How to use Mapper with Changeset?

[pboling]

It is now clear that this is the exact same issue as discussed in the other thread. Seems there is no simple solution currently.

Changeset pre-configured mapping

Greetings, Is it possible to use a pre-configured mapping (used for commands) in the change set pipe? class MyMapper < ROM::Transformer relation :my_relation register_as :my_relation_mapper map do OR do i need to duplicate the mapping logic in Changeset.map (class method): class NewUserChangeset < ROM::Changeset::Create map do <copy duplicate code from my_mapper> What is your suggestion for this case? Many Thanks!