A user encountered an error when trying to access product metafields (specifically a metaobject type) within Shopify Flow using Liquid code. The code worked correctly on the front-end but failed in Flow with the error message: “‘dress’ is invalid. Replace this variable.”
Key Issue:
product.metafields.dress.neck.value) doesn’t work the same way in Flow as it does in theme LiquidSolution Provided:
Resolution: The issue was resolved with the metafield alias configuration method.
The type of this metafield is metaobject
metafield： product.metafields.dress.neck.value
metaobject fields：neck.type ， neck.img
My code is：
{% capture neck_tags %}
{% for neck_type in product.metafields.dress.neck.value %}
{{ neck_type.type.value }}{% unless forloop.last %},{% endunless %}
{% endfor %}
{% endcapture %}
{{ neck_tags }}
Flow error message: “dress” is invalid. Replace this variable.
This code works normally in front-end test.
I don’t know what to do…
Hi @Elvin_s
I asked GPT and here is the answer hope can solve your issue
https://chatgpt.com/share/67ff066a-fb80-800e-bc73-02c91a0314b7
thank you.
The code provided by GPT is the same as mine. actually I’ve tried gpt and claude.
My guess is that the shopify flow pairs have limited support for metaobjects，
But I can’t be sure of this
Liquid in flow is not quite the same as in theme.
If I am not mistaken, you had to loop over all metafields in Flow liquid to match namespace and key to get the metafield you want, there were no direct access. (https://community.shopify.com/c/shopify-flow-app/unable-to-access-any-shop-metafields-values-from-within-a-flow/m-p/1781225/highlight/true#M1034)
But now you may rather configure metafield alias in Flow to access metafield faster.
https://help.shopify.com/en/manual/shopify-flow/concepts/metafields
https://changelog.shopify.com/posts/shopify-flow-access-typed-metafields
You saved me！