Hi, i'm a newbie in NHibernate. I've a question tham maybe seems stupid, but i can't get it work.

I've 3 tables

A <-> RelAB <-> B
Table A
CodA Guid PrimaryKey
xxx
yyy

Table B
CodB Guid PrimaryKey
ooo
zzz

Table B
CodA Guid ForeignKey (To A)
CodB Guid ForeignKey (To B)
Date
InsertedBy

I've created 3 mapping files and 3 classes to handle it

Classes :

Classe A

class A {
private Guid CodA;
private String xxx;
private String yyy;

private System.Collections.Generic.ICollection<RelAB> relacoesSet;
public virtual System.Collections.Generic.ICollection<RelAB> RelacoesSet
{
get
{
return this.relacoesSet;
}

set
{
this.relacoesSet = value;
}
}

public Entidade()
{
}

...


Classe B

class B {
private Guid CodB;
private String ooo;
private String zzz;

private System.Collections.Generic.ICollection<B> relacoesSet;
public virtual System.Collections.Generic.ICollection<B> RelacoesSet
{
get
{
return this.relacoesSet;
}

set
{
this.relacoesSet = value;
}
}

public Entidade()
{
}

...


Class RelAB

class RelAB
{

private DateTime date;
private string insertedBy;

public virtual DateTime Date
{
get { return date; }
set { date = value; }
}
public virtual string InsertedBy
{
get { return insertedBy; }
set { insertedBy = value; }
}

private A a;
public virtual A ToA
{
get
{
return this.a;
}

set
{
this.a = value;
}
}

private B b;
public virtual B ToB
{
get
{
return this.b;
}

set
{
this.b = value;
}
}

public RelAB()
{
}

}



Mapping Files
a.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="xxxxx.A, xxxxx" table="A">
<id name="CodA" type="Guid">
<generator class="guid" />
</id>
<property name="xxx" type="string" length="256"/>
<property name="yyy" type="String" length="256"/>

<bag name="RelacoesSet"
inverse="true"
lazy="true"
cascade="none">
<key column="CodA"/>
<one-to-many class="xxxxx.RelAB, xxxxx"/>
</bag>
</class>
</hibernate-mapping>



b.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="xxxxx.B, xxxxx" table="B">
<id name="CodB" type="Guid">
<generator class="guid" />
</id>
<property name="ooo" type="string" length="256"/>
<property name="zzz" type="String" length="256"/>

<bag name="RelacoesSet"
inverse="true"
lazy="true"
cascade="none">
<key column="CodB"/>
<one-to-many class="xxxxx.RelAB, xxxxx"/>
</bag>
</class>
</hibernate-mapping>


relab.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="xxxxx.RelAB, xxxxx" table="RelAB">
<composite-id>
<key-many-to-one name="CodA" class="A" column="CodA" />
<key-many-to-one name="CodB" class="B" column="CodB" />
</composite-id>
<property name="Date" type="String" length="20"/>
<property name="InsertedBy" type="String" length="20"/>
</class>
</hibernate-mapping>


The problem is in my composite id. I've tried with
<key-property name="CodA" type="Guid"/>
<key-property name="CodB" type="Guid"/>

but i can't get it work. NHibernate gives me the error "Could not compile the mapping document: RelAB.hbm.xml"

If i set just an id it works.
How can i mapping the relation to A, B and RelAB in classes and in hbm files.

I aprecciate any help.


P.S.- Sorry for my English ;)

Not sure if this will fix everything, but you're going to need to override Equals and GetHashCode in RelAB. (per 5.15 of the documentation: Your persistent class must override Equals() and GetHashCode() to implement composite identifier equality. It must also be Serializable. )

Can you paste the full error?

Thanks for your reply.
I forgot to put that, but i already override those methods.

My big problem is that i want to map the relation between A and B in RelAB. That table has extra attributes.

I've tried everything, but i can't get it work.

Is realy necessary to have the class RelAB to map the extra columns ?
Is realy necessary to have a composite element.

I don't know if the problem is in the mapping files, or in the classes.

If anyone has an example how to implement it i would apreciate the help.

The error occurs when i try to access the collection RelAB in class A. The first error is "failed to initialize laizy collection."


Thanks