tirkarthi commented on issue #62988:
URL: https://github.com/apache/airflow/issues/62988#issuecomment-4016907165
Agree with @jroachgolf84 that this could be a documentation improvement.
Following dag works as expected.
```python
from __future__ import annotations
from airflow.providers.standard.operators.python import get_current_context
from airflow.providers.standard.operators.trigger_dagrun import
TriggerDagRunOperator
from airflow.sdk import dag, task
@dag()
def gh62988_child_dag():
@task
def run():
return "hello world"
run()
@dag()
def gh62988_top_dag():
@task
def postprocess(trigger_task):
context = get_current_context()
print(context["task_instance"])
child_run_id =
context["task_instance"].xcom_pull(task_ids="trigger_dag", key="trigger_run_id")
print(f"{child_run_id = }")
child_dag_return_value = context["task_instance"].xcom_pull(
dag_id="gh62988_child_dag", task_ids="run", run_id=child_run_id
)
print(f"{child_dag_return_value = }")
if not child_dag_return_value == "hello world":
raise ValueError(f"child dag return_value
{child_dag_return_value}")
t_trigger = TriggerDagRunOperator(
task_id="trigger_dag", trigger_dag_id="gh62988_child_dag",
wait_for_completion=True
)
postprocess(t_trigger.output)
gh62988_top_dag()
gh62988_child_dag()
```
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