public void UpdateProductQuantity(List <ProductQuantityViewModel> productQuantityVm, int productId)
{
var productQuantities = Mapper.Map <List <ProductQuantityViewModel>, List <ProductQuantity> >(productQuantityVm);
// Remove quantities in Database that are removed on View
var productQuantitiesToDelete = _productQuantityRepository.FindAll(x => x.ProductId == productId && !productQuantities.Contains(x));
_productQuantityRepository.RemoveMultiple(productQuantitiesToDelete.ToList());
foreach (var quantityViewModel in productQuantities)
{
var quantityModel = _productQuantityRepository.FindById(quantityViewModel.Id);
quantityModel.Quantity = quantityViewModel.Quantity;
quantityModel.SizeId = quantityViewModel.SizeId;
quantityModel.ColorId = quantityViewModel.ColorId;
_productQuantityRepository.Update(quantityModel);
}
}