NHibernate 1.2.1

The NHibernate doc states: 'Proxy fetching - a single-valued association is fetched when a method other than the identifier getter is invoked
upon the associated object'

This does not work for me. Any access to the proxy hits the database. Here's my example code:
---
Article art = (Article)session.Load(typeof(Article), 10990);
Console.WriteLine(art.Number);
---
I get the same behavior for proxies loaded for a to-one association - a get on the identity property fires the proxy!


Putting 'show_sql' to 'true' shows an SELECT on the article. If I commend out the Console.WriteLine line, the code behaves as I would expect - no select.

Is the documentation wrong or should this work?

Source
--------
namespace Ista.Amm.Application.BusinessObject
{
public partial class Article
{
protected Article() {}
public Article(int number)
{
this._number = number;
}
private int _number;
virtual public int Number
{
get { return _number; }
}
private string _description;
virtual public string Description
{
get { return _description; }
set { _description = value ; }
}
....

Mapping file
-------------
<?xml version="1.0"?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="BusinessObjects" namespace="Ista.Amm.Application.BusinessObject">
<class name="Article" table="VW1Article">
<id name="Number" access="field.camelcase-underscore" column="number_">
<generator class="assigned"/>
</id>
<property name="Description" access="field.camelcase-underscore" column="description" not-null="true"/>
<many-to-one name="BaseArticle" access="field.camelcase-underscore" class="BaseArticle" unique="true">
<column name="baseArticleNumber"/>
</many-to-one>
<property name="ZeroSettingDevice" access="field.camelcase-underscore" column="zeroSettingDevice" type="YesNo" not-null="false"/>
<property name="NumberOfSensors" access="field.camelcase-underscore" column="numberOfSensors" not-null="false"/>
<property name="VolumeterType" access="field.camelcase-underscore" column="volumeterType" type="Ista.Amm.Application.BusinessObject.VolumeterType, BusinessObjects" not-null="false"/>
<property name="DisplayUnit" access="field.camelcase-underscore" column="displayUnit" type="Ista.Amm.Application.BusinessObject.DisplayUnit, BusinessObjects" not-null="false"/>
</class>
</hibernate-mapping>



DEBUG output:
-----
2008-05-05 16:12:40,127 [DEBUG] NHibernate.Impl.SessionImpl loading [Article#10990] (11)
2008-05-05 16:12:40,393 [DEBUG] NHibernate.Impl.SessionImpl attempting to resolve [Article#10990] (11)

Without invoking the getter the second line does not show up!

Hi,

I don't think NHibernate can do that unless you use the standard access="property" for the identifier. Otherwise NHibernate isn't aware of the accessor (int Number {get;}).

If you change the access to 'property' (the default), then the problem should go away. If you're worried about giving clients access to the mutator (the setter), then the mutator can be marked as protected.





Regards,
Richard

Yes, this helps. I acually changed the mapping to:
---
<id name="Number" access="nosetter.camelcase-underscore" column="number_">
---
to tell Hibernate to use the Getter for getting and direct field access for setting. And everything works as specified.

Access = "property" is not working for me because I may have logic in the Setter.

Cool ... I didn't know about that option.

Thanks for sharing your solution.

Cheers,
Richard