Order Printer template - display product collections

Shopify Apps
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Topic summary

A developer is attempting to display product collections in a custom Order Printer template but encountering issues with the Liquid code.\n\nProblem Details:\n- Three debug attempts all fail:\n - {{line_item.product | json}} returns \

Summarized with AI on November 12. AI used: claude-sonnet-4-5-20250929.
1

Hi All,

I’m trying to display the product’s collections on a custom Order Printer template. But I get nothing or errors.

{% for line_item in line_items %}
  <!-- 1. debug --> 
  {{line_item.product | json}}

  <!-- 2. debug -->
  {{line_item.product.collections.first | json}}

  <!-- 3. output collections -->
  <p>Collections: {% for coll in line_item.product.collections %}{{coll.title}}{% endfor %}</p>
{% endfor %}

  1. outputs Liquid error: internal

  2. outputs Liquid error: internal

  3. outputs Collections:

This suggests to me that the Order Printer liquid is different to the normal Shopify liquid API and that the product object of line_item doesn’t include collections like the api suggests. Does anyone know if this is true? or am I missing something with my code?

I also can’t explain why 1. doesn’t work. any thoughts?

Many thanks

2

Hey, perhaps if no one knows the answer to getting the collections, does anyone know why my debug isn’t working?

… Or what the schema is for the Order Printer template objects?

If I can find out what props are available to me, I can take it from there. But I can’t figure out a way of finding out what props i have.

Cheers