cached_paginator.py

class CachedPaginator(Paginator):
	"""
	Paginator that does not count the rows in the table.
	"""
	@cached_property
	def count(self):
		"""Return the total number of objects, across all pages."""
		try:
			md5 = hashlib.md5(str(self.object_list.query).encode("utf-8")).hexdigest()
			cache_key = "admin_paginator:{0}".format(md5)
			counter = persistent_cache.get(cache_key) or None
			if counter is None:
				counter = self.object_list.count()
				persistent_cache.set(cache_key, counter, timeout=3600)

		except (AttributeError, TypeError):
			# AttributeError if object_list has no count() method.
			# TypeError if object_list.count() requires arguments
			# (i.e. is of type list).
			counter = len(self.object_list)

		return counter