Null Reference when submitting Umbraco Forms to custom data source - umbraco

Question

I'm trying to make Umbraco Forms (Umbraco v7.5.3) save to my own data source.
I followed this guide: http://www.nibble.be/?p=84
And it appears to work-ish. I can connect and generate a form based on the table. Which is nice.
My setup
I add a new forms data source with the connection string:
Provider=SQLNCLI11;Server=(localdb)\MSSQLLocalDB;Database=test;Integrated Security=SSPI;
My table looks like this:
The Id (PK) property is configured as Identity
I choose some fields I want to use in the form:
I choose which data types it should use:
I'm a bit puzzled why the Id field is there. I didn't select it, and the guide I followed didn't have this field either :/?
It generates this form for me:
Error
But when I try to submit form data I get the following error. Which isn't nice.
Server Error in '/' Application.
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of
the current web request. Please review the stack trace for more
information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not
set to an instance of an object.
Source Error:
An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of
the exception can be identified using the exception stack trace below.
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an
object.]
Umbraco.Forms.Core.Providers.DatasourceTypes.MsSql.InsertRecord(Record
record) +1750
Umbraco.Forms.Web.Services.RecordService.storeRecord(Record record,
Form form) +1574
Umbraco.Forms.Web.Services.RecordService.Approve(Record record, Form
form) +343 Umbraco.Forms.Web.Services.RecordService.Submit(Record
record, Form form) +565
Umbraco.Forms.Web.Controllers.UmbracoFormsController.SubmitForm(Form
form, FormViewModel model, Dictionary2 state, ControllerContext
context) +2245
Umbraco.Forms.Web.Controllers.UmbracoFormsController.GoForward(Form
form, FormViewModel model, Dictionary2 state) +205
Umbraco.Forms.Web.Controllers.UmbracoFormsController.HandleForm(FormViewModel
model, Boolean captchaIsValid) +785 lambda_method(Closure ,
ControllerBase , Object[] ) +143
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase
controller, Object[] parameters) +14
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext
controllerContext, IDictionary2 parameters) +157
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext
controllerContext, ActionDescriptor actionDescriptor, IDictionary2
parameters) +27
System.Web.Mvc.Async.AsyncControllerActionInvoker.b__39(IAsyncResult
asyncResult, ActionInvocation innerInvokeState) +22
System.Web.Mvc.Async.WrappedAsyncResult2.CallEndDelegate(IAsyncResult
asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult
asyncResult) +32
System.Web.Mvc.Async.AsyncInvocationWithFilters.b__3d()
+50 System.Web.Mvc.Async.<>c__DisplayClass46.b__3f()
+225 System.Web.Mvc.Async.<>c__DisplayClass46.b__3f()
+225 System.Web.Mvc.Async.<>c__DisplayClass46.b__3f()
+225 System.Web.Mvc.Async.<>c__DisplayClass46.b__3f()
+225 System.Web.Mvc.Async.<>c__DisplayClass46.b__3f()
+225 System.Web.Mvc.Async.<>c__DisplayClass33.b__32(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResult1.CallEndDelegate(IAsyncResult
asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult
asyncResult) +34
System.Web.Mvc.Async.<>c__DisplayClass2b.b__1c()
+26 System.Web.Mvc.Async.<>c__DisplayClass21.b__1e(IAsyncResult
asyncResult) +100
System.Web.Mvc.Async.WrappedAsyncResult1.CallEndDelegate(IAsyncResult
asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult
asyncResult) +27
System.Web.Mvc.Controller.b__1d(IAsyncResult
asyncResult, ExecuteCoreState innerState) +13
System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult
asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +49
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +36
System.Web.Mvc.Controller.b__15(IAsyncResult
asyncResult, Controller controller) +12
System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult
asyncResult) +22
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +49
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +26
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult
asyncResult) +10
System.Web.Mvc.MvcHandler.b__5(IAsyncResult
asyncResult, ProcessRequestState innerState) +21
System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult
asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +49
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult)
+28 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult
result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+9765121 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
Questions
Why is the Id field added to my form when I didn't select it?
How is the form linked to my table? When I create a new form I cannot set a data source for it, and I cannot find any config on the generated form that points to my data source.
How are form fields linked to a table column? Is it via the "display name"?
Why do I get the above Null Reference when trying to submit my form?

Answer 1

I was able to solve the problem by upgrading the version of Umbraco Forms. I guess this was a known issue for Umbraco v7.4.3 and Umbraco Forms v4.3.2, which are the versions I was using.
See this issue report: http://issues.umbraco.org/issue/CON-1188