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utils/ensureGeoData.js

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+const fs = require('fs')
+const path = require('path')
+const { CountryModel, ProvinceModel, CityModel } = require('../models/StateCity')
+
+/**
+ * Single source of truth for keeping the Country/Province/City reference
+ * collections in sync with data/geo/{countries,provinces,cities}.json.
+ * Runs automatically on every backend boot (see boot/mongo.js) — no manual
+ * script to remember to re-run when the JSON files change. Cheap no-op when
+ * already in sync (only a countDocuments() + JSON parse), unless force=true.
+ */
+async function ensureGeoData(force = false) {
+  const dataDir = path.join(__dirname, '../data/geo')
+  const countries = JSON.parse(fs.readFileSync(path.join(dataDir, 'countries.json'), 'utf8'))
+  const provinces = JSON.parse(fs.readFileSync(path.join(dataDir, 'provinces.json'), 'utf8'))
+  const cities = JSON.parse(fs.readFileSync(path.join(dataDir, 'cities.json'), 'utf8'))
+
+  const provincesWithFaCount = provinces.filter((p) => p.name_fa).length
+
+  const [countryCount, provinceCount, cityCount, provinceFaCount] = await Promise.all([
+    CountryModel.countDocuments(),
+    ProvinceModel.countDocuments(),
+    CityModel.countDocuments(),
+    ProvinceModel.countDocuments({ name_fa: { $exists: true, $ne: null } })
+  ])
+  const inSync =
+    countryCount === countries.length &&
+    provinceCount === provinces.length &&
+    cityCount === cities.length &&
+    provinceFaCount === provincesWithFaCount
+  if (!force && inSync) return
+
+  console.log(`[boot] Geo reference data out of sync (countries: ${countryCount}/${countries.length}, provinces: ${provinceCount}/${provinces.length}, cities: ${cityCount}/${cities.length}) — reseeding...`)
+
+  await CountryModel.deleteMany({})
+  await ProvinceModel.deleteMany({})
+  await CityModel.deleteMany({})
+
+  await CountryModel.insertMany(countries)
+  await ProvinceModel.insertMany(
+    provinces.map((p) => ({ id: p.id, name: p.name, name_fa: p.name_fa, slug: p.slug, country_id: p.country_id }))
+  )
+  await CityModel.insertMany(
+    cities.map((c) => ({
+      id: c.id,
+      name: c.name,
+      name_fa: c.name_fa,
+      slug: c.slug,
+      province_id: c.province_id,
+      country_id: c.country_id
+    }))
+  )
+
+  console.log(`[boot] Geo reference data reseeded: ${countries.length} countries, ${provinces.length} provinces, ${cities.length} cities.`)
+}
+
+module.exports = { ensureGeoData }