odoo-contact-addons/l10n_fr_department_state/models/res_partner.py

# -*- coding: utf-8 -*-
import logging
from odoo import models, fields, api, tools

_logger = logging.getLogger(__name__)


class ResPartner(models.Model):
    _inherit = "res.partner"

    state_id = fields.Many2one(
        compute="_compute_country_depatemnt",
        store=True,
    )

    @api.depends("country_department_id")
    def _compute_country_depatemnt(self):
        for partner in self:
            dept = partner.country_department_id
            dept_stat = dept.state_id
            if dept and dept_stat and not partner.state_id:
                partner.state_id = dept_stat