tutortool/docs/issues_discovered_20260504.md

Issues Discovered - 2026-05-04

This document summarizes the issues found during the Playwright exploration session on 2026-05-04.

1. JSON Parse Error when adding Tutors to Courses

• Location: frontend/src/routes/admin/courses/+page.svelte (triggered by api.admin.courses.addTutor)
• Symptoms: Alert box shows SyntaxError: Failed to execute 'json' on 'Response': Unexpected end of JSON input.
• Root Cause: The backend POST /api/admin/courses/:id/tutors handler likely returns a 200 OK with an empty body. The frontend api.ts wrapper attempts to call .json() on every response, which fails on empty bodies.
• Evidence: Network request #48 in Playwright session showed status: 200 but content-length: 0.

2. Attendance Count Missing on Student Check-in Page

• Location: frontend/src/routes/s/[code]/+page.svelte
• Symptoms: The "Anwesende" count shows 0 / 11 even after a successful check-in or when other students are present.
• Root Cause: The loadInfo function fetches the data but never assigns res.attendances to the local attendances state variable.
• Evidence: loadInfo contains const checkinAttendances = res.attendances ?? []; but lacks attendances = checkinAttendances;.

3. Seat Map Empty in Live View

• Location: frontend/src/routes/admin/live/[slotId]/+page.svelte
• Symptoms: All seats show as "frei" in the tutor's live view, even when students are checked in and assigned to seats.
• Root Cause: The SeatMap component is instantiated without passing assignments or students props.
• Evidence: <SeatMap variant="tutor" scale={0.78} /> is used without other props in the source code.

4. Room Editor Element Selection Broken

• Location: frontend/src/lib/RoomCanvas.svelte
• Symptoms: Clicking an element in the Room Layout Editor does not select it (sidebar continues to show "Element auswählen").
• Root Cause: In handleMouseDown, if editable is true, the function returns early without calling onElementClick.
• Evidence:

  function handleMouseDown(e: MouseEvent, el: LayoutElement) {
      if (!editable) {
          onElementClick?.(el);
          return;
      }
      draggingId = el.id;
      // ...
  }
  

5. Potential UI/UX: Dashboard Slot Status

• Observation: Dashboard sometimes shows "Anwesenheit offen" but "Alle Slots 1" and "Abgeschlossene Slots 0". It's a bit confusing if there is only one slot ever. (Minor)