public IActionResult Index()
        {
            var assetModels = _assets.GetAll();

            var listingResult = assetModels
                                .Select(result => new AssetIndexListingModel
            {
                Id               = result.Id,
                ImageUrl         = result.ImageUrl,
                AuthororDirector = _assets.getAuthororDirector(result.Id),
                DeweyCallNumber  = _assets.GetDeweyIndex(result.Id),
                Title            = result.Title,
                Type             = _assets.GetType(result.Id)
            });

            var model = new AssetIndexModel()
            {
                Assets = listingResult
            };

            return(View(model));
        }