paperwork: Add deskers mailing list

This behaves much more correctly, although may not have ideal performance

membershipworks/models.py

@@ -3,7 +3,7 @@ from typing import Optional
 import django.core.mail.message
 from django.conf import settings
 from django.db import models
-from django.db.models import Q, Count, BooleanField
+from django.db.models import Exists, OuterRef
 
 
 class Flag(models.Model):
@@ -21,14 +21,17 @@ class Flag(models.Model):
 
 
 class MemberQuerySet(models.QuerySet):
+    # TODO: maybe rename to reflect EXISTS?
     @staticmethod
     def has_flag(flag_type: str, flag_name: str):
-        return Count(
-            "uid",
-            filter=Q(flags__name=flag_name, flags__type=flag_type),
-            output_field=BooleanField(),
-        )
+        return Exists(Flag.objects.filter(
+            type=flag_type,
+            name=flag_name,
+            members=OuterRef("pk")
+        ))
 
+    # TODO: it should be fairly easy to reduce the number of EXISTS by
+    # merging the ORed flags
     def with_is_active(self):
         return self.annotate(
             is_active=(

paperwork/api.py

@@ -1,5 +1,5 @@
-from django.db.models import Prefetch
 from rest_framework import routers, serializers, viewsets
+from django.db.models import Prefetch, Q
 from rest_framework.decorators import action
 from rest_framework.response import Response
 
@@ -59,10 +59,10 @@ class DepartmentViewSet(viewsets.ModelViewSet):
             lists[department.list_name] = {
                 "config": {
                     "real_name": department.list_name,
-                    "moderator": moderator_emails,
                     "subject_prefix": f"[CMS {department.name}] ",
                     "reply_to_address": department.list_reply_to_address,
                 },
+                "moderators": moderator_emails,
                 "members": active_certified_members,
             }
 
@@ -98,6 +98,21 @@ class DepartmentViewSet(viewsets.ModelViewSet):
             },
         }
 
+        # TODO: this isn't really in the domain of the `paperwork` app...
+        deskers = (
+            Member.objects.with_is_active()
+            .filter(is_active=True)
+            .filter(
+                Member.objects.has_flag("label", "Volunteer: Desker")
+                | Q(billing_method__startswith="Desker")
+            )
+        )
+        lists["Deskers"] = {
+            "members": {
+                desker.sanitized_mailbox(use_volunteer=True) for desker in deskers
+            }
+        }
+
         return Response(lists)