[GitHub] [airflow] anneadb opened a new issue, #29102: Airflow UI not showing mapped tasks

[via GitHub]

anneadb opened a new issue, #29102:
URL: https://github.com/apache/airflow/issues/29102

   ### Apache Airflow version
   
   2.5.1
   
   ### What happened
   
   I am using dynamic task mapping to process a list of files in the same way.
   The tasks are generated but I cannot see them listed in the UI tab "Mapped 
Tasks".
   When I go to the graph view I can look at the logs for the last run with all 
mapped instances.
   
   <img width="1147" alt="Screenshot 2023-01-23 at 13 07 59" 
src="https://user-images.githubusercontent.com/46241952/214037237-82381300-11c1-43ce-a4b9-b8f16294a74c.png";>
   
   <img width="975" alt="Screenshot 2023-01-23 at 13 08 07" 
src="https://user-images.githubusercontent.com/46241952/214037258-026d4074-40c5-40a1-96de-74c2bd11173f.png";>
   
   
   ### What you think should happen instead
   
   On the tab "Mapped Tasks" I expect to see a list of the generated tasks with 
links to their logs.
   
   ### How to reproduce
   
   * Use a docker-compose with apache/airflow:2.5.1-python3.8 as the base image.
   * Expand a python operator based on a list of file names from another task
   
   Dag code:
   
   ```
   def prep_args(file_name):
       return {"file_name": file_name}
   
   with DAG(
       "imparted_orders_lascana",
       default_args=default_args,
       schedule="19 */3 * * *",
   ) as dag:
   
       t0 = PythonOperator(
           task_id="get_file_list",
           python_callable=get_file_list,
       )
   
       t1 = PythonOperator.partial(
           task_id="transfer_data",
           python_callable=transfer_data,
       ).expand(op_kwargs=t0.output.map(prep_args))
   
   ```
   
   ### Operating System
   
   CentOS 7.9
   
   ### Versions of Apache Airflow Providers
   
   _No response_
   
   ### Deployment
   
   Docker-Compose
   
   ### Deployment details
   
   We're creating our own docker image based on the provided image to add a few 
additional packages.
   
   The webserver config looks like this:
   
   ```
   from __future__ import annotations
   
   import os
   
   from airflow.www.fab_security.manager import AUTH_DB
   
   basedir = os.path.abspath(os.path.dirname(__file__))
   
   # Flask-WTF flag for CSRF
   WTF_CSRF_ENABLED = True
   
   # The authentication type
   # AUTH_DB : Is for database
   AUTH_TYPE = AUTH_DB
   
   # Uncomment and set to desired role to enable access without authentication
   AUTH_ROLE_PUBLIC = "Admin"
   ```
   
   
   ### 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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