[1.8.x] Fixed #25160 (again) -- Moved data loss check on reverse relations.

Moved data loss check when assigning to a reverse one-to-one relation on
an unsaved instance to Model.save(). This is exactly the same change as
e4b813c but for reverse relations.

Backport of c3904de from master

2 files changed, 7 insertions, 0 deletions

diff --git a/docs/releases/1.8.5.txt b/docs/releases/1.8.5.txt
index 5a19a50137..ce03577cde 100644
--- a/docs/releases/1.8.5.txt
+++ b/docs/releases/1.8.5.txt
@@ -39,3 +39,7 @@ Bugfixes
 
 * Fixed custom queryset chaining with ``values()`` and ``values_list()``
   (:ticket:`20625`).
+
+* Moved the :ref:`unsaved model instance assignment data loss check
+  <unsaved-model-instance-check-18>` on reverse relations to ``Model.save()``
+  (:ticket:`25160`).
diff --git a/docs/releases/1.8.txt b/docs/releases/1.8.txt
index 3200e81f46..ec35dbe7a2 100644
--- a/docs/releases/1.8.txt
+++ b/docs/releases/1.8.txt
@@ -701,6 +701,9 @@ Assigning unsaved objects to relations raises an error
         ...
         ValueError: save() prohibited to prevent data loss due to unsaved related object 'author'.
 
+    A similar check on assignment to reverse one-to-one relations was removed
+    in Django 1.8.5.
+
 Assigning unsaved objects to a :class:`~django.db.models.ForeignKey`,
 :class:`~django.contrib.contenttypes.fields.GenericForeignKey`, and
 :class:`~django.db.models.OneToOneField` now raises a :exc:`ValueError`.