Okay,
I just committed initial support for this.
Given the following mapping:
<class name="Order" table="Orders">
<id name="Id">
<generator class="assigned" />
</id>
<many-to-one name="Payment" *force-load-on-property-access="true"*/>
</class>
<class name="Payment" abstract="true">
<id name="Id">
<generator class="assigned" />
</id>
<discriminator column="Type" type="System.String"/>
<subclass name="WireTransfer" discriminator-value="WT">
</subclass>
<subclass name="CreditCard" discriminator-value="CC">
</subclass>
</class>
The following test will pass:
[Test]
public void CanGetActualValueFromLazyManyToOne()
{
using (ISession s = OpenSession())
{
var order = s.Get<Order>(1);
Assert.IsTrue(order.Payment is WireTransfer);
}
}
There is one problem, though, and that is the identity map.
public void GhostPropertyMaintainIdentityMap()
{
using (ISession s = OpenSession())
{
var order = s.Get<Order>(1);
Assert.AreSame(order.Payment, s.Load<Payment>(1));
}
}
This seems to all works.
Thoughts?
BTW, I really don't like the force-load-on-property-access, how about call
it ghost="false" ?
On Thu, Dec 31, 2009 at 11:32 AM, Ayende Rahien <[email protected]> wrote:
> I am trying to figure out if we can support the following:
>
> class Comment
> {
> public virtual Post Post {get;set;}
> }
>
> class Post {}
> class Article : Post {}
>
> And *not* generate a PostProxy for the property, but instead detect the
> property access, force a load to return the correct type.
> We can do it right now by specifying lazy=false, but that pre-load the
> entity, while I would like to try to get it to load only on access time.
>
> There are several potential problems with this:
> a) we need to replace the reference on first access, which means that the
> _parent_ must be a proxy as well.
> b) we disallow field access entirely.
> c) identity map issues?
>
> other thoughts?
>
