public function scopeExtrasWithValues($query, $model)
    {
        $modelSlug = $model ? getModelSlug($model) : false;
        return $query->with([
            'extras' => function($query) use($model,$modelSlug)
            {
                if ( ! $model ) return $query;

                return $query->with([
                    "{$modelSlug}s" => function($query) use($model,$modelSlug)
                    {
                        return $query->wherePivot("{$modelSlug}_id",$model->id);
                    }
                ]);
            }
        ]);
    }