def get_pagination(item_list, request):
page_size, page = request.GET.get('page_size'), request.GET.get('page')
if page_size in ("10", "20", "40"):
page_size = int(page_size)
else:
page_size = 10
paginator = Paginator(item_list, page_size)
paginator.page_size = page_size
try:
item_list = paginator.page(page)
except PageNotAnInteger:
# If page is not an integer, deliver first page.
item_list = paginator.page(1)
except EmptyPage:
# If page is out of range (e.g. 9999), deliver last page of results.
if page > paginator.num_pages:
item_list = paginator.page(paginator.num_pages)
else:
item_list = paginator.page(1)
paginator.first_page = item_list.number - 2
paginator.last_page = item_list.number + 2
if paginator.first_page <= 0:
paginator.last_page += 1 - paginator.first_page
paginator.first_page = 1
if paginator.last_page > paginator.num_pages:
paginator.first_page = paginator.first_page + (paginator.num_pages - paginator.last_page) if paginator.first_page + (paginator.num_pages - paginator.last_page) > 0 else 1
paginator.last_page = paginator.num_pages
querydict = request.GET.copy()
if 'page' in querydict:
del querydict['page']
if 'page_size' in querydict:
del querydict['page_size']
pagination_link = "?".join((request.path, querydict.urlencode()))
pagination_link = ("%s&" if pagination_link[-1:] != "?" else "%s") % pagination_link
return item_list, paginator, pagination_link
