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Support indirect QU conversions (fixes #1217)

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This commit is contained in:
Bernd Bestel
2020-12-24 15:07:04 +01:00
parent 2e3c237648
commit 590cbd2460
3 changed files with 155 additions and 1 deletions
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153
migrations/0126.sql Normal file
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CREATE VIEW quantity_units_resolved
AS
-- This view builds the relationship between QUs based on their (default) conversions
SELECT
-1 AS id, -- Dummy, LessQL needs an id column
qu.id AS qu_id,
quc.to_qu_id AS related_qu_id,
quc.factor
FROM quantity_units qu
JOIN quantity_unit_conversions quc
ON qu.id = quc.from_qu_id
AND quc.product_id IS NULL;
CREATE VIEW product_qu_relations
AS
-- This view builds which product is related to which QU, direct or indirect, based on QU conversions
-- The products stock QU
SELECT
-1 AS id, -- Dummy, LessQL needs an id column
p.id AS product_id,
p.qu_id_stock AS qu_id
FROM products p
UNION
-- The products purchase QU
SELECT
-1 AS id, -- Dummy, LessQL needs an id column
p.id AS product_id,
p.qu_id_purchase AS qu_id
FROM products p
UNION
-- All (direct) product conversions (product overrides)
SELECT
-1 AS id, -- Dummy, LessQL needs an id column
quc.product_id,
quc.to_qu_id AS qu_id
FROM quantity_unit_conversions quc
WHERE quc.product_id IS NOT NULL
UNION
-- All (indirect) default QU conversions
SELECT
-1 AS id, -- Dummy, LessQL needs an id column
p.id AS product_id,
qur2.qu_id
from products p
JOIN quantity_unit_conversions quc
ON (p.qu_id_stock = quc.from_qu_id OR p.qu_id_purchase = quc.from_qu_id)
AND p.id = quc.product_id
JOIN quantity_units_resolved qur1
ON quc.to_qu_id = qur1.qu_id
JOIN quantity_units_resolved qur2
ON qur1.related_qu_id = qur2.qu_id;
DROP VIEW quantity_unit_conversions_resolved;
CREATE VIEW quantity_unit_conversions_resolved
AS
-- 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,
p.qu_id_stock AS to_qu_id,
qu_to.name AS to_qu_name,
p.qu_factor_purchase_to_stock AS factor
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,
p.qu_id_purchase AS to_qu_id,
qu_from.name AS to_qu_name,
1 / p.qu_factor_purchase_to_stock AS factor
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
-- 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,
quc.to_qu_id AS to_qu_id,
qu_to.name AS to_qu_name,
quc.factor AS factor
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,
quc.to_qu_id AS to_qu_id,
qu_to.name AS to_qu_name,
quc.factor AS factor
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,
quc.from_qu_id AS to_qu_id,
qu_to.name AS to_qu_name,
quc.factor * (SELECT factor FROM quantity_unit_conversions WHERE to_qu_id = quc.to_qu_id AND product_id = p.id) AS factor
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;