How can I exclude subscription items from discount function?

[Ryoshin]

I've been having quite a few issues with this type of function. The most pressing one right now is that it doesn't seem like I can decide which line items to display the discounts on.

None of my discounts should apply to subscriptions, and I can exclude them from the quantity. The problem is I can't select specifically the variants with no subscription plan in the cart because they all have the same id. So if I have the same product with and without sub it will randomly decide which products to apply it on. How can I effectively exclude subscription lines from the discount?

For example:

4 of Product X with no subs = 25% off
3 of Product X with 30 day sub = no discount
1 of Product X with 14 day sub = no discount

What happens right now is something like:

2 of Product X with no subs = 25% off
2 of Product X with no subs = no discount
1 of Product X with 30 day sub = 25% off
2 of Product X with 30 day sub = no discount
1 of Product X with 14 day sub = 25% off

[Liam]

Hi Ryoshin,

The issue you're encountering is a common one in where a single product has multiple variants with different subscription plans or no subscription at all. You want to apply a discount to only one variant of this product, but currently, the discount is applied randomly to any variant of the product.

Unfortunately, Shopify's discount management system doesn't provide an out-of-the-box solution for specifying which variant of a product should receive the discount. This is because Shopify considers the product as a whole when applying discounts, not the specific variants.

One possible workaround could be to use the Admin API and scripting capabilities to create a more sophisticated discount logic, eg:

1. Identify the Subscription Variants: Using the ProductVariant object with the sellingPlanGroupCount field, you can identify the product variants that are associated with a subscription plan. This will let you know which variants should not receive the discount.

2. Create Custom Logic for Discounts: After identifying the subscription variants, you can create a custom script to apply discounts only to the non-subscription variants of a product. This script can run whenever a customer adds a product to their cart.

3. Apply the Custom Discount Logic: the script to apply your custom discount logic. This script can be triggered when a product is added to the cart or when the customer checks out.

Would an approach like this work for your use case?

[Ryoshin]

I'm not sure what you mean by scripts. Do you mean the function script or shopify scripts which are being deprecated? If it's shopify scripts I did install it on a dev and live stores before it being removed from the store, but would it be a good approach given it's being deprecated?

Right now I can identify which variants are being purchased with and without sub, and I can adjust quantity adequately, but it displays randomly to the customer. So if 3 should be discounted it may show 2 no subs and 1 sub as discounted when all 3 should be no subs.