NHibernate intermediate table mapping by code - nhibernate

Question

I know that there are similar questions to this topic on stackoverflow, but none of them could solve my problem. I'm stuck with it, for at least two days now. So here is my question:
I have two tables with a Many-To-Many relationship, like this:
Department * - * Person
I don't want to use a Many-To-Many relationship, but two Many-To-One and define the link table as entity.
The link table should be called "Lam".
My entities
public class Department
{
public virtual int Id { get; set; }
public virtual IList<Lam> Lams { get; set; }
}
public class Person
{
public virtual int Id { get; set; }
public virtual IList<Lam> Lams { get; set; }
}
public class Lam
{
public virtual Department Department { get; set; }
public virtual Person Person { get; set; }
}
My mappings
public class DepartmentMapping : ClassMapping<Department>
{
public DepartmentMapping()
{
Id(x => x.Id, map => map.Generator(Generators.Native));
Bag(x => x.Lams, col =>
{
col.Key(k => k.Column("DepartmentId"));
col.Inverse(true);
}, r => r.OneToMany());
}
}
public class PersonMapping : ClassMapping<Person>
{
public PersonMapping()
{
Id(x => x.Id, map => map.Generator(Generators.Native));
Bag(x => x.Lams, col =>
{
col.Key(k => k.Column("PersonId"));
col.Inverse(true);
}, r => r.OneToMany());
}
}
Pairing mapping:
public class LamMapping : ClassMapping<Lam>
{
public LamMapping()
{
ManyToOne(x => x.Department, map =>
{
map.Column("DepartmentId");
});
ManyToOne(x => x.Person, map =>
{
map.Column("PersonId");
});
}
}
If I try to run my application, I get the following error message:
Incorrect syntax near 'Index'. If this is intended as a part of a
table hint, A WITH keyword and parenthesis are now required. See SQL
Server Books Online for proper syntax.
Could someone please just tell me, whats wrong with my code?

Answer 1

The mapping as is is correct (at least the same was working for me). So, the question is from where is coming your exception?.
Let's have a SQL SELECT query over your simplified table/entity Person:
SELECT id FROM Person
That would work.
But if - in a not shown part of your mapping - exists Person's some property, let's say Index like this:
// entity
public class Person
{
...
// C# property named Index
public virtual int Index { get; set; }
...
// mapping
public class PersonMapping : ClassMapping<Person>
{
public PersonMapping()
{
...
// that by default would be column Index
Property(x => x.Index)
That would lead to SELECT like this
SELECT id, Index FROM Person
And in SQL Server worlds, that will cause error:
Msg 1018, Level 15, State 1, Line 1
Incorrect syntax near 'Index'. If this is intended as a part of a table hint, A WITH keyword and parenthesis are now required.
So, because your mapping shown above is correct, I would suspect some part like this
If this is the case, we can use
...
Property(x => x.Index, x => { x.Column("[Index]"); });