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104 lines
3.0 KiB
SQL
104 lines
3.0 KiB
SQL
DROP VIEW quantity_unit_conversions_resolved;
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CREATE VIEW quantity_unit_conversions_resolved
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AS
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-- 1. Product "purchase to stock" conversion factor
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SELECT
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-1 AS id, -- Dummy, LessQL needs an id column
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p.id AS product_id,
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p.qu_id_purchase AS from_qu_id,
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qu_from.name AS from_qu_name,
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qu_from.name_plural AS from_qu_name_plural,
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p.qu_id_stock AS to_qu_id,
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qu_to.name AS to_qu_name,
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qu_to.name_plural AS to_qu_name_plural,
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p.qu_factor_purchase_to_stock AS factor
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FROM products p
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JOIN quantity_units qu_from
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ON p.qu_id_purchase = qu_from.id
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JOIN quantity_units qu_to
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ON p.qu_id_stock = qu_to.id
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UNION -- Inversed
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SELECT
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-1 AS id, -- Dummy, LessQL needs an id column
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p.id AS product_id,
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p.qu_id_stock AS from_qu_id,
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qu_to.name AS from_qu_name,
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qu_to.name_plural AS from_qu_name_plural,
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p.qu_id_purchase AS to_qu_id,
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qu_from.name AS to_qu_name,
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qu_from.name_plural AS to_qu_name_plural,
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1 / p.qu_factor_purchase_to_stock AS factor
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FROM products p
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JOIN quantity_units qu_from
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ON p.qu_id_purchase = qu_from.id
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JOIN quantity_units qu_to
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ON p.qu_id_stock = qu_to.id
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UNION
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-- 2. Product specific QU overrides
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SELECT
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-1 AS id, -- Dummy, LessQL needs an id column
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p.id AS product_id,
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quc.from_qu_id AS from_qu_id,
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qu_from.name AS from_qu_name,
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qu_from.name_plural AS from_qu_name_plural,
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quc.to_qu_id AS to_qu_id,
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qu_to.name AS to_qu_name,
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qu_to.name_plural AS to_qu_name_plural,
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quc.factor AS factor
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FROM products p
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JOIN quantity_unit_conversions quc
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ON p.id = quc.product_id
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JOIN quantity_units qu_from
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ON quc.from_qu_id = qu_from.id
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JOIN quantity_units qu_to
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ON quc.to_qu_id = qu_to.id
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UNION
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-- 3. Default (direct) QU conversion factors
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SELECT
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-1 AS id, -- Dummy, LessQL needs an id column
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p.id AS product_id,
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p.qu_id_stock AS from_qu_id,
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qu_from.name AS from_qu_name,
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qu_from.name_plural AS from_qu_name_plural,
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quc.to_qu_id AS to_qu_id,
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qu_to.name AS to_qu_name,
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qu_to.name_plural AS to_qu_name_plural,
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quc.factor AS factor
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FROM products p
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JOIN quantity_unit_conversions quc
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ON p.qu_id_stock = quc.from_qu_id
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AND quc.product_id IS NULL
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JOIN quantity_units qu_from
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ON quc.from_qu_id = qu_from.id
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JOIN quantity_units qu_to
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ON quc.to_qu_id = qu_to.id
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UNION
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-- 4. Default (indirect) QU conversion factors
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SELECT
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-1 AS id, -- Dummy, LessQL needs an id column
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p.id AS product_id,
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(SELECT from_qu_id FROM quantity_unit_conversions WHERE to_qu_id = quc.to_qu_id AND product_id = p.id) AS from_qu_id,
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qu_from.name AS from_qu_name,
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qu_from.name_plural AS from_qu_name_plural,
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quc.from_qu_id AS to_qu_id,
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qu_to.name AS to_qu_name,
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qu_to.name_plural AS to_qu_name_plural,
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quc.factor * (SELECT factor FROM quantity_unit_conversions WHERE to_qu_id = quc.to_qu_id AND product_id = p.id) AS factor
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FROM products p
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JOIN product_qu_relations pqr
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ON p.id = pqr.product_id
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JOIN quantity_unit_conversions quc
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ON pqr.qu_id = quc.from_qu_id
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AND quc.product_id IS NULL
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JOIN quantity_units qu_from
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ON (SELECT from_qu_id FROM quantity_unit_conversions WHERE to_qu_id = quc.to_qu_id AND product_id = p.id) = qu_from.id
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JOIN quantity_units qu_to
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ON quc.from_qu_id = qu_to.id;
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