Add response_activity_count in event api

Author: k9845

api/drf_views.py

@@ -11,6 +11,7 @@
 from django.db import models
 from django.db.models import Prefetch, Count, Q
 from django.utils import timezone
+from django.db.models.functions import Coalesce
 
 from main.utils import is_tableau
 from deployments.models import Personnel
@@ -120,6 +121,8 @@
 )
 from .logger import logger
 
+from deployments.models import EmergencyProject
+
 
 class DeploymentsByEventViewset(viewsets.ReadOnlyModelViewSet):
     serializer_class = DeploymentsByEventSerializer