shivaam opened a new issue, #75532:
URL: https://github.com/apache/airflow/issues/75532
### Under which category would you file this issue?
Airflow Core (UI)
### Apache Airflow version
main (`57a4751c967`)
### What happened and how to reproduce it?
- On a Human-in-the-loop request with several options and `multiple=True`,
the Respond button is
enabled with nothing selected.
- Submitting sends an empty `chosen_options`, which the API rejects with 422
(`min_length=1`).
- The form shows only "Response failed / Validation Error". The request
correctly stays pending, and
a later valid answer completes it.
Reproduce:
1. Run `HITLOperator(subject="Pick colours", options=["red", "green",
"blue"], multiple=True)`.
2. Open Required Actions, select nothing, and click Respond.
### What you think should happen instead?
- **Main ask:** the form doesn't let an empty answer through. Respond stays
disabled until at least
one option is chosen, with a short inline hint such as "Select at least
one option". No error is
ever shown for this case, and the fix stays inside
`airflow-core/src/airflow/ui/src/pages/HITLTaskInstances/HITLResponseForm.tsx`.
### Anything else?
- **Why the message is generic:**
- `createErrorToaster` (`ui/src/utils/errorHandling.ts`) shows
`error.message`.
- For the generated API client, that is the OpenAPI description of the 422
response, which
FastAPI always calls "Validation Error".
- The actual reason, in the response body, is never shown. Here it is
"List should have at
least 1 item after validation, not 0".
- **Broader follow-up:** surface the response body's reason in error toasts,
so other 422s on this
form say what was wrong. This can be separate from the fix above.
- The main ask is small and self-contained, which makes it a reasonable
first issue for someone new
to the UI code.
---
Drafted-by: Claude Code (Opus 5.5) (no human review before posting)
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