Blog w Django III - Kategorie

# -*- coding: utf-8 -*-
from django.db import models

class NewsCategories(models.Model):
	name = models.CharField(max_length=255, verbose_name='Nazwa Kategorii')
	slug = models.SlugField(max_length=255, unique=True, prepopulate_from=("name", ), verbose_name='Odnośnik')
	icon =  models.ImageField(upload_to='icons', verbose_name='Ikonka Kategorii')
	class Meta:
		verbose_name = "Kategoria"
		verbose_name_plural = "Kategorie"
	class Admin:
		list_display = ('name',)
	def __str__(self):
		return self.name

class News(models.Model):
	category = models.ManyToManyField(NewsCategories, verbose_name='Kategorie')
	title = models.CharField(max_length=255, verbose_name='Tytuł')
	slug = models.SlugField(max_length=255, unique=True, prepopulate_from=("title", ), verbose_name='Odnośnik')
	text = models.TextField(verbose_name='Treść')
	date = models.DateTimeField(blank=True, verbose_name='Data dodania')
	wykop = models.CharField(max_length=255, verbose_name='Wykop', blank=True)
	class Meta:
		verbose_name = "Wiadomość"
		verbose_name_plural = "Wiadomości"
	class Admin:
		list_display = ('title', 'date')
		list_filter = ['date']
		search_fields = ['title', 'text']
		date_hierarchy = 'date'
	def __str__(self):
		return self.title

class NewsComments(models.Model):
	news = models.ForeignKey(News)
	text = models.TextField(verbose_name='Treść')
	author = models.CharField(max_length=255, verbose_name='Autor', blank=True)
	class Meta:
		verbose_name = "Komentarze"
		verbose_name_plural = "Komentarze"
	class Admin:
		list_display = ('text', 'author')
	def __str__(self):
		return self.text

(r'^news/(?P<slug>[\w\-_]+)/$', 'news.views.show_news'),

def show_news(request, slug):
	news = News.objects.get(slug=slug)
	# tworzymy manipulator
	manipulator = NewsComments.AddManipulator()
	if request.POST:
		# formularz wysłany
		data = request.POST.copy()
		# dodajemy brakujące dane
		data['author'] = str(request.user)
		data['news'] = news.id
		errors = manipulator.get_validation_errors(data)
		# jeżeli nie ma błędów zapisz dane i odświerz stronę - przekieruj na ten sam url
		if not errors:
			new = manipulator.save(data)
			return HttpResponseRedirect('/news/'+ str(slug) +'/')
	else:
		# formularz nie wysłany
		errors = {}
		data = {}
	# formularz
	form = forms.FormWrapper(manipulator, data, errors)
	comments = NewsComments.objects.filter(news=news.id)
	return render_to_response('show.html', {'news':news, 'form':form, 'comments':comments})

<h3>{% for c in news.category.all %}
<a href="/news/cat/{{ c.slug }}/">{{ c }}</a> 
{% endfor %}</h3>

def by_category(request, slug):
	from django.views.generic.list_detail import object_list
	cat = NewsCategories.objects.get(slug=slug)
	news = cat.set.all().order_by('-id')
	return object_list(request, news, paginate_by = 5, allow_empty = True, template_name = 'category_list.html', extra_context={'cat': slug})

(r'^news/cat/(?P<slug>[\w\-_]+)/?$','news.views.by_category'),

{% extends "index.html" %}
{% block content %}
	{% if object_list %}
		{% for new in object_list %}
			<h3>{{ new.title }}</h3>
			<p>{{ new.text }}<br />{{ new.date|truncatewords:"1" }} | <b><a href="/news/{{ new.slug }}/">Komentarze</a></b>: {{ new.newscomments_set.count }} | <b>Kategorie</b>: {% for c in new.category.all %}<a href="/news/cat/{{ c.slug }}/">{{ c }}</a> {% endfor %}</p>
		{% endfor %}
		
		{% if has_previous %}
			<div style="text-align:center;"><a href="/news/cat/{{ cat }}/?page={{ previous }}"><b>Nowsze Wiadomości</b></a></div>
		{% endif %}
		{% if has_next %}
			<div style="text-align:center;"><a href="/news/cat/{{ cat }}/?page={{ next }}"><b>Starsze Wiadomości</b></a></div>
		{% endif %}
	{% else %}
		Brak wiadomości
	{% endif %}
{% endblock %}

from django.conf import settings
from blog.news.models import *

def blog(request):
	return {'categories': NewsCategories.objects.all()}

TEMPLATE_CONTEXT_PROCESSORS = ("django.core.context_processors.auth",
"django.core.context_processors.debug",
"django.core.context_processors.i18n",
"globals.blog",)

<h3>Kategorie</h3>
				<ul>
					{% for c in categories %}
					<li><img src="/site_media/{{ c.icon }}" alt="" /> <a href="/news/cat/{{ c.slug }}/">{{ c.name }}</a></li>
					{% endfor %}
				</ul>