ASP.NET MVC / EF4 / POCO / Repository - How to Update Relationships?

Question

I have a 1..* relationship between Review and Recommendations.

The relevant portion of my model (which is also the POCO mapped by E

Answer 1

Working with detached object graphs is my favorite drawback of EF. Simply pain in the ass. First you have to deal with it at your own. EF will not help you with it. It means that in addition to Review you also have to send some information about made changes. When you attach Review to context it sets Review all Recommendation and all relations to Unchanged state. ApplyCurrentValues works only for scalar values as you have already found. So you have to use your additional information about made changes and set state of relations to Added by using ObjectContext.ObjectStateManager.ChangeRelationshipState.

I personaly gave up with this approach and I'm loading object graph from DB first merging my changes into attached graph and save it.

I answered similar question more deeply here.