Fluent NHibernate - Error with HasMany in new version - visual-studio-2010

Question

I Upgrade my NHibernate for 3.1.0.4000 and Fluent for 1.2.0.712 and have some problems with HasMany...
my entities:
public class MateriaPrima
{
public virtual int Id { get; set; }
public virtual string Description { get; set; }
public virtual DateTime Date { get; set; }
public virtual decimal Price { get; set; }
}
public class Product
{
public virtual int Id { get; set; }
public virtual IList<ProductMateriaPrima> ListMateriaPrima { get; set; }
public virtual string Description { get; set; }
public virtual decimal Price { get; set; }
public virtual DateTime Date { get; set; }
public Product()
{
this.ListaMateriaPrima = new List<ProductMateriaPrima>();
}
}
public class ProductMateriaPrima
{
public virtual int Id { get; set; }
public virtual Product Product {get;set;}
public virtual MateriaPrima MateriaPrima { get; set; }
public virtual decimal PrecoCusto {get;set;}
}
And Maps:
public class MateriaPrimaMap : ClassMap<MateriaPrima>
{
public MateriaPrimaMap()
{
Id(m => m.Id).Length(11).Not.Nullable();
Map(m => m.Description).Length(90).Not.Nullable();
Map(m => m.Date).Not.Nullable();
Map(m => m.Price).Not.Nullable();
}
}
public class ProductMateriaPrimaMap : ClassMap<ProductoMateriaPrima>
{
public ProductMateriaPrimaMap()
{
Id(c => c.Id).Length(11);
Map(c => c.Price).Not.Nullable();
References(c => c.MateriaPrima).Column("IdMateriaPrima").Not.LazyLoad();
References(c => c.Product).Column("IdProduct").Not.LazyLoad();
}
}
public class ProdutoMap : ClassMap<Produto>
{
public ProdutoMap()
{
Id(m => m.Id).Length(11).Not.Nullable();
Map(m => m.Description).Length(90).Not.Nullable();
Map(m => m.Price).Length(10);
Map(m => m.Date).Length(12);
Map(m => m.Active).Not.Nullable();
HasMany(x => x.ListaMateriaPrima)
.Table("ProdutoMateriaPrima")
.KeyColumn("IdProduto")
.KeyColumn("IdMateriaPrima")
.Inverse()
.Cascade.AllDeleteOrphan();
}
}
When i try to search, i got the error: {"Unknown column 'listamater0_.MateriaPrima_id' in 'field list'"}
This error don´t happen when i had the old version of Nhibernate and Fluent...
Someone know what´s happening?
Thanks for the help...

Answer 1

This error happend because you didn't set collumn name of Id property, default pattern for id is: entityname_id.
And now in ProductMateriaPrimaMap class you wrote:
References(c => c.MateriaPrima).Column("IdMateriaPrima")
This mean that in you MateriaPrimaMap class you should have Id with collumn name: IdMateriaPrima, but default you have name: MateriaPrima_Id.
I can't say where the problem is exactly because you didn't show the query. But i know that this error happend when Id column name is diffrent from Reference column name.