public async Task <ActionResult> Create()
{
var p = new RelatedProductVM();
await PopulateSelectLists();
return(View(p));
}
public async Task CreateRelated(RelatedProductVM rp)
{
var fromProduct = await db.Products.SingleOrDefaultAsync(x => x.ProductId == rp.FromProductId);
var toProduct = await db.Products.SingleOrDefaultAsync(x => x.ProductId == rp.ToProductId);
if (fromProduct == null || toProduct == null)
{
throw new ArgumentException("Both products are required");
}
if (fromProduct.ProductId == toProduct.ProductId)
{
throw new ArgumentException("Cannot create a relationship between the same product");
}
fromProduct.RelatedToProducts.Add(toProduct);
await db.SaveChangesAsync();
}
public async Task <ActionResult> Create(RelatedProductVM p)
{
if (ModelState.IsValid)
{
try
{
await _ps.CreateRelated(p);
return(RedirectToAction("Index"));
}
catch (ArgumentException aex)
{
ModelState.AddModelError(string.Empty, aex.Message);
}
catch (Exception)
{
ModelState.AddModelError(string.Empty, "This relationship already exists");
}
}
await PopulateSelectLists();
return(View(p));
}