pierrejeambrun commented on code in PR #42973:
URL: https://github.com/apache/airflow/pull/42973#discussion_r1802557782


##########
airflow/api_fastapi/routes/public/dag_run.py:
##########
@@ -57,3 +57,19 @@ async def delete_dag_run(dag_id: str, dag_run_id: str, 
session: Annotated[Sessio
         )
 
     session.delete(dag_run)
+
+
+@dag_run_router.patch("/{dag_run_id}", 
responses=create_openapi_http_exception_doc([400, 401, 403, 404]))
+async def modify_dag_run(
+    dag_id: str, dag_run_id: str, state: DAGRunPatchBody, session: 
Annotated[Session, Depends(get_session)]
+) -> DAGRunResponse:
+    """Modify a DAG Run."""
+    dag_run = session.scalar(select(DagRun).filter_by(dag_id=dag_id, 
run_id=dag_run_id))
+    if dag_run is None:
+        raise HTTPException(
+            404, f"The DagRun with dag_id: `{dag_id}` and run_id: 
`{dag_run_id}` was not found"
+        )
+
+    setattr(dag_run, "state", state.state)
+

Review Comment:
   Cf the legacy implementation. Setting a DagRun state has side effect and 
should be using the utility functions `set_dag_run_state_to_success`, 
`set_dag_run_state_to_queued`, etc... We cannot just set the `DagRun.state` 
value in the db. (because of tasks dependencies etc...)
   
   Also we should also use the DagBag for consistency



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