GeryDeKocliko opened a new issue, #52622:
URL: https://github.com/apache/airflow/issues/52622
### Apache Airflow version
3.0.2
### If "Other Airflow 2 version" selected, which one?
_No response_
### What happened?
I opened the Trigger Dag form in the Airflow 3 UI and filled in parameters
under the section “Run Parameters” (or under “Advanced Options → Configuration
JSON”).
When I submit the form to backfill a historical date range, the DAG run is
created and executes, but the parameters I entered are not actually passed into
the tasks. Inside the task, references like {{ params.my_param }} or accessing
context["params"]["my_param"] remain unset.
Although the UI shows the parameters form, these values never make it into
the task context.
### What you think should happen instead?
When I trigger a backfill from the Airflow 3 UI and enter parameters in the
Run Parameters or Advanced Options → Configuration JSON, these values should be
passed to each DAG run created during the backfill.
Inside the DAG, I should be able to access them using:
• {{ params.my_param }} in templates
• context["params"]["my_param"] in Python code
This is how it works when triggering a single DAG run from the UI, so the
behavior should be the same for backfills. The parameters entered in the UI
should override the defaults defined in the DAG and be available in all
backfilled runs.
### How to reproduce
1. Create the following DAG:
```
from datetime import datetime
from airflow.decorators import dag, task
from airflow.models.param import Param, ParamsDict
@task
def test_backfill_with_params(params: ParamsDict):
assert params.get("id") is not None
@dag(
dag_id='test_backfill',
start_date=datetime(2023, 1, 1),
schedule='@daily',
catchup=False,
default_args={'owner': 'Gery', 'retries': 0},
params={
"id": Param(default=None, title="My id", description="My id",
type=["null", "string"]),
}
)
def test_backfill_dag():
test_backfill_with_params()
test_backfill_dag()
```
2. Go to the Airflow 3 UI.
3. Open the Backfill modal for the test_backfill DAG.
4. Set a date range (e.g., start and end: 2025-06-01 00:00 and 2025-06-02
00:00).
5. In the Run Parameters section, set id = "1234".
6. Trigger the backfill.
Expected: The DAG run(s) should pass "id": "1234" to the task, and the
assertion should pass.
Actual: The parameter is not passed, and the task fails due to
params.get("id") being None.
### Operating System
Mac OS 14.6 (23G80)
### Versions of Apache Airflow Providers
No providers
### Deployment
Docker-Compose
### Deployment details
_No response_
### Anything else?
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [x] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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