Slicing pagination in ListView? - django

Question

I have successfully added pagination to a list_contacts view (obviously for a Contact model). And am now trying to setup the template context so that I can limit the pagination display to look like this :
< 1 ... 5 6 7 8 9 ... 42 >
I went from this answer and tried to use a "paginator" template tag, unsuccessfully. The main problem is that I'm using ListView instead of the old object_list, and these two don't set the context the same way.
Here's my view :
from django.views.generic import ListView
from app.models import Contact
list_contacts = ListView.as_view(
model=Contact,
http_method_names = ['get'],
template_name='contacts.html',
context_object_name='contacts',
paginate_by=6
)
And my template "contacts.html" :
<ul class="pagination">
{# Previous page link #}
{% if page_obj.has_previous %}
<li>
«
</li>
{% else %}
<li class="disabled">
«
</li>
{% endif %}
{# First page #}
{% if show_first %}
<li>
1
</li>
<li>...</li>
{% endif %}
{# List of pages (with current "active") #}
{% for page in page_numbers %}
{% ifequal page page_obj.number %}
<li class="active">
{{ page }}
</li>
{% else %}
<li>
{{ page }}
</li>
{% endifequal %}
{% endfor %}
{# Last page #}
{% if show_last %}
<li>...</li>
<li>{{ page_obj.pages }}</li>
{% endif %}
{# Next page link #}
{% if page_obj.has_next %}
<li>
»
</li>
{% else %}
<li class="disabled">
»
</li>
{% endif %}
</ul>
EDIT: here's my view code that ended up working
class ListContactsView(ListView):
model = Contact
http_method_names = ['get']
template_name = 'contacts.html'
context_object_name = 'contacts'
paginate_by = 6
def get_context_data(self, **kwargs):
_super = super(ListContactsView, self)
context = _super.get_context_data(**kwargs)
adjacent_pages = 2
page_number = context['page_obj'].number
num_pages = context['paginator'].num_pages
startPage = max(page_number - adjacent_pages, 1)
if startPage <= 3:
startPage = 1
endPage = page_number + adjacent_pages + 1
if endPage >= num_pages - 1:
endPage = num_pages + 1
page_numbers = [n for n in xrange(startPage, endPage) \
if n > 0 and n <= num_pages]
context.update({
'page_numbers': page_numbers,
'show_first': 1 not in page_numbers,
'show_last': num_pages not in page_numbers,
})
return context
list_contacts = ListContactsView.as_view()

Answer 1

There are different ways to achieve this (or even a combination of some):
Override or extend get_context_data by calling super
Write a templatetag
Write a template filter
Override or extend the PaginationMixin
An example of the first
class MyListView(ListView):
def get_context_data(self, **kwargs):
context = super(MyListView, self).get_context_data(**kwargs)
context['foo'] = 'bar'
return context