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