Use ContentTypeChoiceField for all ContentType fields

netbox/users/constants.py

@@ -0,0 +1,8 @@
+from django.db.models import Q
+
+
+OBJECTPERMISSION_OBJECT_TYPES = Q(
+    ~Q(app_label__in=['admin', 'auth', 'contenttypes', 'sessions', 'taggit', 'users']) |
+    Q(app_label='auth', model__in=['group', 'user']) |
+    Q(app_label='users', model__in=['objectpermission', 'token'])
+)