
set hot_rank = 0
where paf.id = NEW.post_id and (paf.published < ('now'::timestamp - '1 week'::interval));
-- Update community number of comments
update community_aggregates_fast as caf
set number_of_comments = number_of_comments + 1
from post as p
where caf.id = p.community_id and p.id = NEW.post_id;
END IF;
return null;
end $$;