public function loadEnvironmentConfig($environment)
{
$file = $this->app->config()['paths']['config']->expand('environments', $environment . '.php');
if (!is_file($file)) {
throw new \InvalidArgumentException(sprintf("Configuration file for environment '%s' not found: %s", $environment, $file));
}
$configurer = (require $file);
$configurer($this->app->config());
if ($this->connectionManagerSetUp) {
PersistedModel::connectionManager()->setDefaultConnection($environment);
}
}