1 files changed, 18 insertions, 0 deletions
diff --git a/tests/serializers/models/natural.py b/tests/serializers/models/natural.py
index b50956692e..cd24b67f0a 100644
--- a/tests/serializers/models/natural.py
+++ b/tests/serializers/models/natural.py
@@ -19,3 +19,21 @@ class NaturalKeyAnchor(models.Model):
 
 class FKDataNaturalKey(models.Model):
     data = models.ForeignKey(NaturalKeyAnchor, models.SET_NULL, null=True)
+
+
+class NaturalKeyThing(models.Model):
+    key = models.CharField(max_length=100)
+    other_thing = models.ForeignKey('NaturalKeyThing', on_delete=models.CASCADE, null=True)
+    other_things = models.ManyToManyField('NaturalKeyThing', related_name='thing_m2m_set')
+
+    class Manager(models.Manager):
+        def get_by_natural_key(self, key):
+            return self.get(key=key)
+
+    objects = Manager()
+
+    def natural_key(self):
+        return (self.key,)
+
+    def __str__(self):
+        return self.key