[1.0.X] Fixed #9863. A ForeignKey with editable=False to the parent in an inline no longer raises an exception. Thanks to keithb for the test case and Alex Gaynor for the patch. Backport of r10239 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10287 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/forms/models.py

@@ -519,7 +519,11 @@ class BaseInlineFormSet(BaseModelFormSet):
         if self._pk_field == self.fk:
             form.fields[self._pk_field.name] = InlineForeignKeyField(self.instance, pk_field=True)
         else:
-            form.fields[self.fk.name] = InlineForeignKeyField(self.instance, label=form.fields[self.fk.name].label)
+            # The foreign key field might not be on the form, so we poke at the
+            # Model field to get the label, since we need that for error messages.
+            form.fields[self.fk.name] = InlineForeignKeyField(self.instance,
+                label=getattr(form.fields.get(self.fk.name), 'label', capfirst(self.fk.verbose_name))
+            )
 
 def _get_foreign_key(parent_model, model, fk_name=None):
     """

tests/regressiontests/admin_views/models.py

@@ -177,6 +177,20 @@ class PersonaAdmin(admin.ModelAdmin):
         BarAccountAdmin
     )
 
+class Parent(models.Model):
+    name = models.CharField(max_length=128)
+
+class Child(models.Model):
+    parent = models.ForeignKey(Parent, editable=False)
+    name = models.CharField(max_length=30, blank=True)
+
+class ChildInline(admin.StackedInline):
+    model = Child
+
+class ParentAdmin(admin.ModelAdmin):
+    model = Parent
+    inlines = [ChildInline]
+
 admin.site.register(Article, ArticleAdmin)
 admin.site.register(CustomArticle, CustomArticleAdmin)
 admin.site.register(Section, inlines=[ArticleInline])
@@ -184,6 +198,7 @@ admin.site.register(ModelWithStringPrimaryKey)
 admin.site.register(Color)
 admin.site.register(Thing, ThingAdmin)
 admin.site.register(Persona, PersonaAdmin)
+admin.site.register(Parent, ParentAdmin)
 
 # We intentionally register Promo and ChapterXtra1 but not Chapter nor ChapterXtra2.
 # That way we cover all four cases:

tests/regressiontests/admin_views/tests.py

@@ -819,3 +819,20 @@ class AdminInheritedInlinesTest(TestCase):
         self.failUnlessEqual(FooAccount.objects.all()[0].username, "%s-1" % foo_user)
         self.failUnlessEqual(BarAccount.objects.all()[0].username, "%s-1" % bar_user)
         self.failUnlessEqual(Persona.objects.all()[0].accounts.count(), 2)
+
+class TestInlineNotEditable(TestCase):
+    fixtures = ['admin-views-users.xml']
+
+    def setUp(self):
+        result = self.client.login(username='super', password='secret')
+        self.failUnlessEqual(result, True)
+
+    def tearDown(self):
+        self.client.logout()
+
+    def test(self):
+        """
+        InlineModelAdmin broken?
+        """
+        response = self.client.get('/test_admin/admin/admin_views/parent/add/')
+        self.failUnlessEqual(response.status_code, 200)