NHibernate SubclassMap gives DuplicateMappingException
- by stiank81
I'm using NHibernate to handle my database - with Fluent configuration. I'm not using Automappings. All mappings are written explicitly, and everything is working just fine.
Now I wanted to add my first mapping to a subclass, using the SubclassMap, and I run into problems. With the simplest possible setup an Nhibernate DuplicateMappingException is thrown, saying that the subclass is mapped more than once:
NHibernate.MappingException : Could not compile the mapping document: (XmlDocument)
---- NHibernate.DuplicateMappingException : Duplicate class/entity mapping MyNamespace.SubPerson
I get this with my simple classes written for testing:
public class Person
{
public int Id { get; set; }
public string Name { get; set; }
}
public class SubPerson : Person
{
public string Foo { get; set; }
}
With the following mappings:
public class PersonMapping : ClassMap<Person>
{
public PersonMapping()
{
Not.LazyLoad();
Id(c => c.Id);
Map(c => c.Name);
}
}
public class SubPersonMapping : SubclassMap<SubPerson>
{
public SubPersonMapping()
{
Not.LazyLoad();
Map(m => m.Foo);
}
}
Any idea why this is happening? If there were automappings involved I guess it might have been caused by the automappings adding a mapping too, but there should be no automapping. I create my database specifying a fluent mapping:
private static ISession CreateSession()
{
var cfg = Fluently.Configure().
Database(SQLiteConfiguration.Standard.ShowSql().UsingFile("unit_test.db")).
Mappings(m => m.FluentMappings.AddFromAssemblyOf<SomeClassInTheAssemblyContainingAllMappings>());
var sessionSource = new SessionSource(cfg.BuildConfiguration().Properties, new TestModel());
var session = sessionSource.CreateSession();
_sessionSource.BuildSchema(session);
return session;
}
Again; note that this only happens with SubclassMap. ClassMap's are working just fine!
