lemmy/migrations/2023-07-08-101154_fix_soft_.../up.sql

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-- Fix for duplicated decrementations when both `deleted` and `removed` fields are set subsequently
create or replace function was_removed_or_deleted(TG_OP text, OLD record, NEW record)
RETURNS boolean
LANGUAGE plpgsql
as $$
begin
IF (TG_OP = 'INSERT') THEN
return false;
end if;
IF (TG_OP = 'DELETE' AND OLD.deleted = 'f' AND OLD.removed = 'f') THEN
return true;
end if;
return TG_OP = 'UPDATE' AND OLD.deleted = 'f' AND OLD.removed = 'f' AND (
NEW.deleted = 't' OR NEW.removed = 't'
);
END $$;
create or replace function was_restored_or_created(TG_OP text, OLD record, NEW record)
RETURNS boolean
LANGUAGE plpgsql
as $$
begin
IF (TG_OP = 'DELETE') THEN
return false;
end if;
IF (TG_OP = 'INSERT') THEN
return true;
end if;
return TG_OP = 'UPDATE' AND NEW.deleted = 'f' AND NEW.removed = 'f' AND (
OLD.deleted = 't' OR OLD.removed = 't'
);
END $$;
-- Fix for post's comment count not updating after setting `removed` to 't'
drop trigger if exists post_aggregates_comment_set_deleted on comment;
drop function post_aggregates_comment_deleted();
create or replace function post_aggregates_comment_count()
returns trigger language plpgsql
as $$
begin
-- Check for post existence - it may not exist anymore
IF TG_OP = 'INSERT' OR EXISTS (
select 1 from post p where p.id = OLD.post_id
) THEN
IF (was_restored_or_created(TG_OP, OLD, NEW)) THEN
update post_aggregates pa
set comments = comments + 1 where pa.post_id = NEW.post_id;
ELSIF (was_removed_or_deleted(TG_OP, OLD, NEW)) THEN
update post_aggregates pa
set comments = comments - 1 where pa.post_id = OLD.post_id;
END IF;
END IF;
IF TG_OP = 'INSERT' THEN
update post_aggregates pa
set newest_comment_time = NEW.published
where pa.post_id = NEW.post_id;
-- A 2 day necro-bump limit
update post_aggregates pa
set newest_comment_time_necro = NEW.published
from post p
where pa.post_id = p.id
and pa.post_id = NEW.post_id
-- Fix issue with being able to necro-bump your own post
and NEW.creator_id != p.creator_id
and pa.published > ('now'::timestamp - '2 days'::interval);
END IF;
return null;
end $$;
create or replace trigger post_aggregates_comment_count
after insert or delete or update of removed, deleted on comment
for each row
execute procedure post_aggregates_comment_count();