Changing the column type of the parent key in many mappings

Question

I have a connection table in which the source table is a numeric type and the key column of the connection table is a row type. An hereditary solution that I am trying to avoid in order to minimize the risk to the amount of work.

HasManyToMany<Attachment>(x => x.Attachments)
  .Table("ObjectAttachments")
  .ParentKeyColumn("ObjectId")
  .ChildKeyColumn("AttachmentId")
  .Fetch.Select()
  .LazyLoad()
  .AsBag();

A native class uses a long (numeric) type for an identifier, while a join table uses a row type for an identifier for an object. How can I match this in order to change the data type on the fly? Is there something I can use to intercept and transform?

Perhaps I can open the discussion by providing a little more background. The relation of the table can be considered as such:

Hardware - (r1) - ObjectAttachments - (r2) - Attachments

• r1 .Id = ObjectAttachments.Object_Id ObjectAttachments.class= 'Equipment'
• r2 ObjectAttachments. Attachment_Id = .Attachment_Id

, , .Id - ObjectAttachments.Object_Id - .

UPDATE. : , . , . , , . :

Table("Attachments");
Id(x => x.Id);
Map(x => x.Name);
Map(x => x.Description);
Map(x => x.MimeType);
Map(x => x.Size);
Map(x => x.Date);
Map(x => x.Content).LazyLoad();
Join("ObjectAttachments", join =>
    {
        join.KeyColumn("Id");
        join.Map(x => x.ObjectId);
    });

Answer 1

. , , .