Need to set tags=[] to remove all tags from a DAG.

[ReadytoRocc]

Apache Airflow version

2.2.3 (latest released)

What happened

When removing the tags argument from a DAG, the tags are not removed. You need to set tags=[] to remove them.

What you expected to happen

I would expect that if you remove the tags argument from the DAG definition, all tags would be removed from the DAG.

How to reproduce

Add tags=["foo"] to your DAG definition, and then remove the argument entirely. The DAG should still have tag foo in the UI. You should see the tag removed once you set tags=[].

Operating System

Debian GNU/Linux 11 (bullseye)

Versions of Apache Airflow Providers

No response

Deployment

Other Docker-based deployment

Deployment details

Astronomer CLI Docker based deployment.

Anything else

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[PApostol]

I think this has already been fixed on main by changing self.tags = tags to self.tags = tags or [] in airflow/models/dag.py (the change is not in Airflow 2.2.3 though). Can you check the issue against main?

[potiuk]

Oh yeah. Some nice side-effect of Our #19891 quest with MyPY.

It's been fixed here:

#20272

@ReadytoRocc - I am closing the issue now - but if you could double-check if it is really fixed, it would be great.

(we can always re-open the issue if you find it's not fixed).

[ReadytoRocc]

@PApostol @potiuk confirmed that this is working as expected on main. Thanks!

[potiuk]

@PApostol @potiuk confirmed that this is working as expected on main. Thanks!

Glad to hear!

[EugeneChung]

You can remove tags from the dag_tag table or you can truncate the table because all of the tags will be regenerated.