# -*- coding: utf-8 -*-

from odoo import fields, models, api, _
from datetime import datetime

class SaleOrder(models.Model):
    _inherit = "sale.order"

    @api.multi
    def write(self, vals):

        res = super(SaleOrder, self).write(vals)

        if self.partner_id:
            self.partner_id.last_order_changed = datetime.now()

        return res