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

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-- 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;