Add 'helpers_required_total' metric

shiftregister/metrics/views.py

@@ -1,7 +1,8 @@
-from django.http import HttpResponse
-from shiftregister.app.models import Helper, ShiftRegistration, Message
-from django.db.models import Count, Case, When, Sum
 from django.db import models
+from django.db.models import Count, Case, F, When, Sum
+from django.db.models.functions import Coalesce
+from django.http import HttpResponse
+from shiftregister.app.models import Helper, Shift, ShiftRegistration, Message
 
 
 def metrics(request):
@@ -37,6 +38,16 @@ def metrics(request):
                         .filter(number_validated=True, shift_count__gte=1)
                         .count(),
                     ),
+                    (
+                        "helpers_required_total",
+                        Shift.objects.filter(deleted=False)
+                        .annotate(
+                            real_required_helpers=Coalesce(
+                                F("required_helpers"), F("room__required_helpers")
+                            )
+                        )
+                        .aggregate(sum=Sum("real_required_helpers"))["sum"],
+                    ),
                     (
                         "messages_sent_total",
                         Message.objects.all().count(),