fix permanent notification callback

com/models.py

@@ -160,9 +160,12 @@ class News(models.Model):
         )
 
 
-def news_notification_callback(notif):
+def news_notification_callback(notif: Notification):
+    # the NewsDate linked to the News
+    # which creation triggered this callback may not exist yet,
+    # so it's important to filter by "not past date" rather than by "future date"
     count = News.objects.filter(
-        dates__start_date__gt=timezone.now(), is_published=False
+        ~Q(dates__start_date__gt=timezone.now()), is_published=False
     ).count()
     if count:
         notif.viewed = False

com/tests/test_notifications.py

@@ -0,0 +1,23 @@
+import pytest
+from django.conf import settings
+from model_bakery import baker
+
+from com.models import News
+from core.models import Group, Notification, User
+
+
+@pytest.mark.django_db
+def test_notification_created():
+    com_admin_group = Group.objects.get(pk=settings.SITH_GROUP_COM_ADMIN_ID)
+    com_admin_group.users.all().delete()
+    Notification.objects.all().delete()
+    com_admin = baker.make(User, groups=[com_admin_group])
+    for i in range(2):
+        # news notifications are permanent, so the notification created
+        # during the first iteration should be reused during the second one.
+        baker.make(News)
+        notifications = list(Notification.objects.all())
+        assert len(notifications) == 1
+        assert notifications[0].user == com_admin
+        assert notifications[0].type == "NEWS_MODERATION"
+        assert notifications[0].param == str(i + 1)

core/models.py

@@ -23,7 +23,6 @@
 #
 from __future__ import annotations
 
-import importlib
 import logging
 import os
 import string
@@ -51,6 +50,7 @@ from django.urls import reverse
 from django.utils import timezone
 from django.utils.functional import cached_property
 from django.utils.html import escape
+from django.utils.module_loading import import_string
 from django.utils.timezone import localdate, now
 from django.utils.translation import gettext_lazy as _
 from phonenumber_field.modelfields import PhoneNumberField
@@ -1452,22 +1452,24 @@ class Notification(models.Model):
         return self.get_type_display()
 
     def save(self, *args, **kwargs):
-        if not self.id and self.type in settings.SITH_PERMANENT_NOTIFICATIONS:
+        if self._state.adding and self.type in settings.SITH_PERMANENT_NOTIFICATIONS:
             old_notif = self.user.notifications.filter(type=self.type).last()
             if old_notif:
                 old_notif.callback()
                 old_notif.save()
                 return
+            # if this permanent notification is the first one,
+            # go into the callback nonetheless, because the logic
+            # to set Notification.param is here
+            # (please don't be mad at me, I'm not the one who cooked this spaghetti)
+            self.callback()
         super().save(*args, **kwargs)
 
     def callback(self):
-        # Get the callback defined in settings to update existing
+        func_name = settings.SITH_PERMANENT_NOTIFICATIONS.get(self.type)
-        # notifications
+        if not func_name:
-        mod_name, func_name = settings.SITH_PERMANENT_NOTIFICATIONS[self.type].rsplit(
+            return
-            ".", 1
+        import_string(func_name)(self)
-        )
-        mod = importlib.import_module(mod_name)
-        getattr(mod, func_name)(self)
 
 
 class Gift(models.Model):