lemmy/migrations/2020-12-03-035643_create_user_aggregates/up.sql

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-- Add user aggregates
CREATE TABLE user_aggregates (
id serial PRIMARY KEY,
user_id int REFERENCES user_ ON UPDATE CASCADE ON DELETE CASCADE NOT NULL,
post_count bigint NOT NULL DEFAULT 0,
post_score bigint NOT NULL DEFAULT 0,
comment_count bigint NOT NULL DEFAULT 0,
comment_score bigint NOT NULL DEFAULT 0,
UNIQUE (user_id)
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);
INSERT INTO user_aggregates (user_id, post_count, post_score, comment_count, comment_score)
SELECT
u.id,
coalesce(pd.posts, 0),
coalesce(pd.score, 0),
coalesce(cd.comments, 0),
coalesce(cd.score, 0)
FROM
user_ u
LEFT JOIN (
SELECT
p.creator_id,
count(DISTINCT p.id) AS posts,
sum(pl.score) AS score
FROM
post p
LEFT JOIN post_like pl ON p.id = pl.post_id
GROUP BY
p.creator_id) pd ON u.id = pd.creator_id
LEFT JOIN (
SELECT
c.creator_id,
count(DISTINCT c.id) AS comments,
sum(cl.score) AS score
FROM
comment c
LEFT JOIN comment_like cl ON c.id = cl.comment_id
GROUP BY
c.creator_id) cd ON u.id = cd.creator_id;
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-- Add user aggregate triggers
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-- initial user add
CREATE FUNCTION user_aggregates_user ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
IF (TG_OP = 'INSERT') THEN
INSERT INTO user_aggregates (user_id)
VALUES (NEW.id);
ELSIF (TG_OP = 'DELETE') THEN
DELETE FROM user_aggregates
WHERE user_id = OLD.id;
END IF;
RETURN NULL;
END
$$;
CREATE TRIGGER user_aggregates_user
AFTER INSERT OR DELETE ON user_
FOR EACH ROW
EXECUTE PROCEDURE user_aggregates_user ();
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-- post count
CREATE FUNCTION user_aggregates_post_count ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
IF (TG_OP = 'INSERT') THEN
UPDATE
user_aggregates
SET
post_count = post_count + 1
WHERE
user_id = NEW.creator_id;
ELSIF (TG_OP = 'DELETE') THEN
UPDATE
user_aggregates
SET
post_count = post_count - 1
WHERE
user_id = OLD.creator_id;
-- If the post gets deleted, the score calculation trigger won't fire,
-- so you need to re-calculate
UPDATE
user_aggregates ua
SET
post_score = pd.score
FROM (
SELECT
u.id,
coalesce(0, sum(pl.score)) AS score
-- User join because posts could be empty
FROM
user_ u
LEFT JOIN post p ON u.id = p.creator_id
LEFT JOIN post_like pl ON p.id = pl.post_id
GROUP BY
u.id) pd
WHERE
ua.user_id = OLD.creator_id;
END IF;
RETURN NULL;
END
$$;
CREATE TRIGGER user_aggregates_post_count
AFTER INSERT OR DELETE ON post
FOR EACH ROW
EXECUTE PROCEDURE user_aggregates_post_count ();
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-- post score
CREATE FUNCTION user_aggregates_post_score ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
IF (TG_OP = 'INSERT') THEN
-- Need to get the post creator, not the voter
UPDATE
user_aggregates ua
SET
post_score = post_score + NEW.score
FROM
post p
WHERE
ua.user_id = p.creator_id
AND p.id = NEW.post_id;
ELSIF (TG_OP = 'DELETE') THEN
UPDATE
user_aggregates ua
SET
post_score = post_score - OLD.score
FROM
post p
WHERE
ua.user_id = p.creator_id
AND p.id = OLD.post_id;
END IF;
RETURN NULL;
END
$$;
CREATE TRIGGER user_aggregates_post_score
AFTER INSERT OR DELETE ON post_like
FOR EACH ROW
EXECUTE PROCEDURE user_aggregates_post_score ();
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-- comment count
CREATE FUNCTION user_aggregates_comment_count ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
IF (TG_OP = 'INSERT') THEN
UPDATE
user_aggregates
SET
comment_count = comment_count + 1
WHERE
user_id = NEW.creator_id;
ELSIF (TG_OP = 'DELETE') THEN
UPDATE
user_aggregates
SET
comment_count = comment_count - 1
WHERE
user_id = OLD.creator_id;
-- If the comment gets deleted, the score calculation trigger won't fire,
-- so you need to re-calculate
UPDATE
user_aggregates ua
SET
comment_score = cd.score
FROM (
SELECT
u.id,
coalesce(0, sum(cl.score)) AS score
-- User join because comments could be empty
FROM
user_ u
LEFT JOIN comment c ON u.id = c.creator_id
LEFT JOIN comment_like cl ON c.id = cl.comment_id
GROUP BY
u.id) cd
WHERE
ua.user_id = OLD.creator_id;
END IF;
RETURN NULL;
END
$$;
CREATE TRIGGER user_aggregates_comment_count
AFTER INSERT OR DELETE ON comment
FOR EACH ROW
EXECUTE PROCEDURE user_aggregates_comment_count ();
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-- comment score
CREATE FUNCTION user_aggregates_comment_score ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
IF (TG_OP = 'INSERT') THEN
-- Need to get the post creator, not the voter
UPDATE
user_aggregates ua
SET
comment_score = comment_score + NEW.score
FROM
comment c
WHERE
ua.user_id = c.creator_id
AND c.id = NEW.comment_id;
ELSIF (TG_OP = 'DELETE') THEN
UPDATE
user_aggregates ua
SET
comment_score = comment_score - OLD.score
FROM
comment c
WHERE
ua.user_id = c.creator_id
AND c.id = OLD.comment_id;
END IF;
RETURN NULL;
END
$$;
CREATE TRIGGER user_aggregates_comment_score
AFTER INSERT OR DELETE ON comment_like
FOR EACH ROW
EXECUTE PROCEDURE user_aggregates_comment_score ();
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