public async Task<IActionResult> AddAttributes(CreateProductAttributeQuery query)
        {
            var viewModel = await this.Mediator.Send(query);
            viewModel.ColorsSelectListViewModel = await this.Mediator.Send(new GetAllColorsSelectListQuery());
            viewModel.SizesSelectListViewModel = await this.Mediator
                .Send(new GetAllSizesSelectListQuery { MainCategoryId = viewModel.MainCategoryId });

            return this.View(viewModel);
        }