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			34 lines
		
	
	
		
			847 B
		
	
	
	
		
			Python
		
	
	
	
	
	
			
		
		
	
	
			34 lines
		
	
	
		
			847 B
		
	
	
	
		
			Python
		
	
	
	
	
	
| """
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| Regression tests for proper working of ForeignKey(null=True).
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| """
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| 
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| from django.db import models
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| 
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| class SystemDetails(models.Model):
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|     details = models.TextField()
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| 
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| class SystemInfo(models.Model):
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|     system_details = models.ForeignKey(SystemDetails)
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|     system_name = models.CharField(max_length=32)
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| 
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| class Forum(models.Model):
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|     system_info = models.ForeignKey(SystemInfo)
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|     forum_name = models.CharField(max_length=32)
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| 
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| class Post(models.Model):
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|     forum = models.ForeignKey(Forum, null=True)
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|     title = models.CharField(max_length=32)
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| 
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|     def __unicode__(self):
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|         return self.title
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| 
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| class Comment(models.Model):
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|     post = models.ForeignKey(Post, null=True)
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|     comment_text = models.CharField(max_length=250)
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| 
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|     class Meta:
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|         ordering = ('comment_text',)
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| 
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|     def __unicode__(self):
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|         return self.comment_text
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