Quick and Dirty Coupon with Custom Line Item and Rules (Screencast)

Tonight I needed a coupon on one product on a site that only sells one product. I didn't really want to deploy and configure Commerce Coupon, so I just did it with a quick combination of a line item field and a rule.

Here's what I did:

1. Add a "coupon" field to the line item
2. Create a product pricing rule that checks to see that when the right product is in the line item and the right value is in the coupon field, apply a discount. (The rule is attached to this article.)

That's it.

Here's the screencast.