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Improved search efficiency.

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DebaucheryLibrarian 2023-06-16 00:20:24 +02:00
parent 20f82c4006
commit 6534692b73
1 changed files with 38 additions and 0 deletions
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migrations/20230616000529_search.js Normal file
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exports.up = async (knex) => {
await knex.raw(`
CREATE OR REPLACE FUNCTION curate_search_query(query text) RETURNS tsquery AS $$
SELECT to_tsquery('english', array_to_string(array(SELECT * FROM regexp_matches(query, '[A-Za-zÀ-ÖØ-öø-ÿ0-9]+', 'g')), '|'));
$$ LANGUAGE SQL STABLE;
CREATE OR REPLACE FUNCTION search_releases(query text) RETURNS SETOF releases_search_results AS $$
SELECT results.release_id, ts_rank(results.document::tsvector, curate_search_query(query)) as rank
FROM (
SELECT releases_search.release_id, document
FROM releases_search
WHERE document::tsvector @@ curate_search_query(query)
) AS results
ORDER BY rank DESC;
$$ LANGUAGE SQL STABLE;
COMMENT ON FUNCTION search_releases IS E'@sortable';
`);
};
exports.down = async (knex) => {
await knex.raw(`
CREATE OR REPLACE FUNCTION search_releases(query text) RETURNS SETOF releases_search_results AS $$
SELECT releases.id, ranks.rank FROM (
SELECT
releases_search.release_id,
ts_rank(releases_search.document, to_tsquery('english', array_to_string(array(SELECT * FROM regexp_matches(query, '[A-Za-zÀ-ÖØ-öø-ÿ0-9]+', 'g')), '|'))) AS rank
FROM releases_search
) ranks
LEFT JOIN releases ON releases.id = ranks.release_id
WHERE ranks.rank > 0
ORDER BY ranks.rank DESC;
$$ LANGUAGE SQL STABLE;
DROP FUNCTION curate_search_query;
COMMENT ON FUNCTION search_releases IS E'@sortable';
`);
};