Fix UnboundLocalError than could occur during ModelAdmin validation.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16262 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/validation.py

@@ -247,9 +247,9 @@ def validate_fields_spec(cls, model, opts, flds, label):
             try:
                 f = opts.get_field(field)
             except models.FieldDoesNotExist:
-                # If we can't find a field on the model that matches,
-                # it could be an extra field on the form.
-                pass
+                # If we can't find a field on the model that matches, it could be an
+                # extra field on the form; nothing to check so move on to the next field.
+                continue
             if isinstance(f, models.ManyToManyField) and not f.rel.through._meta.auto_created:
                 raise ImproperlyConfigured("'%s.%s' "
                     "can't include the ManyToManyField field '%s' because "

tests/regressiontests/admin_validation/tests.py

@@ -256,3 +256,19 @@ class ValidationTestCase(TestCase):
             fields = ['title', 'extra_data']
 
         validate(FieldsOnFormOnlyAdmin, Song)
+
+    def test_non_model_first_field(self):
+        """
+        Regression for ensuring ModelAdmin.field can handle first elem being a
+        non-model field (test fix for UnboundLocalError introduced with r16225).
+        """
+        class SongForm(forms.ModelForm):
+            extra_data = forms.CharField()
+            class Meta:
+                model = Song
+
+        class FieldsOnFormOnlyAdmin(admin.ModelAdmin):
+            form = SongForm
+            fields = ['extra_data', 'title']
+
+        validate(FieldsOnFormOnlyAdmin, Song)