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Morpher is a data transformation algebra with optional tracked evaluation.

It can be used at various places:

  • Domain to JSON and vice versa, for building rest style APIS
  • Domain to document db and vice versa, for building mappers
  • Form processing
  • ...


This library is in "moving to MDD from spike mode".

Mutation coverage

I use so called "implicit coverage". A term that was invented by the rom-team during mutation testing. Later when this library is not under steady flux anymore I'll switch to explicit coverage.


Install the gem morpher via your preferred method.


See specs, Public Evaluator API is stable and there are ongoing 0.x.y releases for early adopters.



  • Fork the project.
  • Make your feature addition or bug fix.
  • Add tests for it. This is important so I don't break it in a future version unintentionally.
  • Commit, do not mess with Rakefile or version (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
  • Send me a pull request. Bonus points for topic branches.


See LICENSE file.