Synchronise group to Django group on saving

aleksis/core/models.py

@@ -2,6 +2,7 @@ from datetime import date, datetime
 from typing import Optional, Iterable, Union, Sequence, List
 
 from django.contrib.auth import get_user_model
+from djang.contrib.auth.models import Group as DjangoGroup
 from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 from django.db import models
@@ -260,6 +261,18 @@ class Group(ExtensibleModel):
     def __str__(self) -> str:
         return "%s (%s)" % (self.name, self.short_name)
 
+    def save(self, *args, **kwargs):
+        super().save(*args, **kwargs)
+
+        # Synchronise group to Django group with same name
+        dj_group, _ = DjangoGroup.objects.get_or_create(name=self.name)
+        dj_group.users.set(
+            list(
+                self.members.values_list("user", flat=True).union(self.owners.values_list("user", flat=True))
+            )
+        )
+        dj_group.save()
+
 
 class Activity(ExtensibleModel):
     user = models.ForeignKey("Person", on_delete=models.CASCADE, related_name="activities")