django/tests/test_utils/models.py

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from django.db import models
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class Car(models.Model):
name = models.CharField(max_length=100)
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class Person(models.Model):
name = models.CharField(max_length=100)
cars = models.ManyToManyField(Car, through='PossessedCar')
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class PossessedCar(models.Model):
car = models.ForeignKey(Car, models.CASCADE)
belongs_to = models.ForeignKey(Person, models.CASCADE)