Strange error on delete

Hi,

we are observing a very strange error when we call DistributedUnitOfWork.Remove(Entity) over one of our entities.

This entity is called Path, and it´s related to another entity called MaterialData. A Path has a collection of MaterialData objects and for our WCF scenario we have the following properties:

• "Generate Back Reference Data Member Attribute" = false
• "Generate Collection Data Member Attribute" = false
• "Generate Back Reference Id Data Member Attribute" = true

When we Remove our path entity serveral things happen (not 100% is this exact order as everything happens nearly at the same time in different windows):

• In the Output window of VS we get one of our traces: Calling Delete(Entity)
• In the Output window of VS we get the following message: Step into: Stepping over non-user code 'Mindscape.LightSpeed.Mapping.InMemoryDeleteCascader.BuildCascadingDeletes'
• In a console window used in the app we get the following query (logging activated for LS):

SELECT

   MaterialsData.Id AS "MaterialsData.Id"

FROM

   MaterialsData

WHERE

   MaterialsData.PathId = 1

--> Time: 0 ms

• In the console we get the following error and stacktrace.

The value "1" is not of type "Mindscape.LightSpeed.Entity" and cannot be used in this generic collection.

Parameter name: value

   at System.ThrowHelper.ThrowWrongValueTypeArgumentException(Object value, Type targetType)

   at System.Collections.Generic.List`1.System.Collections.IList.Add(Object item)

   at ☼.♫.?(AliasedTypeModel , QueryExpression , Order , Group , String , Boolean , Boolean )

   at ♣.►.?(LightSpeedContext , List`1 , QueryExpression , Order , Group , String , Boolean , Boolean )

   at ☼.♫.?(AliasedTypeModel , IList , String , Boolean )

   at ☼.♫.?(TypeModel , Query , IList )

   at ♣..?(Query , TypeModel , IList )

   at ♣..?(Query , IList )

   at Mindscape.LightSpeed.UnitOfWork.Find(Query query, IList results)

   at Mindscape.LightSpeed.UnitOfWorkBase.Find(Query query)

   at Mindscape.LightSpeed.ServiceModel.DistributedUnitOfWorkService.Find(String typename, Query query)

• Stacktrace inside VS looks this way:

Server stack trace: 

   at System.ServiceModel.Channels.ServiceChannel.ThrowIfFaultUnderstood(Message reply, MessageFault fault, String action, MessageVersion version, FaultConverter faultConverter)

   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)

   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)

   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)

   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)

   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 

   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)

   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)

   at Mindscape.LightSpeed.ServiceModel.IDistributedUnitOfWorkContract.Find(String typename, Query query)

   at Mindscape.LightSpeed.ServiceModel.DistributedUnitOfWork.Find(Query query, IList results)

   at Mindscape.LightSpeed.Mapping.InMemoryDeleteCascader.UpdateModel(UnitOfWorkBase , AssociationModel , QueryExpression )

   at Mindscape.LightSpeed.Mapping.InMemoryDeleteCascader.BuildCascadingDeletes(Entity , UnitOfWorkBase , TypeModel , QueryExpression )

   at Mindscape.LightSpeed.Mapping.InMemoryDeleteCascader.Cascade(Entity , UnitOfWorkBase )

   at Mindscape.LightSpeed.ServiceModel.DistributedUnitOfWork.Remove(Entity entity)

   at CTech.Visualization.Model.Repository`1.Delete(Entity entity)

   at EnterVolArcGis.Modeling.Data.ViewModels.PathsViewModel.RemovePath() in C:\Development\C Tech\Dev-EnterVol for ArcGIS\EnterVolArcGis\Modeling\Data\ViewModels\PathsViewModel.cs:line 293

I am pretty lost on why this is happening (other entities delete perfectly, not sure what is happening with this one). Any ideas or any other info that could be useful? (I'm trying to build a repo, no luck so far in my test case with your stories/comment example).

Regards,

Vicente

Thanks - I am pretty sure I can see how this might happen so I should be able to set up a repro case here to validate that - will advice is that proves to turn out to be a dead end but Im fairly confident I know whats going on here :)

Jeremy

Hi Vicente,

I believe I have managed to repro this (certainly the same class of issue) so Ive added some additional functionality into the DistributedUnitOfWork to cater for this. The problem stems from a Find with IdentifiersOnly query being issued which is not something that was previously handled by the DistributedUnitOfWork. Ive added in support for this and I believe Ive patched the paths where this will be used either automatically or via a manual call and these changes will be in the next nightly build.

Let me know if there are any lingering issues around this that you are seeing.

Thanks!

Jeremy

Hi Jeremy!

it seems our issue has been fixed, thanks a lot as usual! Regards,

Vicente