Fixed #7888 -- Handle model inheritance with model formsets correctly. Thanks bpeschier for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8528 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/modeltests/model_forms/models.py

@@ -13,6 +13,12 @@ import tempfile
 from django.db import models
 from django.core.files.storage import FileSystemStorage
 
+# Python 2.3 doesn't have sorted()
+try:
+    sorted
+except NameError:
+    from django.utils.itercompat import sorted
+
 temp_storage = FileSystemStorage(tempfile.gettempdir())
 
 ARTICLE_STATUS = (
@@ -60,6 +66,9 @@ class ImprovedArticle(models.Model):
 class ImprovedArticleWithParentLink(models.Model):
     article = models.OneToOneField(Article, parent_link=True)
 
+class BetterWriter(Writer):
+    pass
+
 class PhoneNumber(models.Model):
     phone = models.PhoneNumberField()
     description = models.CharField(max_length=20)
@@ -91,7 +100,7 @@ class ImageFile(models.Model):
 
 __test__ = {'API_TESTS': """
 >>> from django import forms
->>> from django.forms.models import ModelForm
+>>> from django.forms.models import ModelForm, model_to_dict
 >>> from django.core.files.uploadedfile import SimpleUploadedFile
 
 The bare bones, absolutely nothing custom, basic case.
@@ -793,6 +802,11 @@ ValidationError: [u'Select a valid choice. 4 is not one of the available choices
 >>> ImprovedArticleWithParentLinkForm.base_fields.keys()
 []
 
+>>> bw = BetterWriter(name=u'Joe Better')
+>>> bw.save()
+>>> sorted(model_to_dict(bw).keys())
+['id', 'name', 'writer_ptr_id']
+
 # PhoneNumberField ############################################################
 
 >>> class PhoneNumberForm(ModelForm):