cforge-2.0.x-dev/modules/cforge_address/cforge_address.install

<?php

use Drupal\field\Entity\FieldConfig;
use Drupal\cforge_address\Entity\Neighbourhood;

function cforge_address_install() {
  $default_country = \Drupal::Config('system.date')
    ->get('country.default');
  FieldConfig::load('user.user.address')
    ->setSetting('available_countries', [$default_country])
    ->save();

  $hoods = \Drupal::database()->select('user__address', 'a')
    ->fields('a', ['address.dependent_locality'])
    ->groupBy('address.dependent_locality')
    ->execute()
    ->fetchCol();
  if (empty($hoods)) {
    // If no neighbourhoods are defined, create a default one.
    $hoods = ['Centre'];
  }
  // Remove duplicates and inconsistent casing, thanks to chatGPT!
  $hoods = array_unique(array_map('strtolower', $hoods));
  foreach ($hoods as $hood) {
    Neighbourhood::create(['label' => trim(ucfirst($hood))])->save();
  }
}