Given the following classes/mappings:
public class Person
{
public virtual Guid Id { get; protected set; }
private readonly ISet<Pet> _pets = new HashedSet<Pet>();
public virtual ISet<Pet> Pets
{
get { return _pets; }
}
}
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
namespace="ConsoleApplication1" assembly="ConsoleApplication1">
<class name="Person">
<id name="Id">
<generator class="guid.comb" />
</id>
<set name="Pets" cascade="all" access="nosetter.camelcase-underscore" >
<key column="OwnerId" />
<one-to-many class="Pet" />
</set>
</class>
</hibernate-mapping>
public class Pet
{
public virtual Guid Id { get; protected set; }
public virtual string Name { get; set; }
}
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
namespace="ConsoleApplication1" assembly="ConsoleApplication1">
<class name="Pet">
<id name="Id">
<generator class="guid.comb" />
</id>
<property name="Name"/>
</class>
</hibernate-mapping>
and the following code:
ISessionFactory factory = configuration.BuildSessionFactory();
using(var session = factory.OpenSession())
using(var transaction = session.BeginTransaction())
{
var person = new Person();
person.Pets.Add(new Pet {Name = "Rex"});
session.Save(person);
transaction.Commit();
}
Three queries get issued to the DB:
INSERT INTO Person (HasPets, Id) VALUES (@p0, @p1);@p0 = True, @p1 =
9e3f39b8-616a-44b2-8841-9c060166e810
INSERT INTO Pet (Name, Id) VALUES (@p0, @p1);@p0 = 'Rex', @p1 =
1191cba6-d1f4-4634-9403-9c060166e83e
UPDATE Pet SET OwnerId = @p0 WHERE Id = @p1;@p0 =
9e3f39b8-616a-44b2-8841-9c060166e810, @p1 =
1191cba6-d1f4-4634-9403-9c060166e83e
Now, isn't the UPDATE superfluous? Why can't/won't NHibernate set the
OwnerId, in the 2nd INSERT. It does know the Id of the person, because
it did generate it itself, so what's the deal? What am I missing?
Krzysztof
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