diff --git a/crud/tests/stub_app/models.py b/crud/tests/stub_app/models.py
index 5540eea7c..1aab8779c 100644
--- a/crud/tests/stub_app/models.py
+++ b/crud/tests/stub_app/models.py
@@ -21,3 +21,8 @@ class Country(models.Model):
 
     def __str__(self):
         return self.name
+
+
+class City(models.Model):
+    name = models.CharField(max_length=50)
+    country = models.ForeignKey(Country)