How can I pass value to qweb and add to binary field. Everything is 
fine but I don't know how to add value to qweb. Here is my code.
def button_plan(self):
        super(MrpProduction, self).button_plan()
        for report in self.bom_id.multiple_report:
            report_name = "action_report_template"
            template = report
            pdf = self.env.ref('bks_mo.action_report_template')._render_qweb_pdf(self.ids)
            report.operation_id.worksheet_type = 'pdf'
            report.operation_id.worksheet = base64.b64encode(pdf[0])

How can I add template value to qweb.