Add per item amount effects all shipping choices - Rule

If you can boil this down to a simpler situation (just one shipping rate?) and edit the issue summary (just edit the node) to make it as simple as you can, I'll try to take a look at it.

The debugging process means trying to simplify things as much as possible to make it so you understand exactly what's going on and so you can explain it concisely to others.

Thanks!

Still more than I can grok. This will have to be a support request until it's boiled down to a clear statement of something wrong with Commerce Flat Rate instead of something wrong with your application.

As far as I can tell, you don't yet have a condition that limits your rule to acting in the single situation you want it to act in. If you're not familiar with rules components (like subroutines) you may need one of them, with a condition and an action in it, to accomplish some things (especially when something inside a loop needs to have a condition attached to it.)

Sorry, thought I already had. Itangalo's Learn the Rules Framework is the very best. Then the CommerceGuys channel on Vimeo, which you're already familiar with, provides lots of practical examples.

OK, I took a careful look at your work, and it is in fact just a couple of conditions you need. In your shipping "calculation rule", you need conditions that tell it when to fire.

In my case, I made a flat rate type called "Charge Per Item" and added a calculation rule just as in the per-item shipping video, but that rule has to have a couple of conditions added to make sure that it only applies to the correct type of shipping.

FIrst, we do a Data Comparison to check to see if the line item is a shipping line item type.

Then we do a data comparison to make sure that the line item's shipping service is "Charge Per item"

After that, the calculation rule only applies to the service it's supposed to apply to.

When this works out for you, please return to all the places you've posted this and update the actual answer. Thanks!

This post was extremely helpful for me, so I thought I would expand on it a bit to share how I was able to resolve an issue that this method created on my site. Just as in the original post, I wanted to offer two rates, standard and express. Standard is $4 for the first item, and $1 for each additional; Express is $10 for the first, $2 add'l. I also have bulk quantity discount rules in place: buy 10 or more, save 5%; but 20 or more, save 10%; etc. AND I allow the use of coupons on top of the bulk discounts.

The problem with the method offered here is that it tallies ALL of the line items in an order, which includes the discounts and coupons. So an express order for 12 items should have been $32 shipping. Instead, it counted the bulk discount (save 5% on 10 or more) and the coupon (save an additional 10%) as two more items in my cart, for a total of 14 items at $36.

To get around this, I installed Conditional Rules. Then I placed the two actions in the loop (Calculate a Value and Add an Amount to the Unit Price) beneath a conditional (if) statement that first checked to make sure the line items were of the type "product" before including them in the tally (Data Comparison of list-item:type to Products).

Absolute Godsend. Between the video here https://commerceguys.com/blog/using-calculation-rules-add-item-shipping-... and this post, I've now got shipping almost exactly where I want it.

Thank you all.

dave-at-sherpa in #11

Could you possible post the exported rule for me to take a look at please?

I am having trouble getting this to work how you have stated and I'm sure i am going 'rule blind'!

Thanks in advance

#8 was the key I needed.

I have created ​multiple Flat rate Shipping Services​ that set base fee and have User, Country and Role conditions as to wether they apply.
I use additional Calculation Rules to add per item fees to only some shipping line items with conditions as per #8 to limit the additions to the correct shipping line items.

I would to post a solution to a problem I was having when following the suggestions on this post.

On the step of #8

"Then we do a data comparison to make sure that the line item's shipping service is "Charge Per item""

, the select box was empty, although I had several shipping services correctly configured.

That means I could not have the second Data Comparison rule:

 { "data_is" : {
          "data" : [ "commerce-line-item:commerce-shipping-service" ],
          "value" : "charge_per_item"

The value was not available on Rules interface, and even if I hand built the rule and imported, it would not be validated.

So, after some time debuggin I came to the conclusion that was Field Translation module that had problems, under i18n suite.

To make everything work, I had to patch Field Module with:

https://www.drupal.org/project/i18n/issues/1829050#comment-12289963

I hope this can help someone in the future.

Hi there and sorry for bringing this issue up after such a long time. I am trying to figure a way to apply the solution of step #8.
However when i select "data to compare" the selector "commerce-line-iltem:commerce-shipping-service" is not an available option.
I get the error message >
"Data selector commerce-line-item:commerce-shipping-service for parameter data is invalid."
Any ideas?

Hi @aliweng,

Check the link provided by @jrochate. Once the patch applied you shouldn't have any problems.