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diff --git a/parts/django/tests/modeltests/fixtures/models.py b/parts/django/tests/modeltests/fixtures/models.py
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+++ b/parts/django/tests/modeltests/fixtures/models.py
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+"""
+37. Fixtures.
+
+Fixtures are a way of loading data into the database in bulk. Fixure data
+can be stored in any serializable format (including JSON and XML). Fixtures
+are identified by name, and are stored in either a directory named 'fixtures'
+in the application directory, on in one of the directories named in the
+``FIXTURE_DIRS`` setting.
+"""
+
+from django.contrib.auth.models import Permission
+from django.contrib.contenttypes import generic
+from django.contrib.contenttypes.models import ContentType
+from django.db import models, DEFAULT_DB_ALIAS
+from django.conf import settings
+
+
+class Category(models.Model):
+    title = models.CharField(max_length=100)
+    description = models.TextField()
+
+    def __unicode__(self):
+        return self.title
+
+    class Meta:
+        ordering = ('title',)
+
+class Article(models.Model):
+    headline = models.CharField(max_length=100, default='Default headline')
+    pub_date = models.DateTimeField()
+
+    def __unicode__(self):
+        return self.headline
+
+    class Meta:
+        ordering = ('-pub_date', 'headline')
+
+class Blog(models.Model):
+    name = models.CharField(max_length=100)
+    featured = models.ForeignKey(Article, related_name='fixtures_featured_set')
+    articles = models.ManyToManyField(Article, blank=True,
+                                      related_name='fixtures_articles_set')
+
+    def __unicode__(self):
+        return self.name
+
+
+class Tag(models.Model):
+    name = models.CharField(max_length=100)
+    tagged_type = models.ForeignKey(ContentType, related_name="fixtures_tag_set")
+    tagged_id = models.PositiveIntegerField(default=0)
+    tagged = generic.GenericForeignKey(ct_field='tagged_type',
+                                       fk_field='tagged_id')
+
+    def __unicode__(self):
+        return '<%s: %s> tagged "%s"' % (self.tagged.__class__.__name__,
+                                         self.tagged, self.name)
+
+class PersonManager(models.Manager):
+    def get_by_natural_key(self, name):
+        return self.get(name=name)
+
+class Person(models.Model):
+    objects = PersonManager()
+    name = models.CharField(max_length=100)
+    def __unicode__(self):
+        return self.name
+
+    class Meta:
+        ordering = ('name',)
+
+    def natural_key(self):
+        return (self.name,)
+
+class Visa(models.Model):
+    person = models.ForeignKey(Person)
+    permissions = models.ManyToManyField(Permission, blank=True)
+
+    def __unicode__(self):
+        return '%s %s' % (self.person.name,
+                          ', '.join(p.name for p in self.permissions.all()))
+
+class Book(models.Model):
+    name = models.CharField(max_length=100)
+    authors = models.ManyToManyField(Person)
+
+    def __unicode__(self):
+        return '%s by %s' % (self.name,
+                          ' and '.join(a.name for a in self.authors.all()))
+
+    class Meta:
+        ordering = ('name',)