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https://issues.apache.org/jira/browse/AIRFLOW-5500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17147776#comment-17147776
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ASF subversion and git services commented on AIRFLOW-5500:
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Commit e1b4fcfa7eba4fa3fd0af00242e1809f7ae75a04 in airflow's branch 
refs/heads/v1-10-test from Charles Bournhonesque
[ https://gitbox.apache.org/repos/asf?p=airflow.git;h=e1b4fcf ]

[AIRFLOW-5500] Fix the trigger_dag api in the case of nested subdags

Co-authored-by: Charles Bournhonesque <charles.bournhones...@benevolent.ai>
(cherry picked from commit 16e06f802b30ce7c3972b1a8165e3d6327dee761)


> Bug in trigger api endpoint 
> ----------------------------
>
>                 Key: AIRFLOW-5500
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-5500
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: api
>    Affects Versions: 1.10.1
>            Reporter: Deavarajegowda M T
>            Priority: Critical
>         Attachments: 3level.py
>
>
> Unable to trigger workflow with nested sub dags, getting following error:
>  sqlalchemy.exc.IntegrityError: (psycopg2.IntegrityError) duplicate key value 
> (dag_id,execution_date)=('dummy.task1.task_level1.task_level2','2019-09-10 
> 13:00:27+00:00') violates unique constraint 
> "dag_run_dag_id_execution_date_key"
>  trigger_dag for nested sub_dags is called twice.
>  
> fix:
> in airflow/api/common/experimental/trigger_dag.py -
> while populating subdags for a dag, each subdag's subdags is also populated 
> to main dag.
> So no need to repopulate subdags for each subdag separately.



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