lemmy/migrations/2023-07-08-101154_fix_soft_delete_aggregates/down.sql

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-- 2023-06-19-120700_no_double_deletion/up.sql
create or replace function was_removed_or_deleted(TG_OP text, OLD record, NEW record)
RETURNS boolean
LANGUAGE plpgsql
as $$
begin
IF (TG_OP = 'INSERT') THEN
return false;
end if;
IF (TG_OP = 'DELETE' AND OLD.deleted = 'f' AND OLD.removed = 'f') THEN
return true;
end if;
return TG_OP = 'UPDATE' AND (
(OLD.deleted = 'f' AND NEW.deleted = 't') OR
(OLD.removed = 'f' AND NEW.removed = 't')
);
END $$;
-- 2022-04-04-183652_update_community_aggregates_on_soft_delete/up.sql
create or replace function was_restored_or_created(TG_OP text, OLD record, NEW record)
RETURNS boolean
LANGUAGE plpgsql
as $$
begin
IF (TG_OP = 'DELETE') THEN
return false;
end if;
IF (TG_OP = 'INSERT') THEN
return true;
end if;
return TG_OP = 'UPDATE' AND (
(OLD.deleted = 't' AND NEW.deleted = 'f') OR
(OLD.removed = 't' AND NEW.removed = 'f')
);
END $$;
-- 2021-08-02-002342_comment_count_fixes/up.sql
create or replace function post_aggregates_comment_deleted()
returns trigger language plpgsql
as $$
begin
IF NEW.deleted = TRUE THEN
update post_aggregates pa
set comments = comments - 1
where pa.post_id = NEW.post_id;
ELSE
update post_aggregates pa
set comments = comments + 1
where pa.post_id = NEW.post_id;
END IF;
return null;
end $$;
create trigger post_aggregates_comment_set_deleted
after update of deleted on comment
for each row
execute procedure post_aggregates_comment_deleted();
create or replace function post_aggregates_comment_count()
returns trigger language plpgsql
as $$
begin
IF (TG_OP = 'INSERT') THEN
update post_aggregates pa
set comments = comments + 1,
newest_comment_time = NEW.published
where pa.post_id = NEW.post_id;
-- A 2 day necro-bump limit
update post_aggregates pa
set newest_comment_time_necro = NEW.published
from post p
where pa.post_id = p.id
and pa.post_id = NEW.post_id
-- Fix issue with being able to necro-bump your own post
and NEW.creator_id != p.creator_id
and pa.published > ('now'::timestamp - '2 days'::interval);
ELSIF (TG_OP = 'DELETE') THEN
-- Join to post because that post may not exist anymore
update post_aggregates pa
set comments = comments - 1
from post p
where pa.post_id = p.id
and pa.post_id = OLD.post_id;
ELSIF (TG_OP = 'UPDATE') THEN
-- Join to post because that post may not exist anymore
update post_aggregates pa
set comments = comments - 1
from post p
where pa.post_id = p.id
and pa.post_id = OLD.post_id;
END IF;
return null;
end $$;
-- 2020-12-10-152350_create_post_aggregates/up.sql
create or replace trigger post_aggregates_comment_count
after insert or delete on comment
for each row
execute procedure post_aggregates_comment_count();