mirror of
https://github.com/django/django.git
synced 2024-12-22 17:16:24 +00:00
121 lines
3.1 KiB
Python
121 lines
3.1 KiB
Python
"""
|
|
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, 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)
|
|
serves_cocktails = models.BooleanField(default=True)
|
|
|
|
def __str__(self):
|
|
return "%s the bar" % self.place.name
|
|
|
|
|
|
class UndergroundBar(models.Model):
|
|
place = models.OneToOneField(Place, null=True)
|
|
serves_cocktails = models.BooleanField(default=True)
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class Waiter(models.Model):
|
|
restaurant = models.ForeignKey(Restaurant)
|
|
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)
|
|
name = models.CharField(max_length=50)
|
|
|
|
|
|
@python_2_unicode_compatible
|
|
class MultiModel(models.Model):
|
|
link1 = models.OneToOneField(Place)
|
|
link2 = models.OneToOneField(ManualPrimaryKey)
|
|
name = models.CharField(max_length=50)
|
|
|
|
def __str__(self):
|
|
return "Multimodel %s" % self.name
|
|
|
|
|
|
class Target(models.Model):
|
|
pass
|
|
|
|
|
|
class Pointer(models.Model):
|
|
other = models.OneToOneField(Target, primary_key=True)
|
|
|
|
|
|
class Pointer2(models.Model):
|
|
other = models.OneToOneField(Target, related_name='second_pointer')
|
|
|
|
|
|
class HiddenPointer(models.Model):
|
|
target = models.OneToOneField(Target, 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)
|
|
objects = DirectorManager()
|