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