Fixed #24078 -- Removed empty strings from GenericIPAddressField

django/db/models/fields/__init__.py

@@ -1910,7 +1910,7 @@ class IPAddressField(Field):
 
 
 class GenericIPAddressField(Field):
-    empty_strings_allowed = True
+    empty_strings_allowed = False
     description = _("IP address")
     default_error_messages = {}
 

docs/releases/1.8.txt

@@ -1009,6 +1009,11 @@ Miscellaneous
   different in some cases. There is no change to default values which are the
   result of a callable.
 
+* ``GenericIPAddressField.empty_strings_allowed`` is now ``False``. Database
+  backends that interpet empty strings as null (only Oracle among the backends
+  that Django includes) will no longer convert null values back to an empty
+  string. This is consistent with other backends.
+
 .. _deprecated-features-1.8:
 
 Features deprecated in 1.8

tests/model_fields/models.py

@@ -176,6 +176,10 @@ class VerboseNameField(models.Model):
     field22 = models.URLField("verbose field22")
 
 
+class GenericIPAddress(models.Model):
+    ip = models.GenericIPAddressField(null=True, protocol='ipv4')
+
+
 ###############################################################################
 # These models aren't used in any test, just here to ensure they validate
 # successfully.

tests/model_fields/tests.py

@@ -22,11 +22,11 @@ from django.utils import six
 from django.utils.functional import lazy
 
 from .models import (
-    Foo, Bar, Whiz, BigD, BigS, BigIntegerModel, Post, NullBooleanModel,
-    BooleanModel, PrimaryKeyCharModel, DataModel, Document, RenamedField,
-    DateTimeModel, VerboseNameField, FksToBooleans, FkToChar, FloatModel,
-    SmallIntegerModel, IntegerModel, PositiveSmallIntegerModel, PositiveIntegerModel,
-    WhizIter, WhizIterEmpty)
+    Bar, BigD, BigIntegerModel, BigS, BooleanModel, DataModel, DateTimeModel,
+    Document, FksToBooleans, FkToChar, FloatModel, Foo, GenericIPAddress,
+    IntegerModel, NullBooleanModel, PositiveIntegerModel, PositiveSmallIntegerModel,
+    Post, PrimaryKeyCharModel, RenamedField, SmallIntegerModel, VerboseNameField,
+    Whiz, WhizIter, WhizIterEmpty)
 
 
 class BasicFieldTests(test.TestCase):
@@ -688,6 +688,14 @@ class GenericIPAddressFieldTests(test.TestCase):
         form_field = model_field.formfield()
         self.assertRaises(ValidationError, form_field.clean, '127.0.0.1')
 
+    def test_null_value(self):
+        """
+        Null values should be resolved to None in Python (#24078).
+        """
+        GenericIPAddress.objects.create()
+        o = GenericIPAddress.objects.get()
+        self.assertIsNone(o.ip)
+
 
 class PromiseTest(test.TestCase):
     def test_AutoField(self):