[1.2.X] Fixed #14234 -- Re-validating a model instance added via ModelForm no longer throws spurious PK uniqueness errors. Thanks to David Reynolds and Jeremy Dunck.

Also moved Model._adding to Model._state.adding to reduce instance namespace footprint.

Backport of r14612.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14615 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/forms/models.py

@@ -5,28 +5,34 @@ import tempfile
 from django.db import models
 from django.core.files.storage import FileSystemStorage
 
+
 temp_storage_location = tempfile.mkdtemp()
 temp_storage = FileSystemStorage(location=temp_storage_location)
 
+
 class BoundaryModel(models.Model):
     positive_integer = models.PositiveIntegerField(null=True, blank=True)
 
+
 callable_default_value = 0
 def callable_default():
     global callable_default_value
     callable_default_value = callable_default_value + 1
     return callable_default_value
 
+
 class Defaults(models.Model):
     name = models.CharField(max_length=255, default='class default value')
     def_date = models.DateField(default = datetime.date(1980, 1, 1))
     value = models.IntegerField(default=42)
     callable_default = models.IntegerField(default=callable_default)
 
+
 class ChoiceModel(models.Model):
     """For ModelChoiceField and ModelMultipleChoiceField tests."""
     name = models.CharField(max_length=10)
 
+
 class ChoiceOptionModel(models.Model):
     """Destination for ChoiceFieldModel's ForeignKey.
     Can't reuse ChoiceModel because error_message tests require that it have no instances."""
@@ -38,6 +44,7 @@ class ChoiceOptionModel(models.Model):
     def __unicode__(self):
         return u'ChoiceOption %d' % self.pk
 
+
 class ChoiceFieldModel(models.Model):
     """Model with ForeignKey to another model, for testing ModelForm
     generation with ModelChoiceField."""
@@ -51,11 +58,17 @@ class ChoiceFieldModel(models.Model):
     multi_choice_int = models.ManyToManyField(ChoiceOptionModel, blank=False, related_name='multi_choice_int',
                                               default=lambda: [1])
 
+
 class FileModel(models.Model):
     file = models.FileField(storage=temp_storage, upload_to='tests')
 
+
 class Group(models.Model):
     name = models.CharField(max_length=10)
 
     def __unicode__(self):
         return u'%s' % self.name
+
+
+class Cheese(models.Model):
+   name = models.CharField(max_length=100)

tests/regressiontests/forms/tests/regressions.py

@@ -3,6 +3,9 @@ from unittest import TestCase
 from django.forms import *
 from django.utils.translation import ugettext_lazy, activate, deactivate
 
+from regressiontests.forms.models import Cheese
+
+
 class FormsRegressionsTestCase(TestCase):
     def test_class(self):
         # Tests to prevent against recurrences of earlier bugs.
@@ -120,3 +123,21 @@ class FormsRegressionsTestCase(TestCase):
 
         f = SomeForm({'field': ['<script>']})
         self.assertEqual(t.render(Context({'form': f})), u'<ul class="errorlist"><li>field<ul class="errorlist"><li>&quot;&lt;script&gt;&quot; is not a valid value for a primary key.</li></ul></li></ul>')
+
+    def test_regression_14234(self):
+        """
+        Re-cleaning an instance that was added via a ModelForm should not raise
+        a pk uniqueness error.
+
+        """
+        class CheeseForm(ModelForm):
+            class Meta:
+                model = Cheese
+
+        form = CheeseForm({
+            'name': 'Brie',
+        })
+        if form.is_valid():
+            obj = form.save()
+            obj.name = 'Camembert'
+            obj.full_clean()