paperwork: Allow exempting departments from having a mailing list

paperwork/admin.py

@@ -18,7 +18,13 @@ from .certification_emails import all_certification_emails
 @admin.register(Department)
 class Department(admin.ModelAdmin):
     search_fields = ["name"]
-    list_display = ["name", "parent", "list_moderator_flag", "list_reply_to_address"]
+    list_display = [
+        "name",
+        "parent",
+        "has_mailing_list",
+        "list_moderator_flag",
+        "list_reply_to_address",
+    ]
 
 
 class CertificationVersionInline(admin.TabularInline):

paperwork/api.py

@@ -28,7 +28,7 @@ class DepartmentViewSet(viewsets.ModelViewSet):
         Generate a mailing list for each department, containing all
         certified users for tools in that department or child departments
         """
-        departments = self.queryset.prefetch_related(
+        departments = self.queryset.filter(has_mailing_list=True).prefetch_related(
             "children",
             "list_moderator_flag",
             Prefetch(

paperwork/migrations/0007_department_has_mailing_list.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.1.3 on 2023-01-19 21:02
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("paperwork", "0006_department_alter_certificationdefinition_department"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="department",
+            name="has_mailing_list",
+            field=models.BooleanField(default=False),
+        ),
+    ]

paperwork/models.py

@@ -59,6 +59,7 @@ class Department(models.Model):
     parent = models.ForeignKey(
         "self", on_delete=models.PROTECT, related_name="children", blank=True, null=True
     )
+    has_mailing_list = models.BooleanField(default=False)
     list_moderator_flag = models.ForeignKey(
         MembershipWorksFlag,
         on_delete=models.PROTECT,