Optimized nested recipe resolving / prevent infinite nested recipes

migrations/0093.sql

@@ -11,9 +11,31 @@ AS (
 	SELECT rn.recipe_id, r1.includes_recipe_id, rn.servings
 	FROM recipes_nestings rn, r1 r1
 	WHERE rn.includes_recipe_id = r1.recipe_id
-	LIMIT 1000000000 -- This is just a safety limit to prevent infinite loops due to infinite nested recipes
 )
 SELECT
 	*,
 	1 AS id -- Dummy, LessQL needs an id column
 FROM r1;
+
+CREATE TRIGGER prevent_self_nested_recipes_INS BEFORE INSERT ON recipes_nestings
+BEGIN
+SELECT CASE WHEN((
+	SELECT 1
+	FROM recipes_nestings
+	WHERE NEW.recipe_id = NEW.includes_recipe_id
+	)
+	NOTNULL) THEN RAISE(ABORT, "Recursive nested recipe detected") END;
+END;
+
+CREATE TRIGGER prevent_self_nested_recipes_UPD BEFORE UPDATE ON recipes_nestings
+BEGIN
+SELECT CASE WHEN((
+	SELECT 1
+	FROM recipes_nestings
+	WHERE NEW.recipe_id = NEW.includes_recipe_id
+	)
+	NOTNULL) THEN RAISE(ABORT, "Recursive nested recipe detected") END;
+END;
+
+DELETE FROM recipes_nestings
+WHERE recipe_id = includes_recipe_id;