I have what I believe to be a simple problem: References don't seem to
be respecting polymorphism for me.
Given the following objects and mappings:
public class Dog
{
public virtual int? Id { get; set; }
public virtual string Name { get; set; }
public virtual DogHouse House { get; set; }
}
public class DogHouse
{
public virtual int? Id { get; set; }
public virtual string Name { get; set; }
}
public class SmallDogHouse : DogHouse
{
}
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-
access="property" auto-import="true" default-cascade="none" default-
lazy="true">
<class xmlns="urn:nhibernate-mapping-2.2" name="FNHTB.Entities.Dog,
FNHTB, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
table="Dogs">
<id name="Id" type="System.Nullable`1[[System.Int32, mscorlib,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]],
mscorlib, Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089">
<column name="Id" />
<generator class="native" />
</id>
<property name="Name" type="System.String, mscorlib,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Name" />
</property>
<many-to-one class="FNHTB.Entities.DogHouse, FNHTB,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" foreign-
key="House_Id" name="House">
<column name="House_id" />
</many-to-one>
</class>
</hibernate-mapping>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-
access="property" auto-import="true" default-cascade="none" default-
lazy="true">
<class xmlns="urn:nhibernate-mapping-2.2"
name="FNHTB.Entities.DogHouse, FNHTB, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=null" table="DogHouses">
<id name="Id" type="System.Nullable`1[[System.Int32, mscorlib,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]],
mscorlib, Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089">
<column name="Id" />
<generator class="native" />
</id>
<discriminator type="String">
<column name="DogHouseStyle" />
</discriminator>
<property name="Name" type="System.String, mscorlib,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="Name" />
</property>
<subclass name="FNHTB.Entities.SmallDogHouse, FNHTB,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" discriminator-
value="S" />
<subclass name="FNHTB.Entities.LargeDogHouse, FNHTB,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" discriminator-
value="L" />
</class>
</hibernate-mapping>
When I run code to get the dog house (reference) from the dog, it
always returns the proxy of the base type (DogHouse), and not a proxy
on the appropriate subtype (SmallDogHouse) as I would expect, even
after referencing the type to ensure lazy loading has triggered.
Here's one small test snippet:
using (var session = dogPersister.OpenSession())
{
SmallDogHouse smallDoghouse = new SmallDogHouse()
{ Name = "Small Doghouse" };
smallDogHousePersister.Create(session, smallDoghouse);
LargeDogHouse largeDoghouse = new LargeDogHouse()
{ Name = "Large Doghouse" };
largeDogHousePersister.Create(session, largeDoghouse);
Dog dog = new Dog() { Name = "Fido", House =
smallDoghouse };
dogPersister.Create(session, dog);
}
using (var session = dogPersister.OpenSession())
{
foreach (var dog in dogPersister.FindAll(session))
{
string test = dog.House.Name;
Console.WriteLine(dog.House.GetType());
}
}
Funny thing is, it works fine for very similar collections of objects,
or non-lazy loaded objects, it seems to be just this reference/many-to-
one case that fails for me.
Can somebody tell me what I'm missing/doing wrong? I'm baffled.
Thanks!
-Eric.
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