Stop the starter code appearing twice when the owner picks a problem - #74
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When the owner picked a problem with a partner in the room, the partner heard about the problem before the owner's insert arrived, saw an empty document and inserted the starter too, so both saw it twice. Now only the owner writes it, or the partner when the owner is not in the room.
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📝 WalkthroughWalkthroughThe room view selects which client may seed starter code. The collaborative editor tracks that selection and requires it before inserting starter code into an empty, unseeded shared document. ChangesStarter-code seeding
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~8 minutes Change: Bug fix Merge Risk: 🔵 Low · up to Starter code can still appear twice in a room with multiple participants after the owner leaves. The extra copy can be removed manually, but electing one fallback writer would close this gap. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@apps/web/src/routes/rooms/RoomView.tsx`:
- Line 442: Update the writesStarter condition in RoomView so the owner remains
the writer when present, and when absent only the member with the lowest userId
in a deterministic ordering writes the starter; keep other members from
inserting duplicate starter text.
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ℹ️ Review info
⚙️ Run configuration
Configuration used: defaults
Review profile: CHILL
Plan: Advanced
Run ID: 9291169b-4554-4b1b-bbf2-26caf51898e8
📒 Files selected for processing (2)
apps/web/src/components/CollaborativeEditor.tsxapps/web/src/routes/rooms/RoomView.tsx
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What and why
When the owner picked a problem while a partner was in the room, both people ended up with two copies of the starter code in the editor.
The problem-change event reaches the partner over the room socket before the owner's inserted text arrives over the editor socket. The partner's editor sees an empty document at that moment and inserts the starter code as well, and Yjs keeps both inserts. Switching problems already avoided this by letting only the owner replace the text. Filling an empty document had no such rule.
The fix applies the same rule: only one client writes the starter code into an empty document. That client is the owner's. When the owner isn't in the room, it's the member with the lowest user id, so every client agrees on one writer without coordinating, and someone alone still gets the starter code. It's the new
writesStarterprop onCollaborativeEditor.Rooms that already have the duplicate keep it. Delete the extra copy, or open a new room.
How this was verified
These runs used Playwright against the local stack, with two signed-in dev accounts in separate browsers, reading the editor text from Monaco in each browser:
npm run lintandnpm run buildpass.Summary by CodeRabbit