object save needs to be atomic transaction so entire object is saved

src/c3nav/editor/wrappers.py

@@ -4,7 +4,7 @@ from collections import OrderedDict
 from functools import reduce, wraps
 from itertools import chain
 
-from django.db import models
+from django.db import models, transaction
 from django.db.models import Field, FieldDoesNotExist, Manager, ManyToManyRel, Prefetch, Q
 from django.utils.functional import cached_property
 
@@ -276,6 +276,7 @@ class ModelInstanceWrapper(BaseWrapper):
             author = self._author
         if self.pk is None:
             self._changeset.add_create(self, author=author)
+        with transaction.atomic():
             for field, initial_value in self._initial_values.items():
                 if field.many_to_one:
                     try: