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Determine whether an association has already been loaded

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AviTzvi

Post subject: Determine whether an association has already been loaded

Posted: Thu Mar 18, 2010 12:22 pm

Newbie

Joined: Thu Mar 18, 2010 12:02 pm
Posts: 2

Hi,
I have a simple model with two entities, let's say Customer and address. The address association is set to "Lazy=true" in the mappings. After the customer has been fetched, in a certain place in the code, I need to determine whether the address has already been fetched or not.
Is there a way to find out?

Thanks,
Avi

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pb00067

Post subject: Re: Determine whether an association has already been loaded

Posted: Fri Mar 19, 2010 7:31 am

Expert

Joined: Tue Jun 16, 2009 3:36 am
Posts: 990

Code:

java.util.Collection collection = customer.getAddresses();
if (collection instanceof  org.hibernate.collection.PersistentCollection) {// is usually not true on new objects created in transaction
       boolean isloaded  = ((org.hibernate.collection.PersistentCollection) collection).wasInitialized();
}

This should work in the case of a ...ToMany relation.

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pb00067

Post subject: Re: Determine whether an association has already been loaded

Posted: Fri Mar 19, 2010 7:33 am

Expert

Joined: Tue Jun 16, 2009 3:36 am
Posts: 990

Oh, I oversight that here we are in NHibernate not in Hibernate forum.
Anyway I hope there exist analow apis in NHibernate.

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AviTzvi

Post subject: Re: Determine whether an association has already been loaded

Posted: Sun Mar 21, 2010 5:23 am

Newbie

Joined: Thu Mar 18, 2010 12:02 pm
Posts: 2

Hi,
Thanks for the replay. Although it is relevant to Hibernate, it is very much like it supposed to be in NHibernate:

((NHibernate.Collection.PersistentSet)MyCollection).WasInitialized

Maybe you know what to do in case that my association isn’t a collection. Let's say that every customer has only one address (the address is a different class that located on other table than the customer)

Thanks,
Avi

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pb00067

Post subject: Re: Determine whether an association has already been loaded

Posted: Mon Mar 22, 2010 3:33 am

Expert

Joined: Tue Jun 16, 2009 3:36 am
Posts: 990

Again, I can only tell how I would do it in Hibernate:

Code:

boolean initialized = true;  
if (customer instanceof org.hibernate.proxy.HibernateProxy) {
       initialized = ! ((org.hibernate.proxy.HibernateProxy) customer).getHibernateLazyInitializer().isUninitialized();
}
// else initialized = true;  non-proxy references are always loaded 

I hope there exist analog api in NHibernate.

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