It seems Odoo guys have yet once more changed methods and classes so, my v10 working examples are messed up in v11...

I need to run a report by code, get the result and save it to an attachment. All by code!

Does anyone know how to do this?

SOLUTION

 #run the report and get the pdf (use the reports xml_id and pass record ids into render)

data, data_format = self.env.ref('hr_timesheet.timesheet_report').render([1,2,3])

#save the attachment

att_id = self.env['ir.attachment'].create({

            'name': 'My name',

            'type': 'binary',

            'datas': base64.encodestring(data),

            'datas_fname': 'Myname.pdf',

            'res_model': 'account.invoice',

            'res_id': invoice.id,

            'mimetype': 'application/x-pdf'

            })