Nhibernate - Referencing transient objects in disconnected sessions.

Question

Hi,

I've been banging my head against a brick wall for nearly two days on this so any help would be great.

The scenario I've got is basically this.

I have an object called Campaign which I'm creating from scratch in a web client. The Campaign has a reference to another object, Portal. The Portal has been pulled from the database through NHibernate.

When I come to call CreateCampaign(Campaign cmp) NH barfs saying that the reference to Portal is transient and must be saved first. If i create EVERYTHING from scratch then it works fine.

So in short I have a new Campaign instance which references a detached instance of Portal. The cascades are set to 'save-update, merge'.

Do I need to reload all of the detached instances back into the session before I can call session.Save or is it something else I'm not aware of.

Sorry if this seems a little vague and for the lack of any code,..NDAs stop me from posting and code.

Thanks in advance.

Answer 1

You can use ISession.Lock to attach your transient object to the same session that is being used to persist Campaign:

session.Lock(myPortal, LockMode.None);
myCampaign.Portal = myPortal;
session.Save(myCampaign);