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from __future__ import unicode_literals
from django.contrib.auth.models import User
from django.db import models
from django.utils.encoding import python_2_unicode_compatible
# Forward declared intermediate model
@python_2_unicode_compatible
class Membership(models.Model):
person = models.ForeignKey('Person', models.CASCADE)
group = models.ForeignKey('Group', models.CASCADE)
price = models.IntegerField(default=100)
def __str__(self):
return "%s is a member of %s" % (self.person.name, self.group.name)
# using custom id column to test ticket #11107
@python_2_unicode_compatible
class UserMembership(models.Model):
id = models.AutoField(db_column='usermembership_id', primary_key=True)
user = models.ForeignKey(User, models.CASCADE)
group = models.ForeignKey('Group', models.CASCADE)
price = models.IntegerField(default=100)
def __str__(self):
return "%s is a user and member of %s" % (self.user.username, self.group.name)
@python_2_unicode_compatible
class Person(models.Model):
name = models.CharField(max_length=128)
def __str__(self):
return self.name
@python_2_unicode_compatible
class Group(models.Model):
name = models.CharField(max_length=128)
# Membership object defined as a class
members = models.ManyToManyField(Person, through=Membership)
user_members = models.ManyToManyField(User, through='UserMembership')
def __str__(self):
return self.name
# A set of models that use an non-abstract inherited model as the 'through' model.
class A(models.Model):
a_text = models.CharField(max_length=20)
class ThroughBase(models.Model):
a = models.ForeignKey(A, models.CASCADE)
b = models.ForeignKey('B', models.CASCADE)
class Through(ThroughBase):
extra = models.CharField(max_length=20)
class B(models.Model):
b_text = models.CharField(max_length=20)
a_list = models.ManyToManyField(A, through=Through)
# Using to_field on the through model
@python_2_unicode_compatible
class Car(models.Model):
make = models.CharField(max_length=20, unique=True, null=True)
drivers = models.ManyToManyField('Driver', through='CarDriver')
def __str__(self):
return "%s" % self.make
@python_2_unicode_compatible
class Driver(models.Model):
name = models.CharField(max_length=20, unique=True, null=True)
def __str__(self):
return "%s" % self.name
class Meta:
ordering = ('name',)
@python_2_unicode_compatible
class CarDriver(models.Model):
car = models.ForeignKey('Car', models.CASCADE, to_field='make')
driver = models.ForeignKey('Driver', models.CASCADE, to_field='name')
def __str__(self):
return "pk=%s car=%s driver=%s" % (str(self.pk), self.car, self.driver)
# Through models using multi-table inheritance
class Event(models.Model):
name = models.CharField(max_length=50, unique=True)
people = models.ManyToManyField('Person', through='IndividualCompetitor')
special_people = models.ManyToManyField(
'Person',
through='ProxiedIndividualCompetitor',
related_name='special_event_set',
)
teams = models.ManyToManyField('Group', through='CompetingTeam')
class Competitor(models.Model):
event = models.ForeignKey(Event, models.CASCADE)
class IndividualCompetitor(Competitor):
person = models.ForeignKey(Person, models.CASCADE)
class CompetingTeam(Competitor):
team = models.ForeignKey(Group, models.CASCADE)
class ProxiedIndividualCompetitor(IndividualCompetitor):
class Meta:
proxy = True
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