[Solved] Internal error 500

[dani]

** UPDATE **
I've cleared this issue by creating a POCO List instead of using the objects from the DB (with EF4)
Is this the only way to use Telerik's Grid with EF4 objects with reference ?)

I see the AJAX call to the controller, and the return has a list inside it.
yet I get 500 Internal error:
What can it be ?

here is the view and controller code:
ItemsInOrder is a EF4 entity that represet a table with compound key (orderID and ItemID)

UPDATE: this is the server response:

The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.

I've tried also:

[GridAction]
       public ActionResult SelectItemGridAjax(int OrderID)
       {
           return View(new GridModel(ordersRepository.GetOrderItemsTK(OrderID).ToList()));
       }

but it didn't help. this is what the repository sends back:
              var  result = (from p in context.ItemsInOrders.Include("Order").Where(i=>i.OrderID == OrderID) select p).ToList();


Help will be appreciated...


On this view

<%=
                Html.Telerik().Grid<ItemsInOrder>()
                    .Name("ItemsInOrderGrid")
                                    .DataKeys(dataKeys =>
                                    {
                                        dataKeys.Add(e => e.OrderID);
                                        dataKeys.Add(e => e.ItemID);
                                    })

                    .ToolBar(commands => commands.Insert())
                    .DataBinding(dataBinding =>
                        {
                        dataBinding.Ajax()    //Ajax binding

                .Select("SelectItemGridAjax", "Orders", new { OrderID = Model.myOrder.OrderID })
                .Insert("InsertItemGridAjax", "Orders", new { OrderID = Model.myOrder.OrderID })
                .Update("UpdateItemGridAjax", "Orders")
                .Delete("DeleteItemGridAjax", "Orders");
                        })
                    .Columns(c =>
                        {
                            c.Bound(o => o.ItemID);
                            c.Bound(o => o.OrderID).Column.Visible = false;
                            c.Bound(o => o.ItemDescription);
                            c.Bound(o => o.NumOfItems);
                            c.Bound(o => o.CostOfItem);
                            c.Bound(o => o.TotalCost);
                            c.Bound(o => o.SupplyDate);
                            c.Command(commands =>
                                {
                                    commands.Edit();
                                    commands.Delete();
                                }).Width(180).Title("?????");
                        })
            %>

I get

POST SelectItemGridAjax?OrderID=2 http://localhost:6105/Orders/SelectItemGridAjax?OrderID=2	500 Internal Server Error

with this controller - I can see the ajax call reaching the controller, and the return has a list with 2 items on it.

[GridAction]
  public ActionResult SelectItemGridAjax(int OrderID)
  {
      return View(new GridModel(ordersRepository.GetOrderItemsTK(OrderID)));
  }

it also happens on the rest of the functions... (Insert, delete, Update):

POST InsertItemGridAjax?OrderID=2

http://localhost:6105/Orders/InsertItemGridAjax?OrderID=2

500 Internal Server Error

[AcceptVerbs(HttpVerbs.Post)]
   [GridAction]
   public ActionResult InsertItemGridAjax(int OrderID)
   {
       //Create a new instance of the EditableCustomer class.
       ItemsInOrder newItem = ItemsInOrder.CreateItemsInOrder(OrderID, "");
       newItem.OrderID = OrderID;

       //Perform model binding (fill the customer properties and validate it).
       if (TryUpdateModel(newItem))
       {
           //The model is valid - insert the customer.
           bool res = ordersRepository.InsertItemToOrder(OrderID, newItem);
       }

       //Rebind the grid
       return View(new GridModel(ordersRepository.GetOrderItemsTK(OrderID)));
   }

[Corey Gaudin]

I am having the exact same issue with a normal EF4 Model Object and a CodeFirst Model Object. It simply does not work in Ajax request modes. Is there any plans to fix this going forward? Because creating a DTO Object for every Model that is already like I need it and have to maintain properties and values in 2 different places, not to mention Data Annotations would get old real quick.

Any time I get back any object that is an Data Entity Model Object from Entity Framework 4 through the Ajax request, it returns a 500 Internal Error. Please reply. Is this being looked at?

[Atanas Korchev]

Hi Corey,

 I am afraid we cannot do much to fix this as this is default behavior of the JavaScriptSerializer when it finds a circular object reference. You can check my blog post for further information as well as the grid troubleshooting help article.

Greetings,
Atanas Korchev
the Telerik team