[GitHub] [airflow] kaxil commented on a change in pull request #17565: Add Triggerer warning banner in UI

[GitBox <gi...@apache.org>]

kaxil commented on a change in pull request #17565:
URL: https://github.com/apache/airflow/pull/17565#discussion_r687991180



##########
File path: airflow/jobs/triggerer_job.py
##########
@@ -66,6 +67,15 @@ def register_signals(self) -> None:
         signal.signal(signal.SIGINT, self._exit_gracefully)
         signal.signal(signal.SIGTERM, self._exit_gracefully)
 
+    @provide_session
+    def is_needed(self, session) -> bool:
+        """
+        Tests if the triggerer job needs to be run (i.e., if there are triggers
+        in the trigger table).
+        This is used for the warning boxes in the UI.
+        """
+        return session.query(Trigger).count() > 0

Review comment:
       ```suggestion
           return session.query(func.count(Trigger.id)).scalar() > 0
   ```




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