Fix UnboundLocalError in checkout endpoint (ANDROID-DN)

[cursor]

Summary

Fixed an UnboundLocalError in the Flask backend's /checkout endpoint that was causing HTTP 500 responses and triggering downstream errors in the Android app.

Problem

The quantities variable was being referenced in len(quantities) before it was assigned from cart['quantities']. This caused an UnboundLocalError that resulted in:

1. Flask backend returning HTTP 500 error
2. Android app receiving the error and throwing a MainFragment$BackendAPIException: Failed to init delivery workflow

Solution

Moved the assignment of quantities from cart['quantities'] to occur before the empty cart check.

Code Changes

Before:

if len(quantities) == 0:  # ❌ quantities not yet defined
    raise Exception("Invalid checkout request: cart is empty")

quantities = {int(k): v for k, v in cart['quantities'].items()}

After:

quantities = {int(k): v for k, v in cart['quantities'].items()}
if len(quantities) == 0:  # ✅ quantities now defined
    raise Exception("Invalid checkout request: cart is empty")

Testing

• Verified Python syntax with python3 -m py_compile
• The fix ensures the checkout flow will proceed correctly when inventory validation is enabled

Fixes ANDROID-DN

  

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
empower	Ignored		Mar 24, 2026 6:05pm

[idosun]

@sentry review

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 22.01%. Comparing base (a6c2e0f) to head (060a664).
✅ 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    #1379   +/-   ##
=======================================
  Coverage   22.01%   22.01%           
=======================================
  Files          42       42           
  Lines        1363     1363           
  Branches      176      175    -1     
=======================================
  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)