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-- no more bayesian rating for VN list on tag pages, just plain averages
DROP TABLE tags_vn_bayesian;
CREATE TABLE tags_vn_inherit (
tag integer NOT NULL,
vid integer NOT NULL,
users integer NOT NULL,
rating real NOT NULL,
spoiler smallint NOT NULL
);
CREATE OR REPLACE FUNCTION tag_vn_calc() RETURNS void AS $$
BEGIN
-- all votes for all tags
CREATE OR REPLACE TEMPORARY VIEW tags_vn_all AS
SELECT * FROM tags_vn UNION SELECT * FROM tag_vn_childs();
-- grouped by (tag, vid, uid), so only one user votes on one parent tag per VN entry
CREATE OR REPLACE TEMPORARY VIEW tags_vn_grouped AS
SELECT tag, vid, uid, MAX(vote)::real AS vote, COALESCE(AVG(spoiler), 0)::real AS spoiler
FROM tags_vn_all GROUP BY tag, vid, uid;
-- grouped by (tag, vid) and serialized into a table
DROP INDEX IF EXISTS tags_vn_inherit_tag;
TRUNCATE tags_vn_inherit;
INSERT INTO tags_vn_inherit
SELECT tag, vid, COUNT(uid) AS users, AVG(vote)::real AS rating,
(CASE WHEN AVG(spoiler) < 0.7 THEN 0 WHEN AVG(spoiler) > 1.3 THEN 2 ELSE 1 END)::smallint AS spoiler
FROM tags_vn_grouped
GROUP BY tag, vid
HAVING AVG(vote) > 0;
CREATE INDEX tags_vn_inherit_tag ON tags_vn_inherit (tag);
-- and update the VN count in the tags table as well
UPDATE tags SET c_vns = (SELECT COUNT(*) FROM tags_vn_inherit WHERE tag = id);
RETURN;
END;
$$ LANGUAGE plpgsql;
SELECT tag_vn_calc();
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