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			22 lines
		
	
	
		
			567 B
		
	
	
	
		
			Python
		
	
	
	
	
	
			
		
		
	
	
			22 lines
		
	
	
		
			567 B
		
	
	
	
		
			Python
		
	
	
	
	
	
| from django.db import models
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| 
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| 
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| class Person(models.Model):
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|     first_name = models.CharField(max_length=20)
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|     last_name = models.CharField(max_length=20)
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|     friends = models.ManyToManyField("self")
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| 
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| 
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| # A set of models that use a non-abstract inherited 'through' model.
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| class ThroughBase(models.Model):
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|     person = models.ForeignKey(Person, models.CASCADE)
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|     b = models.ForeignKey("B", models.CASCADE)
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| 
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| 
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| class Through(ThroughBase):
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|     extra = models.CharField(max_length=20)
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| 
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| 
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| class B(models.Model):
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|     people = models.ManyToManyField(Person, through=Through)
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