Python-сообщество

#model
class Categories(models.Model):
    parent = models.ForeignKey('self',to_field='name', default=None, blank=True, null = True)
    meta_title = models.TextField(max_length=200,blank=True, null=True)
    meta_description = models.TextField(max_length=255,blank=True, null=True)
    meta_keywords = models.TextField(max_length=255,blank=True, null=True)
    title = models.TextField(max_length=200,blank=True, null=True)
    url = models.TextField(max_length=200,blank=True, null=True)
    name = models.TextField(max_length=100,unique=True,blank=True, null=True)
    visible = models.IntegerField(default=1,null=True) 
    short = models.SmallIntegerField(blank=True, null=True)
    def parent_name(self):
        return self.parent.name
    parent_name.admin_order_field = 'parent__name'
    def __unicode__(self):
        return u'%s' % (self.name)
    def get_absolute_url(self):
        return "/category/%i/" % self.id
    def categories_menu(self):
        return Categories.objects.filter()

				{% for cat in categories.categories_menu %}
					{{cat.name}}
				{% endfor %}

from django import template
from test.models import Networks,Categories,Offers
register = template.Library()
def categories():
    categories = Categories.objects.all()
    return {'categories': categories}
register.inclusion_tag('test.html', takes_context=True)(categories)

{% load tagslib %}
				{% for cat in categories %}
					{{cat.name}}
				{% endfor %}