fix(availability): don't offer round-robin slots when a fixed host has no free time by shanto462 · Pull Request #30328 · calcom/cal.diy

shanto462 · 2026-10-09T12:37:39Z

What does this PR do?

Round-robin events with a fixed host offered slots even when the fixed host had no free time in the requested range. Booking one of those slots then failed with FixedHostsUnavailableForBooking.

In getAggregatedAvailability, the fixed-host constraint was only added when fixedDateRanges was not empty, so "fixed hosts exist but have no common free time" was treated the same as "no fixed hosts". The check now uses fixedHosts.length, so an empty fixed range stays a constraint and intersect returns no availability. This matches the booking-time rule in RegularBookingService (all fixed hosts must be available).

The bug only shows when the fixed hosts have no common free time in the whole requested range, for example a fixed host blocked on the only day requested, out of office for the whole month, or two fixed hosts whose hours never overlap. One busy day inside a month view was already handled. Personal events and dynamic group links are not affected, since all their users are already marked as fixed.

Same approach as the earlier #29797 and #29837, which were closed as stale without review.

Fixes [bug]: round-robin events offer bookable slots when a mandatory fixed host is unavailable #29800

Visual Demo (For contributors especially)

Backend only, so no UI change. Local check against the slots endpoint (slots/getSchedule, seeded round-robin-seeded-team-event, teampro set as fixed host with an all-day unavailable date override on 2026-10-14, request for that day):

Before: 32 slots offered (from the other round-robin hosts)
After: no slots

Mandatory Tasks (DO NOT REMOVE)

I have self-reviewed the code (A decent size PR without self-review might be rejected).
I have updated the developer docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox. N/A
I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

Unit tests: TZ=UTC yarn vitest run packages/features/availability/lib/getAggregatedAvailability. The two new cases (fixed host fully busy, two fixed hosts with no common time) fail before the change and pass after.
Manual, with the seed data and no extra env vars:
1. Set one host of round-robin-seeded-team-event as a fixed host.
2. Give that host an all-day "unavailable" date override on a weekday.
3. Request slots for only that day (slots/getSchedule with eventTypeId, isTeamEvent: true, start and end of that day).
4. Expected: no slots. Before this change, the other hosts' slots were returned.
No change when there are no fixed hosts, or when the fixed hosts have common free time.

…s no free time

github-actions · 2026-10-09T12:37:48Z

Welcome to Cal.diy, @shanto462! Thanks for opening this pull request.

A few things to keep in mind:

This is Cal.diy, not Cal.com. Cal.diy is a community-driven, fully open-source fork of Cal.com licensed under MIT. Your changes here will be part of Cal.diy — they will not be deployed to the Cal.com production app.
Please review our Contributing Guidelines if you haven't already.
Make sure your PR title follows the Conventional Commits format.

A maintainer will review your PR soon. Thanks for contributing!

coderabbitai · 2026-10-09T12:41:18Z

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 39a9624 and f1191b3.

📒 Files selected for processing: 1

packages/features/availability/lib/getAggregatedAvailability/getAggregatedAvailability.ts

🚧 Files skipped from review as they are similar to previous changes: 1

packages/features/availability/lib/getAggregatedAvailability/getAggregatedAvailability.ts

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📝 Walkthrough

In round-robin mode, getAggregatedAvailability now retains the fixed-host constraint whenever fixed hosts exist, including when their intersected availability is empty. Two tests cover an unavailable fixed host and non-overlapping availability across fixed hosts while round-robin hosts remain available.

Priority: ➖ Normal

Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to f1191

Round-robin events with an unavailable fixed host will no longer offer slots that fail at booking. No actionable merge risk remains.

Pre-merge checks: 5

Check name	Status	Explanation
Title check		The title clearly identifies the availability bug and the fix for round-robin slots when a fixed host has no free time.
Description check		The description directly explains the bug, implementation change, affected scope, tests, and expected behavior.
Linked Issues check		The PR satisfies [`#29800`]. `getAggregatedAvailability` now keeps the fixed-host constraint when `fixedHosts.length` is non-zero, including an empty fixed-host intersection. The added tests cover one f…
Out of Scope Changes check		The PR changes only `getAggregatedAvailability` and its focused tests. Both changes directly support [`#29800`]. No unrelated change is shown.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…

Full details: Linked Issues check

Explanation

The PR satisfies [#29800]. getAggregatedAvailability now keeps the fixed-host constraint when fixedHosts.length is non-zero, including an empty fixed-host intersection. The added tests cover one fully unavailable fixed host and multiple fixed hosts with no common availability. These cases return no slots when a round-robin host remains available.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2 files.

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Actionable comments posted: 1

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Inline comments:
Review comments at
@packages/features/availability/lib/getAggregatedAvailability/getAggregatedAvailability.test.ts:
- Around line 495-496: Remove the fixture-description comments from the test
near the no-common-time case; the test name and input already convey the
availability ranges. Keep the test input and behavior unchanged.

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packages/features/availability/lib/getAggregatedAvailability/getAggregatedAvailability.test.ts
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github-actions · 2026-10-18T00:38:13Z

This PR has been marked as stale due to inactivity. If you're still working on it or need any help, please let us know or update the PR to keep it active.

fix(availability): don't offer round-robin slots when a fixed host ha…

44bfe21

…s no free time

pull-request-size Bot added the size/M label Oct 9, 2026

github-actions Bot added Stale 🐛 bug Something isn't working labels Oct 9, 2026

shanto462 marked this pull request as ready for review October 9, 2026 12:38

coderabbitai Bot reviewed Oct 9, 2026

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Comment thread packages/features/availability/lib/getAggregatedAvailability/getAggregatedAvailability.test.ts Resolved

test(availability): remove comments that restate the test data

94f7ec9

github-actions Bot removed the Stale label Oct 10, 2026

github-actions Bot added the Stale label Oct 18, 2026

Merge branch 'main' into fix-rr-busy-fixed-host-slots

39a9624

kart1ka added run-ci Approve CI to run for external contributors and removed Stale labels Oct 18, 2026

kart1ka previously approved these changes Oct 18, 2026

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refactor(availability): keep only the why in fixed-host guard comment

f1191b3

kart1ka dismissed their stale review via f1191b3 October 18, 2026 10:19

github-actions Bot added the Stale label Oct 18, 2026

kart1ka approved these changes Oct 18, 2026

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kart1ka removed the Stale label Oct 18, 2026

kart1ka enabled auto-merge (squash) October 18, 2026 10:23

kart1ka added run-ci Approve CI to run for external contributors and removed run-ci Approve CI to run for external contributors labels Oct 18, 2026

kart1ka disabled auto-merge October 18, 2026 10:26

kart1ka merged commit 6bfe2df into calcom:main Oct 18, 2026
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sahitya-chandra mentioned this pull request Nov 11, 2026

fix(ci): restore CI for fork PRs and fail required when prepare fails #30564

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fix(availability): don't offer round-robin slots when a fixed host has no free time - #30328

fix(availability): don't offer round-robin slots when a fixed host has no free time#30328
kart1ka merged 4 commits into
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shanto462:fix-rr-busy-fixed-host-slots

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shanto462 commented Oct 9, 2026

What does this PR do?

Visual Demo (For contributors especially)

Mandatory Tasks (DO NOT REMOVE)

How should this be tested?

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