Another ModelUpdate issue

Using LightSpeed version 4.0.1534.21185 professional with VS 2010 and SQL 2008 in MVC 4 application. LightSpeedEntityModelBinder.Register(typeof(MyModelUnitOfWork).Assembly); is in gloabal.asax.

I have a situation that I am unable to figure out what is happening, or if I am not doing something correctly. I have an entity that looks like the following, both a view model and a LightSpeed generated model

public class ParentEntity
 {
       public long Id { set; get; }
       other properites
      public int LockVersion { set; get; }
      public List<ChildEntity> ChildEntities { get; set; }
 }

I retrieve the LS model from the database and map it to the view model and it displays fine. I update the parent and post changes and everything is fine. It updates the LockVersion and save the changes. The problem is when I try to update the child entity, it gets the lock version from the parent entity and then I get a concurrency error. Basic st ps in the process are as follows:

1. Get ParentEntity by Id

2. Call UpdateModel(ParentEntity) – if there are changes the EntityState is set to Modified and the changes are saved if I bypass trying to change the child.

3. For the ChildEntity, I have tried getting the child from the ParentEntity and also getting it from the DB by Id using the Id of the ChildEntity in the view model that is being return returned. Even if the parent has no changes, the child us updated with the parent LockVersion and the EntityState is set to modified if the LockVersion is different.

   ViewModel is the model that is populated coming in from the post

   Find parentEntity by id, call UpdateModel(parentEntity) – this works

foreach (var editItem in ViewModel.ChildEntities) {

// ChildEntity childEntity = parentEntity.ChildEntity.FirstOrDefault(mi=>mi.Id==editItem.Id);

//or
             ChildEntity childEntity = uow.FindById< ChildEntity>(editItem.Id);

if (childEntity != null) 

    {

        childEntity.ChangeTracker.TrackingMode = ChangeTrackingMode.ChangesOnly;

        UpdateModel(childEntity); **Problem here

    }

}

uow.SaveChanges();

When UpdateModel is called on the child model, the lock version of the child model is updated to the LockVersion of the ParentModel and the EntityState is changed to Modified, but none of the other properties are updated in the child model. Then the lock version is usually incorrect and throws the error.

Hopefully, it is just something simple I am missing, but I have tried multiple different ways of trying to get this to work.

Thanks for the help.

I think I figured out what was happening here. It had to do with how the view was setting the LockVersion when there are multiple models in the view and tehrefore multiple LockVersions.

I do still have a question about how LockVersion is supposed to work.

I get a model back from the edit post and it has a LockVersion. I get the domain model from the database, and call UpdateModel, but even if the view model LockVersion is different from the domain model LockVersion, it will allow the changes to be saved. Is UpdateModel supposed to change the LockVersion of the domain model during UpdateModel? I am not quite sure what I should expect so that I can program accordingly.

Thanks

Thanks for the added detail - LockVersion could be set given the way in which the binder is implemented but it shouldn't set that field since it will only lead to issues. Ive added in a check for managed fields and this should be merged in for the nightly builds tomorrow. I will update this once this has happened :)

Jeremy