/**
  * @param \Symfony\Component\Console\Input\InputInterface $input
  * @param \Symfony\Component\Console\Output\OutputInterface $output
  * @return void
  */
 protected function execute(InputInterface $input, OutputInterface $output)
 {
     $em = $this->getContainer()->get('doctrine')->getManager();
     foreach ($this->cities as $cityData) {
         $city = new City();
         $city->setName($cityData['name']);
         $city->setSlug($cityData['slug']);
         $city->setPostalCodes($cityData['postalCodes']);
         $city->setPopulation($cityData['population']);
         $city->setLongitude($cityData['longitude']);
         $city->setLatitude($cityData['latitude']);
         $em->persist($city);
         $em->flush();
     }
 }