--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/thirdparty/google_appengine/lib/django/tests/modeltests/one_to_one/models.py	Tue Aug 26 21:49:54 2008 +0000
@@ -0,0 +1,168 @@
+"""
+10. One-to-one relationships
+
+To define a one-to-one relationship, use ``OneToOneField()``.
+
+In this example, a ``Place`` optionally can be a ``Restaurant``.
+"""
+
+from django.db import models
+
+class Place(models.Model):
+    name = models.CharField(maxlength=50)
+    address = models.CharField(maxlength=80)
+
+    def __str__(self):
+        return "%s the place" % self.name
+
+class Restaurant(models.Model):
+    place = models.OneToOneField(Place)
+    serves_hot_dogs = models.BooleanField()
+    serves_pizza = models.BooleanField()
+
+    def __str__(self):
+        return "%s the restaurant" % self.place.name
+
+class Waiter(models.Model):
+    restaurant = models.ForeignKey(Restaurant)
+    name = models.CharField(maxlength=50)
+
+    def __str__(self):
+        return "%s the waiter at %s" % (self.name, self.restaurant)
+
+class ManualPrimaryKey(models.Model):
+    primary_key = models.CharField(maxlength=10, primary_key=True)
+    name = models.CharField(maxlength = 50)
+
+class RelatedModel(models.Model):
+    link = models.OneToOneField(ManualPrimaryKey)
+    name = models.CharField(maxlength = 50)
+
+__test__ = {'API_TESTS':"""
+# Create a couple of Places.
+>>> p1 = Place(name='Demon Dogs', address='944 W. Fullerton')
+>>> p1.save()
+>>> p2 = Place(name='Ace Hardware', address='1013 N. Ashland')
+>>> p2.save()
+
+# Create a Restaurant. Pass the ID of the "parent" object as this object's ID.
+>>> r = Restaurant(place=p1, serves_hot_dogs=True, serves_pizza=False)
+>>> r.save()
+
+# A Restaurant can access its place.
+>>> r.place
+<Place: Demon Dogs the place>
+
+# A Place can access its restaurant, if available.
+>>> p1.restaurant
+<Restaurant: Demon Dogs the restaurant>
+
+# p2 doesn't have an associated restaurant.
+>>> p2.restaurant
+Traceback (most recent call last):
+    ...
+DoesNotExist: Restaurant matching query does not exist.
+
+# Set the place using assignment notation. Because place is the primary key on Restaurant,
+# the save will create a new restaurant
+>>> r.place = p2
+>>> r.save()
+>>> p2.restaurant
+<Restaurant: Ace Hardware the restaurant>
+>>> r.place
+<Place: Ace Hardware the place>
+
+# Set the place back again, using assignment in the reverse direction
+# Need to reget restaurant object first, because the reverse set
+# can't update the existing restaurant instance
+>>> p1.restaurant = r
+>>> r.save()
+>>> p1.restaurant
+<Restaurant: Demon Dogs the restaurant>
+
+>>> r = Restaurant.objects.get(pk=1)
+>>> r.place
+<Place: Demon Dogs the place>
+
+# Restaurant.objects.all() just returns the Restaurants, not the Places.
+# Note that there are two restaurants - Ace Hardware the Restaurant was created
+# in the call to r.place = p2. This means there are multiple restaurants referencing
+# a single place...
+>>> Restaurant.objects.all()
+[<Restaurant: Demon Dogs the restaurant>, <Restaurant: Ace Hardware the restaurant>]
+
+# Place.objects.all() returns all Places, regardless of whether they have
+# Restaurants.
+>>> Place.objects.order_by('name')
+[<Place: Ace Hardware the place>, <Place: Demon Dogs the place>]
+
+>>> Restaurant.objects.get(place__id__exact=1)
+<Restaurant: Demon Dogs the restaurant>
+>>> Restaurant.objects.get(pk=1)
+<Restaurant: Demon Dogs the restaurant>
+>>> Restaurant.objects.get(place__exact=1)
+<Restaurant: Demon Dogs the restaurant>
+>>> Restaurant.objects.get(place__exact=p1)
+<Restaurant: Demon Dogs the restaurant>
+>>> Restaurant.objects.get(place=1)
+<Restaurant: Demon Dogs the restaurant>
+>>> Restaurant.objects.get(place=p1)
+<Restaurant: Demon Dogs the restaurant>
+>>> Restaurant.objects.get(place__pk=1)
+<Restaurant: Demon Dogs the restaurant>
+>>> Restaurant.objects.get(place__name__startswith="Demon")
+<Restaurant: Demon Dogs the restaurant>
+
+>>> Place.objects.get(id__exact=1)
+<Place: Demon Dogs the place>
+>>> Place.objects.get(pk=1)
+<Place: Demon Dogs the place>
+>>> Place.objects.get(restaurant__place__exact=1)
+<Place: Demon Dogs the place>
+>>> Place.objects.get(restaurant__place__exact=p1)
+<Place: Demon Dogs the place>
+>>> Place.objects.get(restaurant__pk=1)
+<Place: Demon Dogs the place>
+>>> Place.objects.get(restaurant=1)
+<Place: Demon Dogs the place>
+>>> Place.objects.get(restaurant=r)
+<Place: Demon Dogs the place>
+>>> Place.objects.get(restaurant__exact=1)
+<Place: Demon Dogs the place>
+>>> Place.objects.get(restaurant__exact=r)
+<Place: Demon Dogs the place>
+
+# Add a Waiter to the Restaurant.
+>>> w = r.waiter_set.create(name='Joe')
+>>> w.save()
+>>> w
+<Waiter: Joe the waiter at Demon Dogs the restaurant>
+
+# Query the waiters
+>>> Waiter.objects.filter(restaurant__place__pk=1)
+[<Waiter: Joe the waiter at Demon Dogs the restaurant>]
+>>> Waiter.objects.filter(restaurant__place__exact=1)
+[<Waiter: Joe the waiter at Demon Dogs the restaurant>]
+>>> Waiter.objects.filter(restaurant__place__exact=p1)
+[<Waiter: Joe the waiter at Demon Dogs the restaurant>]
+>>> Waiter.objects.filter(restaurant__pk=1)
+[<Waiter: Joe the waiter at Demon Dogs the restaurant>]
+>>> Waiter.objects.filter(id__exact=1)
+[<Waiter: Joe the waiter at Demon Dogs the restaurant>]
+>>> Waiter.objects.filter(pk=1)
+[<Waiter: Joe the waiter at Demon Dogs the restaurant>]
+>>> Waiter.objects.filter(restaurant=1)
+[<Waiter: Joe the waiter at Demon Dogs the restaurant>]
+>>> Waiter.objects.filter(restaurant=r)
+[<Waiter: Joe the waiter at Demon Dogs the restaurant>]
+
+# Delete the restaurant; the waiter should also be removed
+>>> r = Restaurant.objects.get(pk=1)
+>>> r.delete()
+
+# One-to-one fields still work if you create your own primary key
+>>> o1 = ManualPrimaryKey(primary_key="abc123", name="primary")
+>>> o1.save()
+>>> o2 = RelatedModel(link=o1, name="secondary")
+>>> o2.save()
+"""}