lemmy/migrations/2023-06-19-120700_no_double_deletion/up.sql

-- Deleting after removing should not decrement the count twice.
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 $$;

-- Recalculate proper comment count.
UPDATE person_aggregates
    SET comment_count = cnt.count
    FROM (
    SELECT creator_id, count(*) AS count FROM comment
    WHERE deleted='f' AND removed='f'
    GROUP BY creator_id
        ) cnt
    WHERE person_aggregates.person_id = cnt.creator_id;

-- Recalculate proper comment score.
UPDATE person_aggregates ua
    SET comment_score = cd.score
    FROM (
        SELECT u.id AS creator_id,
            coalesce(0, sum(cl.score)) as score
        -- User join because comments could be empty
        FROM person u
            LEFT JOIN comment c ON u.id = c.creator_id AND c.deleted = 'f' AND c.removed = 'f'
            LEFT JOIN comment_like cl ON c.id = cl.comment_id
        GROUP BY u.id
    ) cd
    WHERE ua.person_id = cd.creator_id;

-- Recalculate proper post count.
UPDATE person_aggregates
    SET post_count = cnt.count
    FROM (
    SELECT creator_id, count(*) AS count FROM post
    WHERE deleted='f' AND removed='f'
    GROUP BY creator_id
        ) cnt
    WHERE person_aggregates.person_id = cnt.creator_id;

-- Recalculate proper post score.
 UPDATE person_aggregates ua
    SET post_score = pd.score
    FROM (
        SELECT u.id AS creator_id,
            coalesce(0, sum(pl.score)) AS score
            -- User join because posts could be empty
        FROM person u
            LEFT JOIN post p ON u.id = p.creator_id AND p.deleted = 'f' AND p.removed = 'f'
            LEFT JOIN post_like pl ON p.id = pl.post_id
        GROUP BY u.id
    ) pd
    WHERE ua.person_id = pd.creator_id;