static protected function createLog(
        Model $model,
        $action,
        Admin $admin = null,
        $changed = null)
    {
        return static::create([
            'model' => get_class($model),
            'key' => $model->getKey(),
            'action' => $action,
            'title' => static::getModelTitle($model),
            'changed' => $changed,
            'admin_id' => static::getAdminId($admin),
        ]);
    }