From c4b8c46345305ad975e12f6a9a086874e639575c Mon Sep 17 00:00:00 2001
From: Raphael Merx <raphael.merx@gmail.com>
Date: Tue, 7 Mar 2017 12:22:45 +0900
Subject: [PATCH] [1.10.x] Fixed #27905 -- Added
 RelatedFieldWidgetWrapper.value_omitted_from_data().

Backport of fd75c8f2b7070774f6e90f408cb5cddf65b8734e from master
---
 django/contrib/admin/widgets.py | 3 +++
 docs/releases/1.10.7.txt        | 3 ++-
 tests/admin_widgets/tests.py    | 9 +++++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/django/contrib/admin/widgets.py b/django/contrib/admin/widgets.py
index e3553de70a..c228a3c594 100644
--- a/django/contrib/admin/widgets.py
+++ b/django/contrib/admin/widgets.py
@@ -337,6 +337,9 @@ class RelatedFieldWidgetWrapper(forms.Widget):
     def value_from_datadict(self, data, files, name):
         return self.widget.value_from_datadict(data, files, name)
 
+    def value_omitted_from_data(self, data, files, name):
+        return self.widget.value_omitted_from_data(data, files, name)
+
     def id_for_label(self, id_):
         return self.widget.id_for_label(id_)
 
diff --git a/docs/releases/1.10.7.txt b/docs/releases/1.10.7.txt
index dd5cf35fba..de9a511f07 100644
--- a/docs/releases/1.10.7.txt
+++ b/docs/releases/1.10.7.txt
@@ -9,4 +9,5 @@ Django 1.10.7 fixes several bugs in 1.10.6.
 Bugfixes
 ========
 
-* ...
+* Made admin's ``RelatedFieldWidgetWrapper`` use the wrapped widget's
+  ``value_omitted_from_data()`` method (:ticket:`27905`).
diff --git a/tests/admin_widgets/tests.py b/tests/admin_widgets/tests.py
index 378a9290b7..308ec175d4 100644
--- a/tests/admin_widgets/tests.py
+++ b/tests/admin_widgets/tests.py
@@ -631,6 +631,15 @@ class RelatedFieldWidgetWrapperTests(SimpleTestCase):
         self.assertTrue(wrapper.can_change_related)
         self.assertFalse(wrapper.can_delete_related)
 
+    def test_widget_delegates_value_omitted_from_data(self):
+        class CustomWidget(forms.Select):
+            def value_omitted_from_data(self, data, files, name):
+                return False
+        rel = models.Album._meta.get_field('band').remote_field
+        widget = CustomWidget()
+        wrapper = widgets.RelatedFieldWidgetWrapper(widget, rel, widget_admin_site)
+        self.assertIs(wrapper.value_omitted_from_data({}, {}, 'band'), False)
+
 
 @override_settings(ROOT_URLCONF='admin_widgets.urls')
 class AdminWidgetSeleniumTestCase(AdminSeleniumTestCase):