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Can ICriteria.List() return proxy objects?

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Nathan Baulch

Post subject: Can ICriteria.List() return proxy objects?

Posted: Sun Jul 16, 2006 10:46 pm

Beginner

Joined: Thu Dec 08, 2005 6:49 pm
Posts: 49

Is there any way to get a collection of proxy objects from ICriteria.List()? At the moment I'm doing it manually, but it seems like it would be a common thing to do.

Code:

IList<int> ids = session.CreateQuery("select p.ID from Person p").List<int>();
IList<Person> people = new List<Person>(ids.Count);

foreach (int id in ids)
{
    people.Add(session.Load<Person>(id));
}

foreach (Person person in people)
{
    Debug.Assert(!NHibernateUtil.IsInitialized(person));
    //loaded here
    Console.WriteLine(person.Name);
}

Also, is it possible to pick and choose which properties are proxied and which aren't (without multiple tables and one-one relationships)? A lot of my objects have a ValidFromDate property that will be read 90% of the time and I want to avoid loading the rest of the object just because that date was looked at. If I try removing the "virtual" modifier from the property I get an invalid proxy exception.

Nathan

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Nathan Baulch

Post subject:

Posted: Tue Jul 18, 2006 2:08 am

Beginner

Joined: Thu Dec 08, 2005 6:49 pm
Posts: 49

After a little more digging I found the IQuery.Enumerable<T>() method which does return proxies. This cuts my example down to:

Code:

IEnumerable<Person> people = session.CreateQuery("from Person").Enumerable<Person>();

foreach (Person person in people)
{
    Debug.Assert(!NHibernateUtil.IsInitialized(person));
    Console.WriteLine(person.Name); //loaded here
    Debug.Assert(NHibernateUtil.IsInitialized(person));
}

It means that I have to use HQL instead of ICriteria and I have to manually wrap the IEnumerable<T> in an IList<T>, but this shouldn't cause any issues.

Anyway, onto my second question about non-proxied fields in a proxied class. It turns out that the "lazy" attribute is a supported property attribute in Hibernate but hasn't been ported to NHibernate (http://forum.hibernate.org/viewtopic.php?t=962152).

Are there any plans to port this across in the near future?
Should I be creating a Jira feature request?
I noticed that contributions are welcomed. Is this trivial enough for an experienced programmer who's only moderately experienced in NH?

Cheers.

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Nathan Baulch

Post subject:

Posted: Tue Jul 18, 2006 2:41 am

Beginner

Joined: Thu Dec 08, 2005 6:49 pm
Posts: 49

OK, I've spoken too soon again.
Here is the Jira issue: http://jira.nhibernate.org/browse/NH-429.
Now I've just got to find a way to get people to vote for it! (and stop answering my own forum questions while I'm at it)...

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