/**
* Add 'parent' and 'children' rels
*
* @param Config $config
*/
public static function initialize(Config $config)
{
$class = $config->getModelClass();
$config->addRel(new Rel\BelongsTo('parent', $config, $class::getRepo()))->addRel(new Rel\HasMany('children', $config, $class::getRepo(), ['foreignKey' => 'parentId']));
}