Hi! At Synectique sometimes we use Ston to export models that contains some MooseEntities. Moose entities been complex, we usually export only the moose name of the entity then we retrieve the entity during the import. But we did not find any "easy" way to do this in Ston. I used voyage and it has a system like this. Example: Amount class>>mongoCurrency <mongoDescription> ^ VOMongoToOneDescription new attributeName: 'currency'; accessor: (MAPluggableAccessor read: [ :amount | amount currency abbreviation ] write: [ :amount :value | amount currency: (Currency fromAbbreviation: value) ]); yourself With this Voyage know how to read/write the instance variable "currency". I think it would be cool to be able to easily customize import/export variables with Ston. Maybe it is already possible but I missed the way to do it? I would like your thoughts about that. :) -- Cyril Ferlicot https://ferlicot.fr http://www.synectique.eu 2 rue Jacques Prévert 01, 59650 Villeneuve d'ascq France