jqgrid error Status: 'error'. Error code: 500 on add

Ok, I know there are already questions on here about this but none are giving me an answer.

I'm using jqgrid in MVC. In my View I have set up a jqgrid:

jQuery(document).ready(function () {
            var invoiceId = @Model.Invoice.InvoiceId;
            jQuery("#list").jqGrid({
            url: '/Invoice/InvoiceLineGridData/' + invoiceId,

....
            editurl: '/Invoice/SaveInvoiceLine/' +开发者_如何学编程 invoiceId,

...
        });

So my jqgrid is a list of invoiceLines that relate to an invoice. The edit works fine but when I try to do an add I get error Status: 'error'. Error code: 500.

The method it's calling on the controller is like:

public void SaveInvoiceLine(InvoiceLine invoiceLine, int id)
        {
            ...
        }

So what's causing the error on the add is it's trying to assign a null to id. I don't want to make the id nullable because it never will (should) be.

I've found the issue isn't with: var invoiceId = @Model.Invoice.InvoiceId;

as I for an experiment changed to editurl: '/Invoice/SaveInvoiceLine/2',

Even with this hardcoded on add I'm still getting the error with it coming through nullable.

Any suggestions on how to fix this?

This did it:

http://blog.palelocust.com/?p=52