Fixed #12901. Exclude overridden form fields from model field validat…

…ion. Thanks, Honza Král.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12496 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/forms/models.py

@@ -276,10 +276,18 @@ def _get_validation_exclusions(self):
             # adding these values to the model after form validation.
             if field not in self.fields:
                 exclude.append(f.name)
+
+            # Don't perform model validation on fields that were defined
+            # manually on the form and excluded via the ModelForm's Meta
+            # class. See #12901.
+            elif self._meta.fields and field not in self._meta.fields:
+                exclude.append(f.name)
+
             # Exclude fields that failed form validation. There's no need for
             # the model fields to validate them as well.
             elif field in self._errors.keys():
                 exclude.append(f.name)
+
             # Exclude empty fields that are not required by the form. The
             # underlying model field may be required, so this keeps the model
             # field from raising that error.
@@ -719,16 +727,26 @@ def save_new(self, form, commit=True):
     def add_fields(self, form, index):
         super(BaseInlineFormSet, self).add_fields(form, index)
         if self._pk_field == self.fk:
-            form.fields[self._pk_field.name] = InlineForeignKeyField(self.instance, pk_field=True)
+            name = self._pk_field.name
+            kwargs = {'pk_field': True}
         else:
             # 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.
+            name = self.fk.name
             kwargs = {
-                'label': getattr(form.fields.get(self.fk.name), 'label', capfirst(self.fk.verbose_name))
+                'label': getattr(form.fields.get(name), 'label', capfirst(self.fk.verbose_name))
             }
             if self.fk.rel.field_name != self.fk.rel.to._meta.pk.name:
                 kwargs['to_field'] = self.fk.rel.field_name
-            form.fields[self.fk.name] = InlineForeignKeyField(self.instance, **kwargs)
+
+        form.fields[name] = InlineForeignKeyField(self.instance, **kwargs)
+
+        # Add the generated field to form._meta.fields if it's defined to make
+        # sure validation isn't skipped on that field.
+        if form._meta.fields:
+            if isinstance(form._meta.fields, tuple):
+                form._meta.fields = list(form._meta.fields)
+            form._meta.fields.append(self.fk.name)
 
     def get_unique_error_message(self, unique_check):
         unique_check = [field for field in unique_check if field != self.fk.name]

tests/modeltests/model_forms/tests.py

@@ -0,0 +1,21 @@
+from django.test import TestCase
+from django import forms
+from models import Category
+
+
+class IncompleteCategoryForm(forms.ModelForm):
+    """
+    A form that replaces the model's url field with a custom one. This should
+    prevent the model field's validation from being called.
+    """
+    url = forms.CharField(required=False)
+
+    class Meta:
+        fields = ('name', 'slug')
+        model = Category
+
+class ValidationTest(TestCase):
+    def test_validates_with_replaced_field(self):
+        form = IncompleteCategoryForm(data={'name': 'some name', 'slug': 'some-slug'})
+        assert form.is_valid()
+