def paginate(request, queryset, page_size, page_arg="p", allow_empty=True):
"""
Paginates a queryset based on the arguments passed in. Returns the
paginator instance and the object list for the current page. The paginator
instance will also have a "this_page" variable that corresponds to the
current page returned by the paginator.page() method.
"""
paginator = Paginator(
queryset, page_size, allow_empty_first_page=allow_empty)
page_num = request.GET.get(page_arg, 1)
try:
page_num = int(page_num)
except ValueError:
page_num = 1
try:
page = paginator.page(page_num)
except InvalidPage as e:
raise Http404('Invalid page (%s): %s' % (page_num, str(e)))
# Add our custom "this_page" and "page_arg" variables to this paginator.
paginator.this_page = page
paginator.page_arg = page_arg
# Add our custom "previous_url" and "next_url" variables to this
# paginator instance so that we don't need to build the URL in the
# template, which is honestly kind of ugly.
def build_page_url(num):
get_params = request.GET.copy()
get_params[page_arg] = num
return '%s?%s' % (request.path, get_params.urlencode())
paginator.previous_url = None
if page.has_previous():
paginator.previous_url = build_page_url(page.previous_page_number())
paginator.next_url = None
if page.has_next():
paginator.next_url = build_page_url(page.next_page_number())
return (paginator, page.object_list)
