# 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'), ]