Delete fails with An object with a temporary EntityKey value cannot be attached to an object context

[Shawn]

I'm using Ajax binding, and my Destroy method looks like this:

[HttpPost]
public ActionResult AjaxDelete([DataSourceRequest]DataSourceRequest request, tbl_app_Customer customerToDelete) {
	if (customerToDelete != null) {
		db.tbl_app_Customer.Attach(customerToDelete);
                db.ObjectStateManager.ChangeObjectState(customerToDelete, EntityState.Deleted);
                db.SaveChanges();
        }
        return Json(ModelState.ToDataSourceResult());
}

However this code fails with the error:
An object with a temporary EntityKey value cannot be attached to an object context

Any idea why this is? What am I doing wrong?

[Shawn]

Please somebody from Telerik help

[Vitali]

Hey Shawn, I am was wondering how to configure my destroy action so that it accepts the model I want to destroy

[Mark]

Hello? Has anyone found a solution to this? How come the Kendo guys are ignoring this? have exactly the same problem and have been at it for days now, yet I am still stuck. I aso get the same error when I attempt t update.  Please someone who has experience with this, share your knowledge with us? Thank you!

[Victor]

I suppose you are using entity framwork? We are too, maybe I can help some... We always take the Id as the argument, not the full record. Then get the entity from the DB and then delete it (similair to updates). Since http is state-less I dont think you can assume that the the object in the db corresponds to the object the client sent. So, your code would be something like:

[HttpPost]

public ActionResult AjaxDelete([DataSourceRequest]DataSourceRequest request, Guid id) {

        //id could of course be an int or something else

        try {

            var customer = customerObjectSet.Single(c => c.Id == id);

            //or how you usually get your object from the db

            customerObjectSet.Delete(customer);

            db.SaveChanges();

            //Probably return success message or something

            return Json(ModelState.ToDataSourceResult());

        }

        catch {

            throw new SomethingTerribleWentWrongException();

            //Or whatever error handling

        }

}

/Victor