#models.py

class Catalog(models.Model):
    catalog_name = models.CharField(max_length = 50, verbose_name="Имя каталога")
    catalog_slug = models.SlugField(max_length=50, verbose_name="Служебное поле")
    subcatalog = models.ManyToManyField(Subcatalog, null=True, verbose_name="Подкаталоги", blank=True)
    class Meta:
        verbose_name_plural = "Каталоги"
        verbose_name = "каталог"
    def __unicode__(self):
        return self.catalog_name
    def get_absolute_url(self):
        return "/catalog/"+self.slug

#vievs.py
@render_to('index.html')
def index(request):
    return {'catalogs': Catalog.objects.all(),
           'top': Product.objects.filter(in_top=True),
           'user':request.user,}

index.html
{% block left %}
<ul>
{% for i in catalogs %}
    <li><a href="{{i.catalog_name.get_absolute_url}}">{{i.catalog_name}}</a></li>
    {% ifequal i.catalog_name catalog_url %}
        <ul>
        {% for q in subcatalog_urls %}
            <li><a href="/catalog/{{i.catalog_name}}/{{q.subcatalog_name}}">{{q.subcatalog_name}}</a></li>
        {%endfor%}
        </ul>
        {% endifequal %}

{%endfor%}
</ul>
{% endblock %}