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

# -*- coding: utf-8 -*-
# License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl.html).
from odoo import fields, models


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

    birthplace = fields.Char("Birth place")
    birthplace_country_id = fields.Many2one(
        comodel_name="res.country",
        string="Birth country",
    )