mirror of
https://github.com/django/django.git
synced 2024-11-30 23:20:50 +01:00
34 lines
789 B
Python
34 lines
789 B
Python
from django.db import models
|
|
|
|
|
|
class Entity(models.Model):
|
|
pass
|
|
|
|
|
|
class Country(Entity):
|
|
name = models.CharField(max_length=30)
|
|
|
|
|
|
class EUCountry(Country):
|
|
join_date = models.DateField()
|
|
|
|
|
|
class City(models.Model):
|
|
name = models.CharField(max_length=30)
|
|
country = models.ForeignKey(Country, models.CASCADE)
|
|
|
|
|
|
class EUCity(models.Model):
|
|
name = models.CharField(max_length=30)
|
|
country = models.ForeignKey(EUCountry, models.CASCADE)
|
|
|
|
|
|
class Person(models.Model):
|
|
name = models.CharField(max_length=30)
|
|
born = models.ForeignKey(City, models.CASCADE, related_name='+')
|
|
died = models.ForeignKey(City, models.CASCADE, related_name='+')
|
|
|
|
|
|
class PersonProfile(models.Model):
|
|
person = models.OneToOneField(Person, models.CASCADE, related_name='profile')
|