Hi,

country_id = self.partner_id.country_id.id

Hi, there,

if you want to get the country_id(defined in the res. country) from the sale. order.

you can try this(for example):

@api.model
def name_get(self):
    _logger.info('----entry sale.order name_get----')
    result = [] 
    for rec in self:
        if rec.origin:
            result.append((rec.id, "{}-{}".format(rec.origin, rec.name)))
        else:
            result.append((rec.id, "{}".format(rec.partner_id.country_id.name)))
    return result

the backend is the relationship among sale. order, res. partner,res.country. you can use the many2one field to retrieve the value that you want.

hope it is useful.