--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/thirdparty/google_appengine/lib/django/tests/modeltests/m2o_recursive/models.py	Tue Aug 26 21:49:54 2008 +0000
@@ -0,0 +1,40 @@
+"""
+11. Relating an object to itself, many-to-one
+
+To define a many-to-one relationship between a model and itself, use
+``ForeignKey('self')``.
+
+In this example, a ``Category`` is related to itself. That is, each
+``Category`` has a parent ``Category``.
+
+Set ``related_name`` to designate what the reverse relationship is called.
+"""
+
+from django.db import models
+
+class Category(models.Model):
+    name = models.CharField(maxlength=20)
+    parent = models.ForeignKey('self', null=True, related_name='child_set')
+
+    def __str__(self):
+        return self.name
+
+__test__ = {'API_TESTS':"""
+# Create a few Category objects.
+>>> r = Category(id=None, name='Root category', parent=None)
+>>> r.save()
+>>> c = Category(id=None, name='Child category', parent=r)
+>>> c.save()
+
+>>> r.child_set.all()
+[<Category: Child category>]
+>>> r.child_set.get(name__startswith='Child')
+<Category: Child category>
+>>> print r.parent
+None
+
+>>> c.child_set.all()
+[]
+>>> c.parent
+<Category: Root category>
+"""}