Mage2\Wishlist\Controllers\WishlistController::_getProductIdBySlug PHP Method

    private function _getProductIdBySlug($slug)
    {
        $slugAttribute = ProductAttribute::where('identifier', '=', 'slug')->get()->first();
        $productVarcharValue = ProductVarcharValue::where('product_attribute_id', '=', $slugAttribute->id)->where('value', '=', $slug)->where('website_id', '=', $this->websiteId)->get()->first();
        return $productVarcharValue->product_id;
    }