如何扩展BaseModel并使其返回关联数组中的数据？

class ExtendedModel extends BaseModel
{
    public function toArray()
    {
        $array = parent::toArray();

        // 获取关联数组中的数据
        $relations = $this->getRelations();
        foreach ($relations as $key => $value) {
            $array[$key] = $value->toArray();
        }

        return $array;
    }
}

$user = ExtendedModel::find(1);
$array = $user->toArray();