Implemented "default consume location" handling (closes #1365)

migrations/0187.sql

@@ -0,0 +1,55 @@
+ALTER TABLE products
+ADD default_consume_location_id INTEGER;
+
+DROP VIEW stock_next_use;
+CREATE VIEW stock_next_use
+AS
+
+/*
+	The default consume rule is:
+	Opened first, then first due first, then first in first out
+	Apart from that products at their default consume location should be consumed first
+
+	This orders the stock entries by that
+	=> Highest "priority" per product = the stock entry to use next
+*/
+
+SELECT
+	(ROW_NUMBER() OVER(PARTITION BY s.product_id ORDER BY CASE WHEN IFNULL(p.default_consume_location_id, -1) = s.location_id THEN 0 ELSE 1 END ASC, s.open DESC, s.best_before_date ASC, s.purchased_date ASC)) * -1 AS priority,
+	s.*
+FROM stock s
+JOIN products p
+	ON p.id = s.product_id;
+
+CREATE TRIGGER stock_next_use_INS INSTEAD OF INSERT ON stock_next_use
+BEGIN
+	INSERT INTO stock
+		(product_id, amount, best_before_date, purchased_date, stock_id,
+		price, open, opened_date, location_id, shopping_location_id, note)
+	VALUES
+		(NEW.product_id, NEW.amount, NEW.best_before_date, NEW.purchased_date, NEW.stock_id,
+		NEW.price, NEW.open, NEW.opened_date, NEW.location_id, NEW.shopping_location_id, NEW.note);
+END;
+
+CREATE TRIGGER stock_next_use_UPD INSTEAD OF UPDATE ON stock_next_use
+BEGIN
+	UPDATE stock
+	SET product_id = NEW.product_id,
+	amount = NEW.amount,
+	best_before_date = NEW.best_before_date,
+	purchased_date = NEW.purchased_date,
+	stock_id = NEW.stock_id,
+	price = NEW.price,
+	open = NEW.open,
+	opened_date = NEW.opened_date,
+	location_id = NEW.location_id,
+	shopping_location_id = NEW.shopping_location_id,
+	note = NEW.note
+	WHERE id = NEW.id;
+END;
+
+CREATE TRIGGER stock_next_use_DEL INSTEAD OF DELETE ON stock_next_use
+BEGIN
+	DELETE FROM stock
+	WHERE id = OLD.id;
+END;