kaxil commented on a change in pull request #12586:
URL: https://github.com/apache/airflow/pull/12586#discussion_r530020374



##########
File path: airflow/models/serialized_dag.py
##########
@@ -73,8 +73,7 @@ class SerializedDagModel(Base):
 
     dag_runs = relationship(
         DagRun,
-        primaryjoin=dag_id == DagRun.dag_id,
-        foreign_keys=dag_id,
+        primaryjoin=dag_id == foreign(DagRun.dag_id),

Review comment:
       Looks like the CI failed with following error:
   
   ```
   sqlalchemy.exc.InvalidRequestError: One or more mappers failed to initialize 
- can't proceed with initialization of other mappers. Triggering mapper: 
'mapped class SerializedDagModel->serialized_dag'. Original exception was: 
Could not locate any relevant foreign key columns for primary join condition 
'serialized_dag.dag_id = dag_run.dag_id' on relationship 
SerializedDagModel.dag_runs.  Ensure that referencing columns are associated 
with a ForeignKey or ForeignKeyConstraint, or are annotated in the join 
condition with the foreign() annotation.
   ```
   
   So indeed it looks like we do need `foreign` 




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