Mapping entity oneToMany with fluent nhibernate

Question

The problem appears to be simple however I\'m having so much trouble trying to map this entities. I just can\'t see what am I doing wrong. Can you guys help me?

I have th

Answer 1

After all, with these SQL scripts (adjust for SQL Server in my case)

CREATE TABLE CLIENTE
(
  CORE_ID                      int           NOT NULL,
  CORE_NUMERO_MEDIDOR          VARCHAR(50)
)

CREATE TABLE MEDIDOR
(
  NUMERO_MEDIDOR  VARCHAR(50),
  MARCA_MEDIDOR   VARCHAR(50)
)

With these entities (all properties are virtual)

public class Cliente
{    
    public virtual int ClienteId { get; set; }  
    public virtual IList ListaMedidores { get; set; }   
    public virtual string NumeroMedidor { get; set; }       
}
public class Medidor
{
    public virtual string NumeroMedidor { get; set; }
    public virtual string MarcaMedidor { get; set; }
    public virtual Cliente Cliente { get; set; }
}

and with only this one mapping in place:

public class ClienteMap: ClassMap
{
    public ClienteMap()
    {
        Table("CLIENTE");
        Id(x => x.ClienteId, "CORE_ID");
        Map(x => x.NumeroMedidor).Column("CORE_NUMERO_MEDIDOR");
        HasMany(x => x.ListaMedidores)
            .KeyColumn("NUMERO_MEDIDOR")
            .Component(com =>
            {
                com.ParentReference(y => y.Cliente);
                com.Map(y => y.MarcaMedidor, "MARCA_MEDIDOR");
            })
            .PropertyRef("NumeroMedidor")
            .Table("MEDIDOR")
            // .Inverse() // NO INVERSE, won't work
            .Cascade.All();
    }
}

I can confirm, that this query will work:

var list = session.Query().Fetch(x => x.ListaMedidores).ToList();
var firt = list.First().ListaMedidores.First();
var last = list.First().ListaMedidores.Last();
Assert.IsTrue(firt.MarcaMedidor != last.MarcaMedidor);

BTW, this will be (my preferred) generated xml mapping:

For documentation see:

7.2. Collections of dependent objects