Paginator for infinite scroll on Django.

paginator.py

class Paginator(object):
    def __init__(self, object_list, per_page=10, latest_id=None, latest_id_field='id', order_by='desc'):
        assert type(latest_id_field) == str

        self.object_list = object_list
        self.per_page = per_page
        self.latest_id = latest_id
        self.latest_id_field = latest_id_field
        self.order_by = order_by

    def next(self):
        start_index = 0

        if self.latest_id:
            for obj in self.object_list:
                if self.order_by == 'desc' and getattr(obj, self.latest_id_field) < self.latest_id:
                    break
                elif self.order_by == 'asc' and getattr(obj, self.latest_id_field) > self.latest_id:
                    break
                start_index += 1
            else:
                return []

        return self.object_list[start_index:start_index+self.per_page]