From cebb368a2809393eebd439991618157c0b4578a2 Mon Sep 17 00:00:00 2001
From: Bernd Bestel <bernd@berrnd.de>
Date: Mon, 27 Sep 2021 17:39:00 +0200
Subject: [PATCH] Enforce min_stock_amount for child products where the parent
 has cumulate_min_stock_amount_of_sub_products enabled (fixes #1595)

---
 migrations/0151.sql | 53 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 migrations/0151.sql

diff --git a/migrations/0151.sql b/migrations/0151.sql
new file mode 100644
index 00000000..6d231e5a
--- /dev/null
+++ b/migrations/0151.sql
@@ -0,0 +1,53 @@
+CREATE TRIGGER enforce_min_stock_amount_for_cumulated_childs_INS AFTER INSERT ON products
+BEGIN
+	/*
+		When a parent product has cumulate_min_stock_amount_of_sub_products enabled,
+		the child should not have any min_stock_amount
+	*/
+
+	UPDATE products
+	SET min_stock_amount = 0
+	WHERE id IN (
+			SELECT
+				p_child.id
+			FROM products p_parent
+			JOIN products p_child
+				ON p_child.parent_product_id = p_parent.id
+			WHERE p_parent.id = NEW.id
+				AND IFNULL(p_parent.cumulate_min_stock_amount_of_sub_products, 0) = 1
+			)
+		AND min_stock_amount > 0;
+END;
+
+CREATE TRIGGER enforce_min_stock_amount_for_cumulated_childs_UPD AFTER UPDATE ON products
+BEGIN
+	/*
+		When a parent product has cumulate_min_stock_amount_of_sub_products enabled,
+		the child should not have any min_stock_amount
+	*/
+
+	UPDATE products
+	SET min_stock_amount = 0
+	WHERE id IN (
+			SELECT
+				p_child.id
+			FROM products p_parent
+			JOIN products p_child
+				ON p_child.parent_product_id = p_parent.id
+			WHERE p_parent.id = NEW.id
+				AND IFNULL(p_parent.cumulate_min_stock_amount_of_sub_products, 0) = 1
+			)
+		AND min_stock_amount > 0;
+END;
+
+UPDATE products
+SET min_stock_amount = 0
+WHERE id IN (
+	SELECT
+		p_child.id
+	FROM products p_parent
+	JOIN products p_child
+		ON p_child.parent_product_id = p_parent.id
+	WHERE IFNULL(p_parent.cumulate_min_stock_amount_of_sub_products, 0) = 1
+	)
+	AND min_stock_amount > 0;