Clamp cart amount when variant changes to respect sellable quantity

[mnindrazaka]

Summary

When a menu item variant is changed, the cart amount is now automatically clamped to the new variant's sellable quantity if the current amount exceeds it. This prevents users from adding more items than available for the newly selected variant.

Changes

• Extracted amount-clamping logic into a reusable clampAmountToVariant helper function that respects a variant's sellableQuantity and ensures a minimum of 1
• Applied clamping when a variant is selected via SELECT_OPTION_VALUE action, in addition to the existing clamping on CHANGE_AMOUNT
• Added two test cases:
  • Verifies amount is lowered when switching to a variant with lower sellable quantity
  • Verifies amount is preserved when it already fits within the new variant's limit

Implementation Details

The clampAmountToVariant function centralizes the clamping logic: it caps the amount to the variant's sellableQuantity (if the variant is sellable) and enforces a minimum of 1. This same logic now applies both when the user manually changes the amount and when the variant selection changes.

https://claude.ai/code/session_01ENqaKMvnNmmmqsbqBo4MJr

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3 Skipped Deployments

Project	Deployment	Actions	Updated
gatherloop-order	Ignored		Oct 3, 2026 10:07am UTC
gatherloop-pos	Ignored		Oct 3, 2026 10:07am UTC
gatherloop-ui-storybook	Ignored		Oct 3, 2026 10:07am UTC