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"""
One-to-one relationships
To define a one-to-one relationship, use ``OneToOneField()``.
In this example, a ``Place`` optionally can be a ``Restaurant``.
"""
from __future__ import unicode_literals
from django.db import models
from django.utils.encoding import python_2_unicode_compatible
@python_2_unicode_compatible
class Place(models.Model):
name = models.CharField(max_length=50)
address = models.CharField(max_length=80)
def __str__(self):
return "%s the place" % self.name
@python_2_unicode_compatible
class Restaurant(models.Model):
place = models.OneToOneField(Place, models.CASCADE, primary_key=True)
serves_hot_dogs = models.BooleanField(default=False)
serves_pizza = models.BooleanField(default=False)
def __str__(self):
return "%s the restaurant" % self.place.name
@python_2_unicode_compatible
class Bar(models.Model):
place = models.OneToOneField(Place, models.CASCADE)
serves_cocktails = models.BooleanField(default=True)
def __str__(self):
return "%s the bar" % self.place.name
class UndergroundBar(models.Model):
place = models.OneToOneField(Place, models.SET_NULL, null=True)
serves_cocktails = models.BooleanField(default=True)
@python_2_unicode_compatible
class Waiter(models.Model):
restaurant = models.ForeignKey(Restaurant, models.CASCADE)
name = models.CharField(max_length=50)
def __str__(self):
return "%s the waiter at %s" % (self.name, self.restaurant)
@python_2_unicode_compatible
class Favorites(models.Model):
name = models.CharField(max_length=50)
restaurants = models.ManyToManyField(Restaurant)
def __str__(self):
return "Favorites for %s" % self.name
class ManualPrimaryKey(models.Model):
primary_key = models.CharField(max_length=10, primary_key=True)
name = models.CharField(max_length=50)
class RelatedModel(models.Model):
link = models.OneToOneField(ManualPrimaryKey, models.CASCADE)
name = models.CharField(max_length=50)
@python_2_unicode_compatible
class MultiModel(models.Model):
link1 = models.OneToOneField(Place, models.CASCADE)
link2 = models.OneToOneField(ManualPrimaryKey, models.CASCADE)
name = models.CharField(max_length=50)
def __str__(self):
return "Multimodel %s" % self.name
class Target(models.Model):
name = models.CharField(max_length=50)
class Pointer(models.Model):
other = models.OneToOneField(Target, models.CASCADE, primary_key=True)
class Pointer2(models.Model):
other = models.OneToOneField(Target, models.CASCADE, related_name='second_pointer')
class HiddenPointer(models.Model):
target = models.OneToOneField(Target, models.CASCADE, related_name='hidden+')
# Test related objects visibility.
class SchoolManager(models.Manager):
def get_queryset(self):
return super(SchoolManager, self).get_queryset().filter(is_public=True)
class School(models.Model):
is_public = models.BooleanField(default=False)
objects = SchoolManager()
class DirectorManager(models.Manager):
def get_queryset(self):
return super(DirectorManager, self).get_queryset().filter(is_temp=False)
class Director(models.Model):
is_temp = models.BooleanField(default=False)
school = models.OneToOneField(School, models.CASCADE)
objects = DirectorManager()
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