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