What happened?

Description

Not sure if this is a bug or just changed in Craft Commerce 5.

But the qty in the populateLineItem event (https://craftcms.com/docs/commerce/5.x/extend/events.html#populatelineitem) is always 1.
We used the populateLineItem to calculate a new salePrice depending on how many items the customer bought.

Since updating from Craft 3 tot Craft 5 I've noticed that this new salePrice is wrong, so after a little investigating I found out that the qty in the event is always 1.

Probably because the default is set to 1: https://github.com/craftcms/commerce/blob/5.3.1/src/services/LineItems.php#L432

• And the new qty is never passed to this function as parameters in https://github.com/craftcms/commerce/blob/5.3.1/src/controllers/CartController.php#L172C72-L172C87
• Also see https://github.com/craftcms/commerce/blob/5.3.1/src/services/LineItems.php#L194

If this is just changed and not a bug anymore, which event do we need to use to calculate a new salePrice depending on custom Logic?

Steps to reproduce

1. Add the populateLineItem in a module and log the qty.
2. Add a product to the cart with qty higher then.
3. The log shows that the qty is always 1, even when you add for example 5 products.

Expected behavior

The qty in the populateLineItem is greater then 1.

Actual behavior

The log shows that the qty is always 1, even when you add for example 5 products.

Craft CMS version

5.6.4

Craft Commerce version

5.3.1

PHP version

8.3

Operating system and version

Mac os

Database type and version

Mysql 8

Image driver and version

No response

Installed plugins and versions