UPD: change grace period for purging registration and participant data.

dav_events/utils.py

@@ -2,11 +2,21 @@ import logging
 from django.apps import apps
 from django.contrib.auth import get_user_model
 from django.contrib.auth.models import Group
-from django.db.models import Q
+from django.utils import timezone
+
+# from .models import Participant
 
 app_config = apps.get_containing_app_config(__package__)
 logger = logging.getLogger(__name__)
 
+
+# def purge_participants():
+#     now = timezone.now()
+#     for p in Participant.objects.filter(purge_at__lte=now):
+#         logger.info('Purge participant \'%s\'', p)
+#         p.delete()
+
+
 # TODO: most of the functions here are auth stuff.
 
 
@@ -65,14 +75,3 @@ def has_role(user, role):
     if group_names and user.groups.filter(name__in=group_names).count():
         return True
     return False
-
-
-def get_users_by_permission(permission_name, include_superusers=False):
-    appname, codename = permission_name.split('.')
-
-    query = Q(user_permissions__codename=codename, user_permissions__content_type__app_label=appname)
-    query |= Q(groups__permissions__codename=codename, groups__permissions__content_type__app_label=appname)
-    if include_superusers:
-        query |= Q(is_superuser=True)
-
-    return get_user_model().objects.filter(query).distinct()