Datamapper ORM: relationship defined as a String

[eluser]emorling[/eluser]
I have a database table that uses strings as primary key. Is it possible to configure Datamapper to create a relationship using a string, rather than an int? Thanks

[eluser]WanWizard[/eluser]
No, Datamapper requires the primary key to be called 'id', and be an int auto increment.

[eluser]emorling[/eluser]
Thanks for reply