Tagging with django-taggit

INSTALLED_APPS = (
    'product',
    'taggit',
)

from datetime import date
from django.db import models
from django.template.defaultfilters import slugify
from django.utils.encoding import python2unicode_compatible

from taggit.managers import TaggableManager

@python_2_unicode_compatible
class Product(models.Model):
    name = models.CharField(max_length=255)
    slug = models.SlugField(max_length=255, blank=True)
    sku = models.CharField(max_length=255, blank=True, null=True)
    description = models.TextField()
    price = models.DecimalField(decimal_places=2, max_digits=10)
    active = models.BooleanField(default=True)
    featured = models.BooleanField(default=False)
    weight = models.DecimalField(
        max_digits=8, decimal_places=2, null=True, blank=True)
    height = models.DecimalField(
        max_digits=8, decimal_places=2, null=True, blank=True)
    date_added = models.DateField(null=True, blank=True)

    tags = TaggableManager()

    def __str(self):
        return self.name

    def save(self, kwargs):
        if not self.pk:
            self.date_added = date.today()

        if self.name and not self.slug:
            self.slug = slugify(self.name)

        if not self.sku:
            self.sku = self.slug
        super(Product, self).save(kwargs)

from django.views.generic import DetailView, ListView

from taggit.models import Tag

from .models import Product


class TagMixin(object):
    def get_context_data(self, kwargs):
        context = super(TagMixin, self).get_context_data(kwargs)
        context['tags'] = Tag.objects.all()
        return context

class ProductDetail(DetailView):
    template_name = 'product/detail.html'
    context_object_name = 'product'
    model = Product


class ProductIndex(TagMixin, ListView):
    template_name = 'product/index.html'
    model = Product
    paginate_by = '10'
    queryset = Product.objects.all()
    context_object_name = 'products'

class TagIndexView(TagMixin, ListView):
    template_name = 'product/index.html'
    model = Product
    paginate_by = '10'
    context_object_name = 'products'

    def get_queryset(self):
        return Product.objects.filter(tags__slug=self.kwargs.get('slug'))

from django.conf.urls import *

from .views import ProductDetail, ProductIndex, TagIndexView

urlpatterns = patterns(
    '',
    url(r'^$', ProductIndex.as_view(), name='products'),
    url(r'^tag/(?P<slug>[-\w]+)/$', TagIndexView.as_view(), name='tagged'),
    url(
        r'^(?P<pk>\d+)-(?P<slug>[-\w]+)/$', ProductDetail.as_view(),
        name='product'),
)

{% extends 'base.html' %}

{% block content %}
<div class="row">
  <div class="col-sm-2">
     <div class="panel panel-default">
      <div class="panel-heading">
        Categories
      </div>
      <div class="panel-body">
        <ul>
          {% for tag in tags %}
            <li><a href="{% url 'tagged' tag.slug %}">{{ tag.name }}</a></li>
          {% empty %}
            <li>No Tags</li>
          {% endfor %}
        </ul>
      </div>
    </div>
  </div>
  <div class="col-sm-10">
    {% for product in products %}
      <div class="panel panel-default">
        <div class="panel-heading">
          {{ product.name }}
        </div>
        <div class="panel-body">
          {{ product.description }}
          <br />
          <div class="row">
            <div class="col-sm-2">
              ${{ product.price }}
            </div>
            <div class="col-sm-2">
              <button class="btn btn-default btn-sm">Add to Cart</button>
            </div>
          </div>
        </div>
      </div>
    {% empty %}
      There are no products, sorry.
    {% endfor %}
  </div>
</div>
{% endblock %}