I think using an interceptor for this is the wrong approach.
Instead, you can define your property as follows:
public virtual int ChildCount
{
get { return Children.Count(c => c.IsOpen); }
}
And map it as
<property name="ChildCount" access="readonly" />
And you're done. No hacking.
This is exactly how I'm doing it now.
Diego
On Wed, May 12, 2010 at 15:14, pvginkel <[email protected]> wrote:
> I am using NHibernate 2.1.2.4000 with LinFu proxy generater and I have
> the following problem.
>
> Basically, I have a parent child mapping:
>
> <class name="Parent">
> <id name="Id">
> <generator class="native" />
> </id>
> <property name="ChildCount" />
> <set name="Children" inverse="true">
> <key column="ParentId" />
> <one-to-many class="Child" />
> </set>
> </class>
>
> <class name="Child">
> <id name="Id" column="Id">
> <generator class="native" />
> </id>
> <property name="IsOpen"/>
> <many-to-one name="Parent" column="ParentId" />
> </class>
>
> When I a child is added, deleted or the IsOpen flag changes, the
> ChildCount must be updated. I do this in an interceptor. Creating or
> deleting the child works perfectly, and the count gets correctly
> updated. Changing the child, updating the ChildCount in the
> OnFlushDirty interceptor method however does not work.
>
> I've tried everything I could think of. In a few of my tries, I got an
> exception in the transaction.Commit that the object could not be
> reassociated because it had a dirty collection.
>
> My current hypothesis is that NHibernate specifically disallows these
> kinds of updated to e.g. prevent against circular references and never
> ending cascade update cycles. If this is the case, does anybody have
> an alternative to implement these kinds of cascade updates for cached
> field values?
>
> I'm quite out of ideas and would like some assistance.
>
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