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Let me start by saying I am aware of this module: https://www.drupal.org/project/commerce_custom_product

This module works great for custom line item types that need to reference a product, however (correct me if I am wrong) this module can't be used to create custom line item types that do NOT reference a product.

I need a custom line item type, that doesn't reference a product. Which lead to the discovery of this:

http://cgit.drupalcode.org/commerce_examples/tree/line_item_example/line_item_example.module

Utilizing hook_commerce_line_item_type_info() I am able to successfully create a custom line item type, and have it automatically come with the Unit and Total price fields automatically.

All is well so far...

Now if I use the Drupal UI to add a custom field (e.g. an entity reference field, not a product reference field) to this custom line item type, I am able to do this without issue. I can add as many fields as I want.

Now for the problem...

However, when I use the admin order form and try to manually add this custom line item type to an order, the custom field(s) don't show up in the form.

I see from the documentation that I could implement the configuration, add_form and add_form_submit callbacks. But I figured any fields added through the UI would automatically show up on the form(s).

What is going on here? Must I implement the form code-side for all fields on the custom entity type?

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  • There is also the (now "deprecated") module Commerce Custom Line Items (Types). It allows to create line item types without product. Worth to give it a try, and see what to do from there.
    – donquixote
    Commented Oct 24, 2015 at 20:40
  • Sorry, just tried myself, it does not really help. Product reference field still there.
    – donquixote
    Commented Oct 24, 2015 at 21:17
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    It seems you need to manually add widgets for these fields in the add_form callback. Would be nice if we can find a way to automate this.
    – donquixote
    Commented Oct 24, 2015 at 22:18

1 Answer 1

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A line item must have a product associated with it. Rules, Commerce Cart, and Commerce Shipping all depend on having the commerce_product field on a line item object.

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  • From my testing this a 100% true - however why does hook_commerce_line_item_type_info() have a product boolean?
    – Felix Eve
    Commented Sep 9, 2016 at 5:54
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    Because a line can be explicitly defined as not a product. A number of modules do this: commerce_account_balance, commerce_exactor, and commerce_payment_split to name 3. Anything that is a product must have the correct fields (from the docs, re: the product boolean attribute): "If set to TRUE, the line item type must also contain the fields added to the base product line item type, commerce_product".
    – nvahalik
    Commented Sep 9, 2016 at 12:45

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