Perhaps I can open up the discussion by providing a bit more
background.  The table relationship can be viewed as such:

Equipment -(r1)- ObjectAttachments -(r2)- Attachments

r1 is defined by Equipment.Id = ObjectAttachments.Object_Id AND
ObjectAttachments.Class = 'Equipment'
r2 is defined by ObjectAttachments.Attachment_Id =
Attachment.Attachment_Id

The thing that is throwing me for a loop is Equipment.Id is an integer
data type and ObjectAttachments.Object_Id is a string.

On Mar 19, 2:11 pm, Colin Bowern <[email protected]> wrote:
> I have a join table where the original table is a numeric type and the
> join table key column is a string type. Legacy decision that I am
> trying to avoid having to change to minimize the risk to the scope of
> work.
>
> HasManyToMany<Attachment>(x => x.Attachments)
>   .Table("ObjectDocuments")
>   .ParentKeyColumn("ObjectId")
>   .ChildKeyColumn("DocumentId")
>   .Fetch.Select()
>   .LazyLoad()
>   .AsBag();
>
> The owning class uses a long (numeric) type for the identifier, while
> the join table uses a string type for the object identifier. How could
> I map this for it to change the data type on the fly? Is there
> something I can use to intercept and do the conversion?

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