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-- another fix in the calculation of the tags_vn_bayesian.spoiler column
CREATE OR REPLACE FUNCTION tag_vn_calc() RETURNS void AS $$
BEGIN
-- all votes for all tags
CREATE OR REPLACE TEMPORARY VIEW tags_vn_all AS
SELECT * FROM tags_vn UNION SELECT * FROM tag_vn_childs();
-- grouped by (tag, vid, uid), so only one user votes on one parent tag per VN entry
CREATE OR REPLACE TEMPORARY VIEW tags_vn_grouped AS
SELECT tag, vid, uid, MAX(vote)::real AS vote, COALESCE(AVG(spoiler), 0)::real AS spoiler
FROM tags_vn_all GROUP BY tag, vid, uid;
-- grouped by (tag, vid) and serialized into a table
DROP INDEX IF EXISTS tags_vn_bayesian_tag;
TRUNCATE tags_vn_bayesian;
INSERT INTO tags_vn_bayesian
SELECT tag, vid, COUNT(uid) AS users, AVG(vote)::real AS rating,
(CASE WHEN AVG(spoiler) < 0.7 THEN 0 WHEN AVG(spoiler) > 1.3 THEN 2 ELSE 1 END)::smallint AS spoiler
FROM tags_vn_grouped
GROUP BY tag, vid
HAVING AVG(vote) > 0;
CREATE INDEX tags_vn_bayesian_tag ON tags_vn_bayesian (tag);
-- now perform the bayesian ranking calculation
UPDATE tags_vn_bayesian tvs SET rating =
((SELECT AVG(users)::real * AVG(rating)::real FROM tags_vn_bayesian WHERE tag = tvs.tag) + users*rating)
/ ((SELECT AVG(users)::real FROM tags_vn_bayesian WHERE tag = tvs.tag) + users)::real;
-- and update the VN count in the tags table as well
UPDATE tags SET c_vns = (SELECT COUNT(*) FROM tags_vn_bayesian WHERE tag = id);
RETURN;
END;
$$ LANGUAGE plpgsql;
SELECT tag_vn_calc();
-- releases_rev.minage should accept NULL
ALTER TABLE releases_rev ALTER COLUMN minage DROP NOT NULL;
ALTER TABLE releases_rev ALTER COLUMN minage DROP DEFAULT;
UPDATE releases_rev SET minage = NULL WHERE minage < 0;
-- wikipedia link for producers
ALTER TABLE producers_rev ADD COLUMN l_wp varchar(150);
-- bayesian rating
CREATE OR REPLACE VIEW vn_ratings AS
SELECT vid, COUNT(uid) AS votecount, (
((SELECT COUNT(vote)::real/COUNT(DISTINCT vid)::real FROM votes)*(SELECT AVG(vote)::real FROM votes) + SUM(vote)::real) /
((SELECT COUNT(vote)::real/COUNT(DISTINCT vid)::real FROM votes) + COUNT(uid)::real)
) AS rating
FROM votes
GROUP BY vid;
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