How do I make a field invisible by using attrs {invisible} on a computed many2many field in XML.

attachment_ids = fields.Many2many("ir.attachment", compute="_attachment_list")

@api.multi
    def _attachment_list(self):
        self.attachment_ids = self.env['ir.attachment'].search([('res_model','=','my.model'),('res_id','=',self.id)])

On my xml I have:

(button)

attrs="{'invisible': [('activity_vendor_id','=', False), ('attachment_ids', '=', False)]}"

I have tried [(6,False,[])] but return an error.