[1.6.x] Fixed #21566 -- Fixed AttributeError when using bulk_create with ForeignObject.

Backport of bbc73e6a12 from master.

tests/foreign_object/tests.py

@@ -4,7 +4,7 @@ from operator import attrgetter
 from .models import (
     Country, Person, Group, Membership, Friendship, Article,
     ArticleTranslation, ArticleTag, ArticleIdea, NewsArticle)
-from django.test import TestCase
+from django.test import TestCase, skipUnlessDBFeature
 from django.utils.translation import activate
 from django.core.exceptions import FieldError
 from django import forms
@@ -362,6 +362,13 @@ class MultiColumnFKTests(TestCase):
                     'active_translation')[0].active_translation.title,
                 "foo")
 
+    @skipUnlessDBFeature('has_bulk_insert')
+    def test_batch_create_foreign_object(self):
+        """ See: https://code.djangoproject.com/ticket/21566 """
+        objs = [Person(name="abcd_%s" % i, person_country=self.usa) for i in range(0, 5)]
+        Person.objects.bulk_create(objs, 10)
+
+
 class FormsTests(TestCase):
     # ForeignObjects should not have any form fields, currently the user needs
     # to manually deal with the foreignobject relation.