diff -r 5ff1fc726848 -r c6bca38c1cbf parts/django/tests/modeltests/m2m_intermediary/models.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/parts/django/tests/modeltests/m2m_intermediary/models.py	Sat Jan 08 11:20:57 2011 +0530
@@ -0,0 +1,36 @@
+"""
+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`` objects, 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(max_length=30)
+    last_name = models.CharField(max_length=30)
+
+    def __unicode__(self):
+        return u"%s %s" % (self.first_name, self.last_name)
+
+class Article(models.Model):
+    headline = models.CharField(max_length=100)
+    pub_date = models.DateField()
+
+    def __unicode__(self):
+        return self.headline
+
+class Writer(models.Model):
+    reporter = models.ForeignKey(Reporter)
+    article = models.ForeignKey(Article)
+    position = models.CharField(max_length=100)
+
+    def __unicode__(self):
+        return u'%s (%s)' % (self.reporter, self.position)
+