MODELS.PY

# -*- coding: utf-8 -*-

from django.db import models
from mptt.fields import TreeForeignKey
from mptt.models import MPTTModel

class CatalogFolder(MPTTModel):

    title = models.CharField(max_length=50, verbose_name=u'Название')
    parent = TreeForeignKey('self', blank=True, null=True, related_name='folder', verbose_name=u'Категория')
    display = models.BooleanField(verbose_name=u'Отображается на главной странице')

    def __unicode__(self):
        return self.title

    class Meta:
        verbose_name = u'Категория'
        verbose_name_plural = u'Категории'

    @models.permalink
    def get_absolute_url(self):
        return 'object-list', (), {'folder_id': self.id}

class CatalogItem(MPTTModel):

    title = models.CharField(max_length=50, verbose_name=u'Название')
    parent = TreeForeignKey(CatalogFolder, blank=True, null=True, related_name='item', verbose_name=u'Категория')
    short_description = models.TextField(blank=True, verbose_name=u'Краткое описание',
                                         help_text=u'Краткое описание наименования товара')
    description = models.TextField(blank=True, verbose_name=u'Описание', help_text=u'Описание наименования товара')

    def __unicode__(self):
        return self.title

    class Meta:
        verbose_name = u'Наименование'
        verbose_name_plural = u'Наименования'

    @models.permalink
    def get_absolute_url(self):
        return 'item-detail', (), {'pk': self.pk}

URLS.PY

# -*- coding: utf-8 -*-

from catalog.views import ObjectListView, ItemDetailView
from django.conf.urls.defaults import patterns, include, url

urlpatterns = patterns('',
    url(r'^$', ObjectListView.as_view(), name="object-list"),
    url(r'^(?P<folder_id>\d+)/$', ObjectListView.as_view(), name="object-list"),
    url(r'^(?P<pk>\d+)/$', ItemDetailView.as_view(), name="item-detail"),
)

VIEWS.PY


# -*- coding: utf-8 -*-

from django.shortcuts import get_object_or_404
from django.views.generic.detail import DetailView
from django.views.generic.list import ListView
from catalog.models import CatalogFolder, CatalogItem

class ObjectListView(ListView):

    context_object_name = "object_list"
    template_name = "catalog/object_list.html"

    def get_queryset(self):

        if 'folder_id' not in self.kwargs:
            folders = CatalogFolder.objects.filter(parent=None)
            if folders:
                return folders
            else:
                return CatalogItem.objects.filter(parent=None)
        else:
            self.parent = get_object_or_404(CatalogFolder, pk=self.kwargs['folder_id'])
            folders = CatalogFolder.objects.filter(parent=self.parent)
            if folders:
                return folders
            else:
                return CatalogItem.objects.filter(parent=self.parent)

    def get_context_data(self, **kwargs):
        context = super(ObjectListView, self).get_context_data(**kwargs)
        if 'folder_id' in self.kwargs:
            context['folder'] = get_object_or_404(CatalogFolder, pk=self.kwargs['folder_id'])
        return context

class ItemDetailView(DetailView):

    context_object_name = "item_detail"
    template_name = "catalog/item_detail.html"

    def get_queryset(self):
        return CatalogItem.objects.all()