lemmy/migrations/2020-10-10-035723_fix_fast_triggers_2/down.sql

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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 $$
BEGIN
IF (TG_OP = 'DELETE') THEN
DELETE FROM comment_aggregates_fast
WHERE id = OLD.id;
-- Update community number of comments
UPDATE
community_aggregates_fast AS caf
SET
number_of_comments = number_of_comments - 1
FROM
post AS p
WHERE
caf.id = p.community_id
AND p.id = OLD.post_id;
ELSIF (TG_OP = 'UPDATE') THEN
DELETE FROM comment_aggregates_fast
WHERE id = OLD.id;
INSERT INTO comment_aggregates_fast
SELECT
*
FROM
comment_aggregates_view
WHERE
id = NEW.id
ON CONFLICT (id)
DO NOTHING;
ELSIF (TG_OP = 'INSERT') THEN
INSERT INTO comment_aggregates_fast
SELECT
*
FROM
comment_aggregates_view
WHERE
id = NEW.id;
-- Update user view due to comment count
UPDATE
user_fast
SET
number_of_comments = number_of_comments + 1
WHERE
id = NEW.creator_id;
-- Update post view due to comment count, new comment activity time, but only on new posts
-- TODO this could be done more efficiently
DELETE FROM post_aggregates_fast
WHERE id = NEW.post_id;
INSERT INTO post_aggregates_fast
SELECT
*
FROM
post_aggregates_view
WHERE
id = NEW.post_id
ON CONFLICT (id)
DO NOTHING;
-- Force the hot rank as zero on week-older posts
UPDATE
post_aggregates_fast AS paf
SET
hot_rank = 0
WHERE
paf.id = NEW.post_id
AND (paf.published < ('now'::timestamp - '1 week'::interval));
-- Update community number of comments
UPDATE
community_aggregates_fast AS caf
SET
number_of_comments = number_of_comments + 1
FROM
post AS p
WHERE
caf.id = p.community_id
AND p.id = NEW.post_id;
END IF;
RETURN NULL;
END
$$;