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TransactionException - help with .Merge()

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graphicsxp

Post subject: TransactionException - help with .Merge()

Posted: Thu May 14, 2009 11:46 am

Beginner

Joined: Thu Aug 14, 2008 5:31 pm
Posts: 20

Hi,

I'm trying to save an entity of type Post which contains a property CreatedBy of type SimplePerson. Here's the relevant mapping :

Code:

<many-to-one name="CreatedBy" class="Metrica.SimplePerson,Metrica" column="CreatedBy" cascade="merge" />

When I call

Code:

SessionManager.GetCurrentSession().Merge(pPost);

I get the following exception :

object references an unsaved transient instance - save the transient instance before flushing: Metrica.SimplePerson

I believe it is related to the fact that the SimplePerson associated to the Post I'm trying to save is null (in my database the field CreatedBy is nullable). How can I configure the mapping so that I can save my Post whether SimplePerson is null or not ?

Thanks

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