Enforce a conversion factor of 1 between QU stock/purchase when they are the same (references #1862)

migrations/0189.sql

@@ -0,0 +1,116 @@
+DROP VIEW quantity_unit_conversions_resolved;
+CREATE VIEW quantity_unit_conversions_resolved
+AS
+
+SELECT *
+FROM (
+
+-- 1. Product "purchase to stock" conversion factor
+SELECT
+	-1 AS id, -- Dummy, LessQL needs an id column
+	p.id AS product_id,
+	p.qu_id_purchase AS from_qu_id,
+	qu_from.name AS from_qu_name,
+	qu_from.name_plural AS from_qu_name_plural,
+	p.qu_id_stock AS to_qu_id,
+	qu_to.name AS to_qu_name,
+	qu_to.name_plural AS to_qu_name_plural,
+	CASE WHEN p.qu_id_stock = p.qu_id_purchase THEN 1.0 ELSE p.qu_factor_purchase_to_stock END AS factor, -- Enforce a factor of 1 when QU stock = QU purchase
+	'1 product purchase to stock factor' AS source
+FROM products p
+JOIN quantity_units qu_from
+	ON p.qu_id_purchase = qu_from.id
+JOIN quantity_units qu_to
+	ON p.qu_id_stock = qu_to.id
+UNION -- Inversed
+SELECT
+	-1 AS id, -- Dummy, LessQL needs an id column
+	p.id AS product_id,
+	p.qu_id_stock AS from_qu_id,
+	qu_to.name AS from_qu_name,
+	qu_to.name_plural AS from_qu_name_plural,
+	p.qu_id_purchase AS to_qu_id,
+	qu_from.name AS to_qu_name,
+	qu_from.name_plural AS to_qu_name_plural,
+	1 / p.qu_factor_purchase_to_stock AS factor,
+	'1 product purchase to stock factor (inversed)' AS source
+FROM products p
+JOIN quantity_units qu_from
+	ON p.qu_id_purchase = qu_from.id
+JOIN quantity_units qu_to
+	ON p.qu_id_stock = qu_to.id
+WHERE p.qu_id_stock != p.qu_id_purchase -- => Only when QU stock st not the same as QU purchase
+
+UNION
+
+-- 2. Product specific QU overrides
+SELECT
+	-1 AS id, -- Dummy, LessQL needs an id column
+	p.id AS product_id,
+	quc.from_qu_id AS from_qu_id,
+	qu_from.name AS from_qu_name,
+	qu_from.name_plural AS from_qu_name_plural,
+	quc.to_qu_id AS to_qu_id,
+	qu_to.name AS to_qu_name,
+	qu_to.name_plural AS to_qu_name_plural,
+	quc.factor AS factor,
+	'2 product override' AS source
+FROM products p
+JOIN quantity_unit_conversions quc
+	ON p.id = quc.product_id
+JOIN quantity_units qu_from
+	ON quc.from_qu_id = qu_from.id
+JOIN quantity_units qu_to
+	ON quc.to_qu_id = qu_to.id
+
+UNION
+
+-- 3. Default (direct) QU conversion factors
+SELECT
+	-1 AS id, -- Dummy, LessQL needs an id column
+	p.id AS product_id,
+	p.qu_id_stock AS from_qu_id,
+	qu_from.name AS from_qu_name,
+	qu_from.name_plural AS from_qu_name_plural,
+	quc.to_qu_id AS to_qu_id,
+	qu_to.name AS to_qu_name,
+	qu_to.name_plural AS to_qu_name_plural,
+	quc.factor AS factor,
+	'3 default direct factor' AS source
+FROM products p
+JOIN quantity_unit_conversions quc
+	ON p.qu_id_stock = quc.from_qu_id
+	AND quc.product_id IS NULL
+JOIN quantity_units qu_from
+	ON quc.from_qu_id = qu_from.id
+JOIN quantity_units qu_to
+	ON quc.to_qu_id = qu_to.id
+
+UNION
+
+-- 4. Default (indirect) QU conversion factors
+SELECT
+	-1 AS id, -- Dummy, LessQL needs an id column
+	p.id AS product_id,
+	(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,
+	qu_from.name AS from_qu_name,
+	qu_from.name_plural AS from_qu_name_plural,
+	quc.from_qu_id AS to_qu_id,
+	qu_to.name AS to_qu_name,
+	qu_to.name_plural AS to_qu_name_plural,
+	(SELECT factor FROM quantity_unit_conversions WHERE to_qu_id = quc.to_qu_id AND product_id = p.id) / quc.factor AS factor,
+	'4 default indirect factor' AS source
+FROM products p
+JOIN product_qu_relations pqr
+	ON p.id = pqr.product_id
+JOIN quantity_unit_conversions quc
+	ON pqr.qu_id = quc.from_qu_id
+	AND quc.product_id IS NULL
+JOIN quantity_units qu_from
+	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
+JOIN quantity_units qu_to
+	ON quc.from_qu_id = qu_to.id
+WHERE NOT EXISTS(SELECT 1 FROM quantity_unit_conversions qucx WHERE qucx.product_id = p.id AND qucx.from_qu_id = pqr.qu_id) -- => Product override exists
+
+) x
+ORDER BY source;