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diff --git a/parts/django/tests/modeltests/custom_pk/models.py b/parts/django/tests/modeltests/custom_pk/models.py
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+++ b/parts/django/tests/modeltests/custom_pk/models.py
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+# -*- coding: utf-8 -*-
+"""
+14. Using a custom primary key
+
+By default, Django adds an ``"id"`` field to each model. But you can override
+this behavior by explicitly adding ``primary_key=True`` to a field.
+"""
+
+from django.conf import settings
+from django.db import models, transaction, IntegrityError, DEFAULT_DB_ALIAS
+
+from fields import MyAutoField
+
+class Employee(models.Model):
+    employee_code = models.IntegerField(primary_key=True, db_column = 'code')
+    first_name = models.CharField(max_length=20)
+    last_name = models.CharField(max_length=20)
+    class Meta:
+        ordering = ('last_name', 'first_name')
+
+    def __unicode__(self):
+        return u"%s %s" % (self.first_name, self.last_name)
+
+class Business(models.Model):
+    name = models.CharField(max_length=20, primary_key=True)
+    employees = models.ManyToManyField(Employee)
+    class Meta:
+        verbose_name_plural = 'businesses'
+
+    def __unicode__(self):
+        return self.name
+
+class Bar(models.Model):
+    id = MyAutoField(primary_key=True, db_index=True)
+
+    def __unicode__(self):
+        return repr(self.pk)
+
+
+class Foo(models.Model):
+    bar = models.ForeignKey(Bar)
+