def get_page(queryset, order_by, per_page, start=0):
if start < 0:
raise InvalidPage()
object_list = list(_slice_queryset(queryset, order_by, per_page, start))
if start and not object_list:
raise EmptyPage()
next_cursor = None
if len(object_list) > per_page:
next_slice_first_item = object_list.pop(-1)
attr_name = order_by.lstrip("-")
next_cursor = getattr(next_slice_first_item, attr_name)
return CursorPage(start, object_list, next_cursor)
def get_context(self, page, range_gap=5):
try:
page = int(page)
except (ValueError, TypeError) as exc:
raise InvalidPage(exc)
try:
paginator = self.page(page)
except EmptyPage:
return {
'EMPTY_PAGE': True,
}
if page > 5:
start = page-range_gap
else:
start = 1
if page < self.num_pages-range_gap:
end = page+range_gap+1
else:
end = self.num_pages+1
context = {
'page_range': list(range(start, end)),
'objects': paginator.object_list,
'num_pages': self.num_pages,
'page': page,
'has_pages': self.num_pages > 1,
'has_previous': paginator.has_previous(),
'has_next': paginator.has_next(),
'previous_page': paginator.previous_page_number() if paginator.has_previous() else None,
'next_page': paginator.next_page_number() if paginator.has_next() else None,
'is_first': page == 1,
'is_last': page == self.num_pages,
}
return context