[GitHub] [airflow] potiuk commented on issue #19477: 'NoneType' object has no attribute 'refresh_from_task' Error when manually running task instance

[GitBox <gi...@apache.org>]

potiuk commented on issue #19477:
URL: https://github.com/apache/airflow/issues/19477#issuecomment-963448627


   Copied from discussion:
   here is some code examples:
   
   ```
   from datetime import datetime
   
   from airflow.operators.python_operator import PythonOperator
   from airflow import DAG
   
   with DAG('a_dag',  schedule_interval=None, default_args={'start_date': datetime(2018, 1, 1, 0, 0, 0)}) as dag:
       def success(*args, **kwargs):
           print('ok')
   
       some_task = PythonOperator(task_id='some_tasks', python_callable=success)
   ```
   
   and with new task
   
   ```
   from datetime import datetime
   
   from airflow.operators.python_operator import PythonOperator
   from airflow import DAG
   
   with DAG('a_dag',  schedule_interval=None, default_args={'start_date': datetime(2018, 1, 1, 0, 0, 0)}) as dag:
       def success(*args, **kwargs):
           print('ok')
   
       some_task = PythonOperator(task_id='some_tasks', python_callable=success)
       new_task = PythonOperator(task_id='new_task', python_callable=success)
   and steps to reproduce:
   ```
   1. Define "a_dag" with "some_tasks".
   2. Create dag run (manually or by schedule)
   3. Add "new_task" into dag, deploy code
   4. Select "new_task" in UI and press "Run" button
   


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