[5.x]: Discount don't work if custom price calculation for lineItem

[WHITE-developer]

What happened?

Description

We have created a custom price calculation for a project, in where you can order a product (a fabric in this case) per meter. So in craft the variant has the price for 1m as the defaultPrice (say $20,-), and when people order this fabric, they fill in the amount of meters they want (for example 2m). Then the lineitem is saved as qty 1 and an option in where the length 2m is saved. We also calculate the price for this lineItem as 2 * the default price (2 * $20 = $40 in this case).

This works fine. But now our client has created a discount code, which only has to work if the total order amount is over $100,-.

And now it doesn't apply the discount, because i think it uses the purchasable price * the quantity.

For example, a customer has ordered 6m of the fabric and has a order of $120,- now. They should get the discount, because the order amount is over $100,-. But they discount isn't subtracted. Only when I add 6x 1m of this fabric in the cart, I get the discount.

Expected behavior

If i have a lineItem with the total price over the amount set in the discount, it should apply the discount

Actual behavior

Craft CMS version

5.5.7

Craft Commerce version

5.2.10

PHP version

8.3.8

Operating system and version

No response

Database type and version

No response

Image driver and version

No response

Installed plugins and versions

[linear]

PT-2457 [5.x]: Discount don't work if custom price calculation for lineItem

[lukeholder]

@WHITE-developer Could you share the following (OR you can email this to [email protected] if you would prefer, just reference this issue number):

• How are you doing the custom price calculation? Are you using an event?
• Can you screenshot the discount rule? Is it based on the total item price or the total order price?

It might be easier to email us your database with the IDs of the cart affected, along with the product and discount IDs.

Let us know. Thanks!

[WHITE-developer]

@lukeholder i've mailed your support.