Remove ambient situation references from endpoints without situationIds

[soumajitgh]

Four endpoints return service-alert situations even though their response data contains no situationIds, leaving clients without a way to associate those alerts with response objects. Remove this ambient alert population from route, search/route, search/stop, and stops-for-location so references.situations remains [], including when applicable alerts exist.

Agency, route, and parent-stop references are preserved. Endpoints that emit explicit situationIds retain their existing situation-reference logic. This follows the contract clarified in #1421 and the maintainer's closing comment on #1411.

Regression coverage seeds matching route/stop alerts for all four endpoints, checks empty arrays rather than null, and verifies normal response data and other references. Updated the existing tests that required ambient situations, including the stops-for-location includeReferences cases. All four endpoint regressions failed against the original handlers before the fix.

Validation passed:

• go test -tags 'sqlite_fts5 sqlite_math_functions' ./...
• go vet -tags 'sqlite_fts5 sqlite_math_functions' ./...
• go test -tags purego ./internal/restapi
• git diff --check

Closes #1421

Summary by CodeRabbit

• Behavior Changes

  • Route, stop search, and nearby-stop responses no longer include ambient situation references.
  • Agency and route references continue to be provided where applicable.
  • Responses remain consistent even when matching alerts exist for returned routes or stops.

• Bug Fixes

  • Prevented unrelated alerts from appearing in route and stop search results.

[coderabbitai]

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Review configuration:

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Team

Run ID: a6434120-a1d8-4eb3-b11f-ff25ddb2d22b

📥 Commits

Reviewing files that changed from the base of the PR and between 308f571 and f4b812a.

📒 Files selected for processing (4)

• internal/restapi/route_handler_test.go
• internal/restapi/route_search_handler_test.go
• internal/restapi/search_stops_handler_test.go
• internal/restapi/stops_for_location_handler_test.go

📝 Walkthrough

Walkthrough

Four REST endpoints no longer populate ambient references.situations from matching alerts. Their tests seed alerts and verify empty situation references while preserving route, stop, agency, and parent-stop references.

Changes

Ambient situation reference removal

Layer / File(s)	Summary
Route endpoint reference handling internal/restapi/route_handler.go, internal/restapi/route_search_handler.go, internal/restapi/*route*_test.go	Route and route-search responses no longer collect alert situations. Tests verify empty situation references and preserve route and agency references.
Stop search reference handling internal/restapi/search_stops_handler.go, internal/restapi/search_stops_handler_test.go	Stop search retains kept-stop reference filtering but no longer adds alert situations. Tests verify empty situation references for an alerted stop.
Location-based stop reference handling internal/restapi/stops_for_location_handler.go, internal/restapi/stops_for_location_handler_test.go	Stops-for-location responses no longer collect alert situations. Tests verify empty situation references while retaining agency and route references.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to 308f5

These endpoints now return empty situation reference arrays when response data has no situation IDs, while preserving applicable non-situation references. The behavioral change is covered by alert-bearing regression tests; only a minor documentation-convention issue remains before merge.

Possibly related PRs

• OneBusAway/maglev#1402: Both changes remove alert-derived situation references from REST endpoint responses.

Suggested reviewers: burma-shave, arcoder181105

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 8 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: removing ambient situation references from endpoints that do not return situationIds.
Linked Issues check	✅ Passed	The changes implement issue #1421 for all four affected endpoints. They remove ambient situation population, preserve other references, and add regression coverage that expects empty situation arrays …
Out of Scope Changes check	✅ Passed	The changes are limited to the four affected handlers and their tests. No unrelated code or behavior changes are present.

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Actionable comments posted: 1

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Inline comments:
In `@internal/restapi/route_search_handler_test.go`:
- Line 272: Add Go doc comments starting with
TestRouteSearchHandlerOmitsAmbientSituations in
internal/restapi/route_search_handler_test.go:272-272 and
TestStopsForLocationHandlerOmitsAmbientSituations in
internal/restapi/stops_for_location_handler_test.go:555-555.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Team

Run ID: a6397df8-5c85-4e84-9ea9-8269d69b125c

📥 Commits

Reviewing files that changed from the base of the PR and between fe8b0e1 and 308f571.

📒 Files selected for processing (8)

• internal/restapi/route_handler.go
• internal/restapi/route_handler_test.go
• internal/restapi/route_search_handler.go
• internal/restapi/route_search_handler_test.go
• internal/restapi/search_stops_handler.go
• internal/restapi/search_stops_handler_test.go
• internal/restapi/stops_for_location_handler.go
• internal/restapi/stops_for_location_handler_test.go

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[omlahore]

vehicles-for-agency looks like it has the same shape and it is not in this PR. It still does the ambient populate in vehicles_for_agency_handler.go, and the TripStatus there is built with models.NewTripStatus() rather than BuildTripStatus, so situationIds never gets filled. Seeding a route alert against the RABA fixture gives references.situations of 1 while the vehicle's tripStatus.situationIds is [], which I think is the case #1421 is trying to remove. Its two situation tests assert the current behaviour so they would have to move with it.

Smaller thing, collectAlertsForStops has no callers left once this lands. collectAlertsForRoutes is still used by the vehicles handler so that one stays either way.