well... what can I say ?....
If you are a ConfORM user you will see which is the mapping pattern for a
bidirectional-one-to-many with *one-shot-delete* :
public class Item
{
private ISet<Bid> _bids;
public long Id { get; private set; }
public ISet<Bid> Bids
{
get { return _bids; }
}
}
public class Bid
{
public long Id { get; private set; }
public Item Item { get; set; }
public Double Amount { get; private set; }
public string Code { get; private set; }
}
The whole mapping in ConfORM is :
public void MapDomain(ObjectRelationalMapper orm)
{
orm.TablePerClass(new[] { typeof(Item), typeof(Bid) });
orm.Patterns.PoidStrategies.Add(new NativePoidPattern());
}
*Yes! only two lines!*
And the result XML is (for those about to rock) :
<class name="Item">
<id name="Id" type="Int64">
<generator class="native" />
</id>
<set name="Bids" access="nosetter.camelcase-underscore" inverse="true"
cascade="all,delete-orphan">
<key column="Item" on-delete="cascade" />
<one-to-many class="Bid" />
</set>
</class>
<class name="Bid">
<id name="Id" type="Int64">
<generator class="native" />
</id>
<many-to-one name="Item" />
<property name="Amount" />
<property name="Code" />
</class>
As you can see ConfORM knows how map the *one-shot-delete* :
<set name="Bids" access="nosetter.camelcase-underscore" inverse="true"
cascade="all,delete-orphan">
<key column="Item" on-delete="cascade" />
<one-to-many class="Bid" />
</set>
btw... backing to our concern if you have time to create a test to pass and
a JIRA ticket we can study a solution.
2010/3/12 DanPlaskon <[email protected]>
> Fabio,
>
> Alright - I see what you're getting at...something like this:
>
> http://elegantcode.com/2009/07/19/nhibernate-2-1-and-collection-event-listeners/
> (but obviously handing validation events)
>
> Also...wouldn't we be interested in
>
> IPreCollectionUpdateEventListener
> IPreCollectionRemoveEventListener
>
> Instead of the "Post" ones?
>
> I imagine these would need to examine only "Size" and "NotNull"
> validation attributes on collections, to ensure that the contraints
> specified were satisfied.
>
> Is this along the lines of what you were thinking?
>
> On Mar 12, 10:55 am, Fabio Maulo <[email protected]> wrote:
> > More than a workaroud we should think about a solution
> > IPostCollectionUpdateEventListener
> > IPostCollectionRemoveEventListener
> >
> > Can you study it a little bit and send me a proposal ?
> >
> > If you have time obviously.
> >
> > btw a JIRA ticket is welcomehttp://216.121.112.228/browse/NHV
> >
> > 2010/3/12 DanPlaskon <[email protected]>
> >
> >
> >
> >
> >
> > > Hello,
> >
> > > I have a "Size" validation constraint specified for a collection on an
> > > entity of mine (Min is set to 1, to specify that the entity must have
> > > at least one child entity in its collection).
> >
> > > This works as expected for the initial creation, however validation
> > > does not occur upon update of the entity if the only change made to it
> > > is to remove all child entities from the collection. I imagine this
> > > occurs because the entity itself is not considered dirty (since the
> > > only changes made were to its collection of child entities), and thus
> > > the ValidatePreUpdateEventListener does not evaluate it at all.
> > > However, this poses a problem, because the entity has technically
> > > entered an invalid state (its collection does not contain any child
> > > entities) and NHibernate is all to happy to remove all child entities
> > > without checking the validity of the parent.
> >
> > > So...that being said...what's the workaround for this? If further
> > > details are required, please don't hesitate to ask :)
> >
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> > --
> > Fabio Maulo- Hide quoted text -
> >
> > - Show quoted text -
>
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