Fix Duplicate Attendance Scan Confirmation - #468
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July 25, 2026 20:31
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Description
This PR resolves the issue where scanning a participant's QR code resulted in multiple success/error notifications and multiple attendance API requests being triggered for a single scan.
Root Cause
The duplicate confirmations were caused by a combination of:
Stale React closures where the scanner callback captured outdated state values during initialization.
No processing guard, allowing the scanner to invoke the scan callback multiple times per second for the same QR code.
Asynchronous state updates, preventing the scanner from stopping immediately after a successful scan.
Changes Made
AttendancePage.jsx
Testing
Verified successful attendance marking displays a single confirmation.
Verified duplicate API requests are no longer generated for the same QR scan.
Verified scanner recovery after failed scans.
Verified repeated scans of different participants continue to function normally.