How to access the key attributes of a model

This is mi code:

models.py:

@autoconnect

class Category(models.Model):

    name = models.CharField(max_length=100)

    slug = models.CharField(max_length=100, blank=True)

    description = models.CharField(max_length=200)

    creation_date = models.DateTimeField(auto_now_add=True)

    def __unicode__(self):

        return self.name

    def pre_save(self):

        """metodo de la clase Category para calcular el slug de una categoria"""

        self.slug = self.name.replace(" ", "_").lower()

        print(self.slug)

@autoconnect

class Post(models.Model):

    Status = ((1, "Publicado"), (2, "Borrador"), (3, "Eliminado"))

    status = models.IntegerField(choices=Status, default=2, blank=False)

    title = models.CharField(max_length=100, blank=False)

    slug = models.CharField(max_length=100, default=' ', blank=True)

    description = models.CharField(max_length=200, blank=False)

    content = models.TextField(default=" ", blank=False)

    category = models.ForeignKey(Category, default=1, blank=False)

    creation_date = models.DateTimeField(auto_now_add=True)

    image = models.ImageField(upload_to="photos", default='/image.jpg', blank=False)

    author = models.ForeignKey(User, default=1)

views.py:

def blog(request):

    posts = models.Post.objects.filter(status=1).order_by("-creation_date")

    print(posts)

    categories = models.Category.objects.order_by("name")

    context = {

        "posts":posts,

        "categories":categories

    }

    return render(request, "blog.html", context)

urls.py:

url(r'^blog/categorias/(?P<slug>\w+)/$', views.blog_category_posts, name='blog_category_posts'),

blog.html:

{% for post in posts %}

    <a href="{% url 'detail_post' slug=post.slug %}">{{ post.title }}</a>

    <p>{{ post.description }}</p>

    <p><a href="{% url 'blog_category_posts' slug=post.category.slug %}">{{ post.category.name }}</a></p>

    <p><a href="{% url 'blog_author_posts' username=post.author.username %}">{{ post.author.username }}</a></p>

    <p>{{ post.creation_date }}</p>

{% endfor %}

When I click on the link of the category in the blog.html, I want to be able to pass the attribute slug to url, but it does not work.

Please help

Thanks in advance. 

--
You received this message because you are subscribed to the Google Groups "Django users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscribe@googlegroups.com.
To post to this group, send email to django-users@googlegroups.com.
Visit this group at https://groups.google.com/group/django-users.
To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/dccfe67f-c6cc-4239-91ef-2c9a85b43099%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.