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			50 lines
		
	
	
		
			846 B
		
	
	
	
		
			Python
		
	
	
	
	
	
			
		
		
	
	
			50 lines
		
	
	
		
			846 B
		
	
	
	
		
			Python
		
	
	
	
	
	
| from django.db import models
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| 
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| 
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| class Country(models.Model):
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|     name = models.CharField(max_length=255)
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|     iso_two_letter = models.CharField(max_length=2)
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| 
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| 
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| class ProxyCountry(Country):
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|     class Meta:
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|         proxy = True
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| 
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| 
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| class ProxyProxyCountry(ProxyCountry):
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|     class Meta:
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|         proxy = True
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| 
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| 
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| class ProxyMultiCountry(ProxyCountry):
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|     pass
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| 
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| 
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| class ProxyMultiProxyCountry(ProxyMultiCountry):
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|     class Meta:
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|         proxy = True
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| 
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| 
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| class Place(models.Model):
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|     name = models.CharField(max_length=100)
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| 
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|     class Meta:
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|         abstract = True
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| 
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| 
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| class Restaurant(Place):
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|     pass
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| 
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| 
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| class Pizzeria(Restaurant):
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|     pass
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| 
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| 
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| class State(models.Model):
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|     two_letter_code = models.CharField(max_length=2, primary_key=True)
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| 
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| 
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| class TwoFields(models.Model):
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|     f1 = models.IntegerField(unique=True)
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|     f2 = models.IntegerField(unique=True)
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