@classmethod
def add_param_filter(cls, qs, lookup_prefix='', **kwargs):
    """Add filters to queryset using table parameter fields.

        This is called for every simple parameter.

        Usage examples: :class:`DeploymentsByTicket
        <lino_xl.lib.deploy.desktop.DeploymentsByTicket>`, :mod:`lino_book.projects.min3.lib.contacts`.

        """
    return qs.filter(**kwargs)
