def get_viewable_members_serializer(self, request):
        """Get a QuerySet of User objects of students in the activity. Needed for the
        EighthScheduledActivitySerializer.

        Returns: QuerySet

        """
        ids = []
        user = request.user
        for member in self.members.all():
            show = False
            if member.can_view_eighth:
                show = member.can_view_eighth

            if not show and user and user.is_eighth_admin:
                show = True
            if not show and user and user.is_teacher:
                show = True
            if not show and member == user:
                show = True

            if show:
                ids.append(member.id)

        return User.objects.filter(id__in=ids)
Get a QuerySet of User objects of students in the activity. Needed for the
        EighthScheduledActivitySerializer.

        Returns: QuerySet