Shopify flow

Shopify Plus

Topic summary

A user is attempting to auto-populate custom product metafields using Shopify Flow, specifically trying to extract color information (like “Black”) from product titles and automatically fill it into a Cross Channel Metafield for color. The automation isn’t functioning as expected.

Troubleshooting guidance provided:

  • The most common error involves incorrectly defining the namespace and key in the “Update product metafield” action
  • In metafield definitions (Settings > Custom data), the namespace appears before the period (“.”) and the key appears after it
  • More configuration details are needed to diagnose the specific issue

The discussion remains open, awaiting additional information about the Flow configuration to identify the root cause.

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

Hey,

I have created custom product metafields. And I want to try autofill them. I have tried setting it up so the colour from the title gets picked up, then autofilled into the metafield. In this case, Black getting added to Cross Channel Metafield colour as Black. However it is not working. Any ideas? Thanks

2

To answer this question you need to provide more information about how you’ve configured the Update product metafield action. The most common mistake people make is not properly defining the namespace and key. In the metafield definition (under Settings > Custom data) the namespace is the part before the period (“.”) and the key is the part after (see example).