Fluent nhibernate map list of items - nhibernate

Question

I have a class "Company" which has a list of "Operator"
public class Company
{
public IList<Opertator> Operators {get; set; }
public Int32 Id {get; set;}
}
public class Operator {
public Int32 Id {get; set; }
public Company Company {get; set; }
}
When I mapped as follows:
public class CompanyMapping : ClassMap<Company>
{
public ProductMapping() : base()
{
Id(x => x.Id, "CompanyId").GeneratedBy.Native();
HasMany(x => x.Operators);
}
}
public class OperatorMapping : ClassMap<Operator>
{
public OperatorMapping()
{
Id(x => x.Id);
Reference(x => x.Company);
}
}
I have a UI where user can add operators and remove operators by checking boxes.
in c# code, I query the stored company, and add to the list, or remove from the list.
then send SaveOrUpdate.
My problem is when I add one more operator to existing company, and save/Update, the NHibernate is deleting the whole list, and reinster them again.
I don't want to do that.
Can I have it, that NHibernate will detect the changed items (new items from the list, and insert them, and determine the deleted item and delete them)?
I tried change the mapping to have in the company mapping
HasMany(x => x.Operators).Inverse();
but it end up not deleting at all.
Any help?

Answer 1

Inverse says that the Operator is responsible for the association and you have to set it when adding an Operator to the Company
public class Company
{
public Int32 Id {get; set;}
public ICollection<Opertator> Operators {get; private set; }
public void Add(Opertator operator)
{
Operators.Add(operator);
operator.Company = this;
}
public Company()
{
Operators = new List<Operator>();
}
}
// and
HasMany(x => x.Operators).Inverse();
// use it like
company.Add(new Operator()); // instead of company.Operators.Add(new Operator());