chore: ruff fixes and formatting

mailadmin/models.py

@@ -8,31 +8,30 @@ class OrgUnit(models.Model):
 
     name = models.CharField(max_length=500)
     is_active = models.BooleanField(default=True)
-    admin_groups = models.ManyToManyField(Group, blank=True, related_name='admin_orgunits')
-    member_groups = models.ManyToManyField(Group, blank=True, related_name='member_orgunits')
+    admin_groups = models.ManyToManyField(Group, blank=True, related_name="admin_orgunits")
+    member_groups = models.ManyToManyField(Group, blank=True, related_name="member_orgunits")
     created = models.DateTimeField(auto_now_add=True)
     update = models.DateTimeField(auto_now=True)
     inside_id = models.IntegerField(null=True, blank=True)
 
     class Meta:
-        ordering = ['name']
+        ordering = ["name"]
 
 
 class PrefixQueryset(models.QuerySet):
-
     def as_regex(self):
-        prefixes = self.values_list('name', flat=True)
-        return '|'.join(['^{0}-|^{0}@'.format(p) for p in prefixes])
+        prefixes = self.values_list("name", flat=True)
+        return "|".join([f"^{p}-|^{p}@" for p in prefixes])
 
 
 class Prefix(models.Model):
     def __str__(self):
-        return self.name or ''
+        return self.name or ""
 
     name = models.CharField(max_length=500, blank=True, null=True)
-    orgunit = models.ForeignKey('mailadmin.OrgUnit', models.CASCADE, related_name='prefixes')
+    orgunit = models.ForeignKey("mailadmin.OrgUnit", models.CASCADE, related_name="prefixes")
 
     objects = PrefixQueryset.as_manager()
 
     class Meta:
-        verbose_name_plural = 'prefixes'
+        verbose_name_plural = "prefixes"