Can't execute the UpdateOperation on cart

Retired Boards Appdev Functions
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Topic summary

A developer encountered an error while attempting to update a cart line’s price using the UpdateOperation in a Shopify function extension.

Error Details:

  • The operation failed with: “Field is not defined on UpdateOperation”
  • Error path pointed to: [“operations”, 0, “update”, “price”]
  • Despite the error, the expected output appeared correctly in STDOUT

Resolution:

  • The issue was resolved by adding api_version = "unstable" to the shopify.extension.toml configuration file
  • This suggests the UpdateOperation feature or specific field support requires the unstable API version to function properly
Summarized with AI on November 15. AI used: claude-sonnet-4-5-20250929.
2

Its working after I’ve added the the following to shopify.extension.toml file

api_version = “unstable”

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