Dashboard - Remove pre-hook logic from alert.py.

dashboard/dashboard/associate_alerts.py

Index: dashboard/dashboard/associate_alerts.py
diff --git a/dashboard/dashboard/associate_alerts.py b/dashboard/dashboard/associate_alerts.py
index d7842a8c57b4b5bb937af1de9d647ee44e6dca65..5f2948be0cd979e4c4ec6468e9ab8fdc415be319 100644
--- a/dashboard/dashboard/associate_alerts.py
+++ b/dashboard/dashboard/associate_alerts.py
@@ -12,6 +12,7 @@ from google.appengine.ext import ndb
 from dashboard import oauth2_decorator
 from dashboard.common import request_handler
 from dashboard.common import utils
+from dashboard.models import alert_group
 from dashboard.models import anomaly
 from dashboard.models import stoppage_alert
 from dashboard.services import issue_tracker_service
@@ -125,9 +126,7 @@ class AssociateAlertsHandler(request_handler.RequestHandler):
         })
         return
 
-    for a in alert_entities:
-      a.bug_id = bug_id
-    ndb.put_multi(alert_entities)
+    alert_group.ModifyAlertsAndAssociatedGroups(alert_entities, bug_id=bug_id)
 
     self.RenderHtml('bug_result.html', {'bug_id': bug_id})