code: public function migrate(Request $req)
      {
          if (count($req->getArgs()) != 1) {
              echo 'Wrong arguments.' . PHP_EOL . 'Usage : db/migration/migrate mapping_name' . PHP_EOL;
          } else {
              $mappingName = $req->getArgs()[0];
              $mapping = Mapping::get($mappingName);
              $cl = '\\' . ltrim(rtrim($mapping['config']['provider'], '\\'), '\\') . '\\Migration::migrate';
              if (is_callable($cl) === false) {
                  throw new RuntimeException(
                      'Migration migrate method is not callable on configured provider!'
                  );
              }
              call_user_func($cl, $mapping);
              echo 'Migrate - Done' . PHP_EOL;
          }
      }
docs: Run migration code for a mapping.
  
  @param Request $req current CLI request