Fix NameError in /checkout endpoint - define quantities before use

[cursor]

Summary

Fixes FRONTEND-REACT-6B1

This PR fixes a critical bug in the Flask backend's /checkout endpoint that was causing HTTP 500 errors during checkout.

Problem

The quantities variable was being used in a conditional check (line 225) before it was defined (line 228), causing a NameError exception when validate_inventory was true.

Solution

Moved the quantities definition before its usage in the validation logic.

Changes

• flask/src/main.py: Reordered lines 225-228 to define quantities before checking its length

Testing

The fix resolves the NameError that was preventing successful checkout operations. The checkout flow now properly:

1. Defines the quantities dictionary from cart data
2. Validates that the cart is not empty
3. Proceeds with inventory validation

Related Issues

• Fixes issue FRONTEND-REACT-6B1: Error: 500 - Internal Server Error (occurred in: /checkout-form)

  

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
empower	Ignored		Mar 25, 2026 7:04pm

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 22.01%. Comparing base (4272cc5) to head (43c0271).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
flask/src/main.py	0.00%	1 Missing ⚠️

❌ Your project check has failed because the head coverage (22.01%) is below the target coverage (35.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1382   +/-   ##
=======================================
  Coverage   22.01%   22.01%           
=======================================
  Files          42       42           
  Lines        1363     1363           
  Branches      176      176           
=======================================
  Hits          300      300           
  Misses       1036     1036           
  Partials       27       27           

Flag	Coverage Δ
api	5.82% <0.00%> (ø)
frontend	32.37% <ø> (ø)

Components	Coverage Δ
checkout_module	5.82% <0.00%> (ø)
product_component	26.03% <ø> (ø)

Files with missing lines	Coverage Δ
flask/src/main.py	0.00% <0.00%> (ø)