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Simplify _version_from_dag_run #63362

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Merged
pierrejeambrun merged 1 commit into from
Mar 12, 2026
Merged

Simplify _version_from_dag_run #63362

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20 changes: 6 additions & 14 deletions airflow-core/src/airflow/models/dagbag.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,9 +21,8 @@
from typing import TYPE_CHECKING, Any
from uuid import UUID

from sqlalchemy import String, inspect, select
from sqlalchemy import String, select
from sqlalchemy.orm import Mapped, joinedload, mapped_column
from sqlalchemy.orm.attributes import NO_VALUE

from airflow.models.base import Base, StringID
from airflow.models.dag_version import DagVersion
Expand Down Expand Up @@ -66,23 +65,16 @@ def _get_dag(self, version_id: UUID, session: Session) -> SerializedDAG | None:
return self._read_dag(serdag)

@staticmethod
def _version_from_dag_run(dag_run: DagRun, *, session: Session) -> DagVersion | None:
def _version_from_dag_run(dag_run: DagRun, *, session: Session) -> UUID | None:
if not dag_run.bundle_version:
if dag_version := DagVersion.get_latest_version(dag_id=dag_run.dag_id, session=session):
return dag_version
return dag_version.id

# Check if created_dag_version relationship is already loaded to avoid DetachedInstanceError
info: Any = inspect(dag_run)
if info.attrs.created_dag_version.loaded_value is not NO_VALUE:
# Relationship is already loaded, safe to access
return dag_run.created_dag_version

# Relationship not loaded, fetch it explicitly from current session
return session.get(DagVersion, dag_run.created_dag_version_id)
return dag_run.created_dag_version_id

def get_dag_for_run(self, dag_run: DagRun, session: Session) -> SerializedDAG | None:
if version := self._version_from_dag_run(dag_run=dag_run, session=session):
return self._get_dag(version_id=version.id, session=session)
if version_id := self._version_from_dag_run(dag_run=dag_run, session=session):
return self._get_dag(version_id=version_id, session=session)
return None

def iter_all_latest_version_dags(self, *, session: Session) -> Generator[SerializedDAG, None, None]:
Expand Down
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