partner-contact/partner_second_lastname/models/res_config_settings.py

# Copyright 2015 Antiun Ingenieria S.L. - Antonio Espinosa
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).

from odoo import models, api


class ResConfigSettings(models.TransientModel):
    _inherit = 'res.config.settings'

    def _partner_names_order_selection(self):
        options = super(
            ResConfigSettings, self)._partner_names_order_selection()
        new_labels = {
            'last_first': 'Lastname SecondLastname Firstname',
            'last_first_comma': 'Lastname SecondLastname, Firstname',
            'first_last': 'Firstname Lastname SecondLastname',
        }
        return [(k, new_labels[k]) if k in new_labels else (k, v)
                for k, v in options]

    @api.multi
    def _partners_for_recalculating(self):
        return self.env['res.partner'].search([
            ('is_company', '=', False),
            '|', '&', ('firstname', '!=', False), ('lastname', '!=', False),
            '|', '&', ('firstname', '!=', False), ('lastname2', '!=', False),
                 '&', ('lastname', '!=', False), ('lastname2', '!=', False),
        ])