from django.contrib.auth.models import User

from django.db import models

# Forward declared intermediate model

class Membership(models.Model):

    person = models.ForeignKey("Person", models.CASCADE)

    group = models.ForeignKey("Group", models.CASCADE)

    price = models.IntegerField(default=100)

# using custom id column to test ticket #11107

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)

class Person(models.Model):

    name = models.CharField(max_length=128)

    def __str__(self):

        return self.name

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

# Using to_field on the through model

class Car(models.Model):

    make = models.CharField(max_length=20, unique=True, null=True)

    drivers = models.ManyToManyField("Driver", through="CarDriver")

    def __str__(self):

        return str(self.make)

class Driver(models.Model):

    name = models.CharField(max_length=20, unique=True, null=True)

    class Meta:

        ordering = ("name",)

    def __str__(self):

        return str(self.name)

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