# Copyright 2018 Aitor Bouzas # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). from odoo import fields, models class City(models.Model): _inherit = "res.city" zip_ids = fields.One2many("res.city.zip", "city_id", string="Zips in this city") _sql_constraints = [ ( "name_state_country_uniq", "UNIQUE(name, state_id, country_id)", "You already have a city with that name in the same state." "The city must have a unique name within " "it's state and it's country", ) ]