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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
);
-- more efficient version of tag_vn_calc()
CREATE OR REPLACE FUNCTION tag_vn_calc() RETURNS void AS $$
BEGIN
DROP INDEX IF EXISTS tags_vn_inherit_tag_vid;
TRUNCATE tags_vn_inherit;
-- populate tags_vn_inherit
INSERT INTO tags_vn_inherit
-- all votes for all tags, including votes inherited by child tags
-- (also includes meta tags, because they could have a normal tag as parent)
WITH RECURSIVE tags_vn_all(lvl, tag, vid, uid, vote, spoiler, meta) AS (
SELECT 15, tag, vid, uid, vote, spoiler, false
FROM tags_vn
UNION ALL
SELECT lvl-1, tp.parent, ta.vid, ta.uid, ta.vote, ta.spoiler, t.meta
FROM tags_vn_all ta
JOIN tags_parents tp ON tp.tag = ta.tag
JOIN tags t ON t.id = tp.parent
WHERE t.state = 2
AND ta.lvl > 0
)
-- grouped by (tag, vid)
SELECT tag, vid, COUNT(uid) AS users, AVG(vote)::real AS rating,
(CASE WHEN AVG(spoiler) < 0.7 THEN 0 WHEN AVG(spoiler) > 1.3 THEN 2 ELSE 1 END)::smallint AS spoiler
FROM (
-- grouped by (tag, vid, uid), so only one user votes on one parent tag per VN entry (also removing meta tags)
SELECT tag, vid, uid, MAX(vote)::real, COALESCE(AVG(spoiler), 0)::real
FROM tags_vn_all
WHERE NOT meta
GROUP BY tag, vid, uid
) AS t(tag, vid, uid, vote, spoiler)
GROUP BY tag, vid
HAVING AVG(vote) > 0;
-- recreate index
CREATE INDEX tags_vn_inherit_tag_vid ON tags_vn_inherit (tag, vid);
-- and update the VN count in the tags table
UPDATE tags SET c_vns = (SELECT COUNT(*) FROM tags_vn_inherit WHERE tag = id);
RETURN;
END;
$$ LANGUAGE plpgsql;
SELECT tag_vn_calc();
-- remove unused functions
DROP FUNCTION tag_vn_childs() CASCADE;
DROP FUNCTION tag_tree(integer, integer, boolean);
DROP TYPE tag_tree_item;
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