Created
December 30, 2013 16:07
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A more powerful Django queryset paginator. Sets up common boilerplate for pagination, including page number validity checking. It also provides a range of "neighbor" page numbers and find what page a specific object is on. `object_list` can be a queryset or iterable of objects, (not just Django models). Setting `page_range` arg will adjust numbe…
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from django.core.paginator import Paginator, InvalidPage, EmptyPage | |
def paginate(request, object_list, limit=10, page_range=10, object_pk=None): | |
paginator = Paginator(object_list, limit) | |
page = None | |
if object_pk: | |
if hasattr(object_list, 'values_list') and callable( | |
object_list.values_list): | |
object_list = list(object_list.values_list('pk', flat=True)) | |
else: | |
try: | |
object_list = [o.pk for o in object_list] | |
except (AttributeError, TypeError): | |
# AttributeError if object_list has no count() method. | |
# TypeError if object_list.count() requires arguments | |
# (i.e. is of type list). | |
pass | |
try: | |
object_index = object_list.index(object_pk) | |
except ValueError: | |
pass | |
else: | |
page = int(ceil(float(object_index + 1) / limit)) | |
try: | |
page = page or int(request.GET.get('page', 1)) | |
except ValueError: | |
page = 1 | |
try: | |
page_query = paginator.page(page) | |
except (EmptyPage, InvalidPage): | |
page_query = paginator.page(paginator.num_pages) | |
if page_query.paginator.num_pages <= page_range: | |
range_start = 1 | |
range_end = page_query.paginator.num_pages + 1 | |
else: | |
range_start = page - int(page_range / 2) | |
if range_start < 1: | |
range_start = 1 | |
range_end = range_start + page_range | |
if range_end >= page_query.paginator.num_pages: | |
range_start = page_query.paginator.num_pages - page_range + 1 | |
range_end = page_query.paginator.num_pages + 1 | |
page_query.neighbor_range = range(range_start, range_end) | |
return page_query |
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