prefetch_related on PeriodicTaskQuerySet.enabled issue:#608

Author: jahazieldom

django_celery_beat/querysets.py

@@ -6,4 +6,6 @@ class PeriodicTaskQuerySet(models.QuerySet):
     """QuerySet for PeriodicTask."""
 
     def enabled(self):
-        return self.filter(enabled=True)
+        return self.filter(enabled=True).prefetch_related(
+            "interval", "crontab", "solar", "clocked"
+        )