Fixed #12582. Model validation on ForeignKeys now respects limit_choices_to. Thanks, Honza Král.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12271 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/fields/related.py

@@ -770,11 +770,12 @@ class ForeignKey(RelatedField, Field):
         super(ForeignKey, self).validate(value, model_instance)
         if not value:
             return
-        try:
-            self.rel.to._default_manager.get(**{self.rel.field_name:value})
-        except self.rel.to.DoesNotExist, e:
-            raise exceptions.ValidationError(
-                    self.error_messages['invalid'] % {'model': self.rel.to._meta.verbose_name, 'pk': value})
+
+        qs = self.rel.to._default_manager.filter(**{self.rel.field_name:value})
+        qs = qs.complex_filter(self.rel.limit_choices_to)
+        if not qs.exists():
+            raise exceptions.ValidationError(self.error_messages['invalid'] % {
+                'model': self.rel.to._meta.verbose_name, 'pk': value})
 
     def get_attname(self):
         return '%s_id' % self.name

tests/modeltests/validation/models.py

@@ -12,7 +12,7 @@ class ModelToValidate(models.Model):
     name = models.CharField(max_length=100)
     created = models.DateTimeField(default=datetime.now)
     number = models.IntegerField()
-    parent = models.ForeignKey('self', blank=True, null=True)
+    parent = models.ForeignKey('self', blank=True, null=True, limit_choices_to={'number': 10})
     email = models.EmailField(blank=True)
     url = models.URLField(blank=True)
     f_with_custom_validator = models.IntegerField(blank=True, null=True, validators=[validate_answer_to_universe])

tests/modeltests/validation/tests.py

@@ -33,6 +33,13 @@ class BaseModelValidationTests(ValidationTestCase):
         mtv = ModelToValidate(number=10, name='Some Name', parent_id=parent.pk)
         self.assertEqual(None, mtv.full_clean())
 
+    def test_limitted_FK_raises_error(self):
+        # The limit_choices_to on the parent field says that a parent object's
+        # number attribute must be 10, so this should fail validation.
+        parent = ModelToValidate.objects.create(number=11, name='Other Name')
+        mtv = ModelToValidate(number=10, name='Some Name', parent_id=parent.pk)
+        self.assertFailsValidation(mtv.full_clean, ['parent'])
+
     def test_wrong_email_value_raises_error(self):
         mtv = ModelToValidate(number=10, name='Some Name', email='not-an-email')
         self.assertFailsValidation(mtv.full_clean, ['email'])