/**
* Loads and returns an instance of the Forge for the specified
* database group, and loads the group if it hasn't been loaded yet.
*
* @param string|null $group
*/
public static function forge(string $group = null)
{
$config = new \Config\Database();
self::ensureFactory();
if (empty($group)) {
$group = ENVIRONMENT == 'testing' ? 'tests' : $config->defaultGroup;
}
if (!isset($config->{$group})) {
throw new \InvalidArgumentException($group . ' is not a valid database connection group.');
}
if (!isset(self::$instances[$group])) {
$db = self::connect($group);
} else {
$db = self::$instances[$group];
}
return self::$factory->loadForge($db);
}
