class meta 3a unique together 3d 28 27category name 27 2c 29

1class Category(models.Model):
2    name = models.CharField(max_length=200)
3    slug = models.SlugField()
4    parent = models.ForeignKey('self',blank=True, null=True ,related_name='children')
5
6    class Meta:
7        #enforcing that there can not be two categories under a parent with same slug
8        
9        # __str__ method elaborated later in post.  use __unicode__ in place of
10        
11        # __str__ if you are using python 2
12
13        unique_together = ('slug', 'parent',)    
14        verbose_name_plural = "categories"     
15
16    def __str__(self):                           
17        full_path = [self.name]                  
18        k = self.parent
19        while k is not None:
20            full_path.append(k.name)
21            k = k.parent
22        return ' -> '.join(full_path[::-1])