[jira] [Created] (AIRFLOW-881) Create SubDagOperator within DAG context manager without passing dag param

["Daniel Huang (JIRA)" <ji...@apache.org>]

Daniel Huang created AIRFLOW-881:
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             Summary: Create SubDagOperator within DAG context manager without passing dag param
                 Key: AIRFLOW-881
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-881
             Project: Apache Airflow
          Issue Type: Improvement
          Components: operators, subdag
            Reporter: Daniel Huang
            Assignee: Daniel Huang
            Priority: Trivial


Currently, the following raises a {{Please pass in the `dag` param}} exception:

{code}
with DAG('my_dag', default_args=default_args) as dag:
    op = SubDagOperator(task_id='my_subdag', subdag=subdag_factory(...))
{code}

But the SubDagOperator should be aware if it's in the context manager of a dag without having to specify {{dag=dag}} when initializing the operator. Similar to how the {{@apply_defaults}} decorator does it (https://github.com/apache/incubator-airflow/blob/fb0c5775cda4f84c07d8d5c0e6277fc387c172e6/airflow/utils/decorators.py#L50).



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