Question

I have a simple form which inserts a new Category with the given parentID (ServiceID).
and my parent child relationship is this;

Service > Category

my url for creating a Category based on the ServiceId is this
/Admin/Categories/Create/3 => “3 is the serviceID”

and my Action method is this

[AcceptVerbs(HttpVerbs.Post)]
        public ActionResult Create(int? id, Category category)
        {
            if (ModelState.IsValid)
            {
                try
                {
                    category.Service = dbService.GetAll().WithServiceId(id.Value).SingleOrDefault();
                    dbCategory.Add(category);
                    dbCategory.Save();
                    return RedirectToRoute("List_Categories", new { ServiceId = id.Value });
                }
                catch
                {
                    ModelState.AddRuleViolation(category.GetRuleViolations());
                }
            }
            return
                View ....

I am using LinqToSql for db actions. Anyway the strange part begins here.
When i save the data it inserts a data to Service table instead of insterting data just to Category Table and the data which is inserted to Category Table has the new inserted ServiceID.

Is it a problem with the ASP.NET MVC ModelBinder or am i doing a mistake that i dont see ?
I have used LinqToSql in several projects and have never had an issue like this

Answer 1

It could be an error in your LINQ To SQL set up. Is the service id an autogenerated field in the DB — is it marked as such in the LINQ to SQL classes? Does your service disconnect it from the data context, then not reattach it before submitting? If so, have you tried adding the category to the service and then saving the updated service?

  var service = ...
  service.Categories.Add(category);
  service.Save();