as567-code opened a new pull request, #64163:
URL: https://github.com/apache/airflow/pull/64163
## Summary
The `/api/v2/dags/{dag_id}/tasks` endpoint crashes with `TypeError: '<' not
supported between instances of 'NoneType' and 'NoneType'` when sorting by
fields that can be `None` (e.g., `start_date` on unscheduled DAGs).
## Changes
**`airflow-core/src/airflow/api_fastapi/core_api/routes/public/tasks.py`:**
- Added upfront validation of `order_by` against known `TaskResponse` model
fields, returning HTTP 400 with a descriptive error listing valid field names
for invalid values
- Replaced `attrgetter` with a None-safe sort key `(value is None, value)`
that places `None` values last during sorting
- Extended exception handling to catch `TypeError` in addition to
`AttributeError`
**`airflow-core/tests/unit/api_fastapi/core_api/routes/public/test_tasks.py`:**
- Updated existing invalid `order_by` test to match new error message format
- Added test for sorting unscheduled DAG tasks by `start_date` (where values
are `None`)
closes: #63927
---
##### Was generative AI tooling used to co-author this PR?
- [X] Yes — Claude Code (Opus 4.6)
Generated-by: Claude Code (Opus 4.6) following [the
guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions)
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