traxxx/migrations/20220716223422_random_campa...

59 lines
1.7 KiB
JavaScript
Executable File

exports.up = async (knex) => Promise.resolve()
.then(() => knex.schema.createTable('random_campaign', (table) => {
table.text('banner_id')
.references('id')
.inTable('banners');
table.text('url');
table.integer('entity_id')
.references('id')
.inTable('entities');
table.string('affiliate_id')
.references('id')
.inTable('affiliates');
table.integer('parent_id')
.references('id')
.inTable('entities');
}))
.then(() => knex.raw(`
ALTER TABLE banners ADD COLUMN ratio numeric GENERATED ALWAYS AS (ROUND(width::decimal/ height::decimal, 2)) STORED;
`))
.then(() => knex.raw(`
DROP FUNCTION IF EXISTS get_random_campaign;
DROP FUNCTION IF EXISTS banners_ratio;
CREATE FUNCTION get_random_campaign(min_ratio decimal default 0, max_ratio decimal default 1000.0) RETURNS random_campaign AS $$
SELECT * FROM (
SELECT DISTINCT ON (CASE WHEN parent_id IS NOT NULL THEN parent_id ELSE entity_id END)
banner_id, url, entity_id, affiliate_id, parent_id
FROM (
SELECT
campaigns.*, entities.parent_id as parent_id
FROM campaigns
LEFT JOIN entities ON entities.id = campaigns.entity_id
LEFT JOIN banners ON banners.id = campaigns.banner_id
WHERE banner_id IS NOT NULL
AND ratio >= min_ratio
AND ratio <= max_ratio
ORDER BY RANDOM()
) random_campaigns
) random_banners
ORDER BY RANDOM()
LIMIT 1;
$$ LANGUAGE SQL STABLE;
`));
exports.down = async (knex) => knex.raw(`
DROP FUNCTION IF EXISTS get_random_campaign;
DROP TABLE IF EXISTS random_campaign;
ALTER TABLE banners DROP COLUMN ratio;
CREATE FUNCTION banners_ratio(banner banners) RETURNS numeric AS $$
SELECT ROUND(banner.width::decimal / banner.height::decimal, 2);
$$ LANGUAGE SQL STABLE;
`);