Fluent NHibernate HasMany where source is a comma separated string of Ids

Im' trying to wrap my head around fluent nHibernate while trying to do this kind of mapping:

public class ClassA : Entity
{
   publ开发者_StackOverflowic virtual string SomeField { get; set; }
}

public class ClassB : Entity
{
   public virtual string ClassAIds { get; set; }
   public virtual IList<ClassA> ClassAList { get; set; }
}

Where Entity basically ensures that both classes have Id field as their primary database key.

Database would look like:

 table ClassA:
   int Id,
   varchar(25) SomeField


 table ClassB:
   int Id,
   varchar(50) ClassAIds

I'm trying to write some map so that ClassB object would be populated with ClassA entities into ClassAList. Is it possible to have something similar to:

public void Override(AutoMapping<ClassB> mapping)
{  
   mapping.HasMany(x => x.ClassAIds.Split(new char[] { ',' }).Select(i => int.Parse(i)).ToList()).KeyColumn("Id");
}

I don't really understand how to pass a target class type and if it is possible to achieve this at all.

I don't think you can do what you are asking. I think your best bet would be to map it as it appears in the database and handle the loading of that ClassAList collection outside of the mapping. I would set your automapping up to ignore the collection. This is just not really a good way to handle relationships from a database perspective.