django class based views for all categories with all entires

问题

I have tried this for a couple of hours, and looked at alot of documentation, but I cant get it right. I dont think I'll see a solution to this anytime soon, so maybe someone could see what is wrong?

I want a view to show all my categories and all my connected entries to those categories.

I have tried to follow this example: django class-based-views topic

But I get this error: tuple index out of range

My model:

STATUS_CHOICES = (
    ('d', 'Draft'),
    ('p', 'Published'),
    ('w', 'Whitdrawn'),
)

class PublishedManager(models.Manager):
    use_for_related_fields = True
    def get_query_set(self):
        return super(PublishedManager, self).get_query_set().filter(status='p')

class Category(models.Model):
    name = models.CharField()
    slug = models.SlugField()
    status = models.CharField(max_length=1, default='d', choices=STATUS_CHOICES)
    published = PublishedManager()

class Entry(models.Model):
    name = models.CharField()
    slug = models.SlugField()
    category = models.ForeignKey(Category)
    status = models.CharField(max_length=1, default='d', choices=STATUS_CHOICES)
    published = PublishedManager()

My urls

#View for all categories and all connected entries
url(r'^blog/$', AllCategories.as_view()),
#View for one category - and all the connected entries
url(r'^blog/(?P<slug>[-\w]+)/$', CategoryList.as_view()),

My views

class AllCategories(ListView):
    context_object_name = "category_list"
    queryset = Category.published.all()

class CategoryList(ListView):

    template_name = 'blog/category_and_connected_entries.html'

    def get_queryset(self):
        self.category = get_object_or_404(Category, self=self.kwargs['slug'])
        return Entry.published.filter(category=self.category)

    def get_context_data(self, **kwargs):
        # Call the base implementation first to get a context
        context = super(CategoryList, self).get_context_data(**kwargs)
        # Add in the category
        context['category'] = self.category
        return context

Any help is much appreciated!

Edit:

Added my custom manager. I only have problems not showing unpublised entires in my template for listing all my categories and all their connected entires like:

Category 1
- Published entry 1
- Published entry 3
Category 2
- Published entry 7
- Published entry 9

I use this for loop getting the connected entires, but it also list the unpublised entires:

{% for entry in category.entry_set.all %}

回答1:

You can use _set.all, my code:

views.py
class Categories(models.Model):
    model = Category
    template_name = "#..."
    paginate_by = #...

template
Categories list:
{% for category in object_list %}
    Name: {{ category }}
    {% for entry in category.entry_set.all|slice:":2" %}
        {{ entry }}
    {% empty %}
       None
    {% endfor %}
{% endfor %}

回答2:

You get this mistake because the self.args which is a tuple of all the positional arguments is empty since you have not specified a group in your urls and you are trying to get the first element of an empty tuple(self.args[0])

Change your url to:
url(r'^blog/(\w+)/$', CategoryList.as_view()), in order to be able to capture the category using self.args[0]

Copying from the docs:

The key part to making this work is that when class-based views are called, various useful things are stored on self; as well as the request (self.request) this includes the positional (self.args) and name-based (self.kwargs) arguments captured according to the URLconf.

Apart from this i don't see any other mistake in your code.

回答3:

As per your comment if you just wanting to show all category with related entry then all you need to do is fetch all category with

def query_set(self):
    return Category.objects.all()

Then in your template just loop over the categories and nested loop for entries

{% for category in object_list %}
    <ul>
        <li>{{ category.name }}</li>
        {% for entry in category.entry_set.all %}
            <li>{{ entry }}</li>
        {% endfor %}
    </ul>
{% endfor %}

来源：https://stackoverflow.com/questions/12519678/django-class-based-views-for-all-categories-with-all-entires

标签

django

django-class-based-views