def get_project_ids(self):
        """
        Determines which projects the current user is allowed to visualize.
        Returns a list of project ids to be used in get_queryset() for
        filtering.
        """
        user = self.request.user
        projects = Project.objects.accessible_to(user).values('id')
        return [p['id'] for p in projects]
Determines which projects the current user is allowed to visualize.
        Returns a list of project ids to be used in get_queryset() for
        filtering.