+ @staticmethod
+ def _calc_total_pages(records_count, last, page, per_page):
+ records_nr = records_count
+ if (records_count > last) and (last > 0):
+ records_nr = last
+
+ total_pages, remainder = divmod(records_nr, per_page)
+ if remainder > 0:
+ total_pages += 1
+ if page > 1 and page > total_pages:
+ raises.BadRequest(
+ 'Request page > total_pages [{}]'.format(total_pages))
+ return total_pages, records_nr
+
+ @staticmethod
+ def _set_pipelines(pipelines, sort, return_nr, page, per_page):
+ if sort:
+ pipelines.append({'$sort': sort})
+
+ over = (page - 1) * per_page
+ left = return_nr - over
+ pipelines.append({'$skip': over})
+ pipelines.append({'$limit': per_page if per_page < left else left})
+
+ return pipelines
+