From ee86e590516250a7db7bf7c9a979ced4faf4edd7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Modzelewski?= <michal.modzelewski@gmail.com>
Date: Fri, 2 Jan 2015 02:47:49 +0100
Subject: [PATCH] Refs #2443 -- Allowed creation of objects with NULL
 DurationFields

---
 django/db/models/fields/__init__.py      | 2 ++
 tests/model_fields/models.py             | 4 ++++
 tests/model_fields/test_durationfield.py | 7 ++++++-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index e090dc625a5..5d34137bf2c 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -1651,6 +1651,8 @@ class DurationField(Field):
     def get_db_prep_value(self, value, connection, prepared=False):
         if connection.features.has_native_duration_field:
             return value
+        if value is None:
+            return None
         return value.total_seconds() * 1000000
 
     def get_db_converters(self, connection):
diff --git a/tests/model_fields/models.py b/tests/model_fields/models.py
index 376a59c4139..2c6b707b885 100644
--- a/tests/model_fields/models.py
+++ b/tests/model_fields/models.py
@@ -129,6 +129,10 @@ class DurationModel(models.Model):
     field = models.DurationField()
 
 
+class NullDurationModel(models.Model):
+    field = models.DurationField(null=True)
+
+
 class PrimaryKeyCharModel(models.Model):
     string = models.CharField(max_length=10, primary_key=True)
 
diff --git a/tests/model_fields/test_durationfield.py b/tests/model_fields/test_durationfield.py
index fc2c22af61d..0ef160104d9 100644
--- a/tests/model_fields/test_durationfield.py
+++ b/tests/model_fields/test_durationfield.py
@@ -5,7 +5,7 @@ from django.core import exceptions, serializers
 from django.db import models
 from django.test import TestCase
 
-from .models import DurationModel
+from .models import DurationModel, NullDurationModel
 
 
 class TestSaveLoad(TestCase):
@@ -16,6 +16,11 @@ class TestSaveLoad(TestCase):
         loaded = DurationModel.objects.get()
         self.assertEqual(loaded.field, duration)
 
+    def test_create_empty(self):
+        NullDurationModel.objects.create()
+        loaded = NullDurationModel.objects.get()
+        self.assertEqual(loaded.field, None)
+
 
 class TestQuerying(TestCase):