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diff --git a/tests/lookup/models.py b/tests/lookup/models.py
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+++ b/tests/lookup/models.py
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+"""
+7. The lookup API
+
+This demonstrates features of the database API.
+"""
+
+from __future__ import unicode_literals
+
+from django.db import models
+from django.utils import six
+from django.utils.encoding import python_2_unicode_compatible
+
+
+class Author(models.Model):
+    name = models.CharField(max_length=100)
+    class Meta:
+        ordering = ('name', )
+
+@python_2_unicode_compatible
+class Article(models.Model):
+    headline = models.CharField(max_length=100)
+    pub_date = models.DateTimeField()
+    author = models.ForeignKey(Author, blank=True, null=True)
+    class Meta:
+        ordering = ('-pub_date', 'headline')
+
+    def __str__(self):
+        return self.headline
+
+class Tag(models.Model):
+    articles = models.ManyToManyField(Article)
+    name = models.CharField(max_length=100)
+    class Meta:
+        ordering = ('name', )
+
+@python_2_unicode_compatible
+class Season(models.Model):
+    year = models.PositiveSmallIntegerField()
+    gt = models.IntegerField(null=True, blank=True)
+
+    def __str__(self):
+        return six.text_type(self.year)
+
+@python_2_unicode_compatible
+class Game(models.Model):
+    season = models.ForeignKey(Season, related_name='games')
+    home = models.CharField(max_length=100)
+    away = models.CharField(max_length=100)
+
+    def __str__(self):
+        return "%s at %s" % (self.away, self.home)
+
+@python_2_unicode_compatible
+class Player(models.Model):
+    name = models.CharField(max_length=100)
+    games = models.ManyToManyField(Game, related_name='players')
+
+    def __str__(self):
+        return self.name