--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/thirdparty/google_appengine/lib/django/tests/modeltests/m2m_intermediary/models.py	Tue Aug 26 21:49:54 2008 +0000
@@ -0,0 +1,68 @@
+"""
+9. Many-to-many relationships via an intermediary table
+
+For many-to-many relationships that need extra fields on the intermediary
+table, use an intermediary model.
+
+In this example, an ``Article`` can have multiple ``Reporter``s, and each
+``Article``-``Reporter`` combination (a ``Writer``) has a ``position`` field,
+which specifies the ``Reporter``'s position for the given article (e.g. "Staff
+writer").
+"""
+
+from django.db import models
+
+class Reporter(models.Model):
+    first_name = models.CharField(maxlength=30)
+    last_name = models.CharField(maxlength=30)
+
+    def __str__(self):
+        return "%s %s" % (self.first_name, self.last_name)
+
+class Article(models.Model):
+    headline = models.CharField(maxlength=100)
+    pub_date = models.DateField()
+
+    def __str__(self):
+        return self.headline
+
+class Writer(models.Model):
+    reporter = models.ForeignKey(Reporter)
+    article = models.ForeignKey(Article)
+    position = models.CharField(maxlength=100)
+
+    def __str__(self):
+        return '%s (%s)' % (self.reporter, self.position)
+
+__test__ = {'API_TESTS':"""
+# Create a few Reporters.
+>>> r1 = Reporter(first_name='John', last_name='Smith')
+>>> r1.save()
+>>> r2 = Reporter(first_name='Jane', last_name='Doe')
+>>> r2.save()
+
+# Create an Article.
+>>> from datetime import datetime
+>>> a = Article(headline='This is a test', pub_date=datetime(2005, 7, 27))
+>>> a.save()
+
+# Create a few Writers.
+>>> w1 = Writer(reporter=r1, article=a, position='Main writer')
+>>> w1.save()
+>>> w2 = Writer(reporter=r2, article=a, position='Contributor')
+>>> w2.save()
+
+# Play around with the API.
+>>> a.writer_set.select_related().order_by('-position')
+[<Writer: John Smith (Main writer)>, <Writer: Jane Doe (Contributor)>]
+>>> w1.reporter
+<Reporter: John Smith>
+>>> w2.reporter
+<Reporter: Jane Doe>
+>>> w1.article
+<Article: This is a test>
+>>> w2.article
+<Article: This is a test>
+>>> r1.writer_set.all()
+[<Writer: John Smith (Main writer)>]
+"""}