Merged regressiontests and modeltests into the test root.

tests/custom_pk/models.py

@@ -0,0 +1,48 @@
+# -*- 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 __future__ import absolute_import, unicode_literals
+
+from django.db import models
+
+from .fields import MyAutoField
+from django.utils.encoding import python_2_unicode_compatible
+
+
+@python_2_unicode_compatible
+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 __str__(self):
+        return "%s %s" % (self.first_name, self.last_name)
+
+@python_2_unicode_compatible
+class Business(models.Model):
+    name = models.CharField(max_length=20, primary_key=True)
+    employees = models.ManyToManyField(Employee)
+    class Meta:
+        verbose_name_plural = 'businesses'
+
+    def __str__(self):
+        return self.name
+
+@python_2_unicode_compatible
+class Bar(models.Model):
+    id = MyAutoField(primary_key=True, db_index=True)
+
+    def __str__(self):
+        return repr(self.pk)
+
+
+class Foo(models.Model):
+    bar = models.ForeignKey(Bar)
+