Odoo: How to download a file immediately from wizard

odoo_download_file.py

# -*- coding: utf-8 -*-
from odoo import http
from odoo.http import request
from odoo.addons.web.controllers.main import serialize_exception,content_disposition
import base64


class Binary(http.Controller):

    @http.route('/web/binary/download_document', type='http', auth="public")
    @serialize_exception
    def download_document(self, model, id, filename=None, **kw):
        """ Download link for files stored as binary fields.
        :param str model: name of the model to fetch the binary from
        :param str field: binary field
        :param str id: id of the record from which to fetch the binary
        :param str filename: field holding the file's name, if any
        :returns: :class:`werkzeug.wrappers.Response`
        """
        record = request.env[model].browse(int(id))
        binary_file = record.binary_file_name # aqui colocas el nombre del campo binario que almacena tu archivo
        filecontent = base64.b64decode(binary_file or '')
        content_type, disposition_content = False, False

        if not filecontent:
            return request.not_found()
        else:
            if not filename:
                filename = '%s_%s' % (model.replace('.', '_'), id)
            content_type = ('Content-Type', 'application/octet-stream')
            disposition_content = ('Content-Disposition', content_disposition(filename))

        return request.make_response(filecontent, [content_type,
                                                   disposition_content])
      
# Este es la funcion que debes agregar a tu clase
@api.multi
def download(self):
    path = "/web/binary/download_document?"
    model = "nombre.de.tu.modelo"
    filename = "Nombre del archivo"

    self.print_report() # esta es la funcion que genera mi archivo y lo almacena en el campo binario
    url = path + "model={}&id={}&filename={}.xls".format(
        model, self.id, filename)

    return {
        'type' : 'ir.actions.act_url',
        'url': url,
        'target': 'self',
        'tag': 'reload',
    }
  
# Ojo, al descargar el archivo el wizard se queda frizado, si resuelves como recargarlo me dejas saber

hi, good code,
what is """def download(self):""" for?

i try to integrate in my portal class so , i expect that the return will popup a "save file as"?
is that correct?

many thanks , it works :)