Bidirectional mapping about chimney HOT 3 CLOSED

Also interested in this kind of feature. When you need transformation both ways, it would be nice to be able to define the field mapping only once.

from chimney.

If anyone is interested in implementing such thing, it would require:

• creating some case classes, let's call them

  case class IsoTransformer[L, R](toRight: Transformer[L, R], toLeft: Transformer[R, L])
  case class CodecTransformer[Domain, DTO](encode: Transformer[Domain, DTO], decode: PartialTransformer[DTO, Domain])

• creating IsoTransformerDefinition[L, R] and CodecTransformerDefinition[Domain, DTO] similar to TransformerDefinition and PartialTransformerDefinition
• providing macros similar to existing macros on 2 & 3
  • it can be pretty much done with copy-paste-edit
• providing IsoTransformer*Spec and CodecTransformer*Spec for: ImplicitResolution, JavaBean, Product, Sealed, ValueType etc

All in all, it is not a difficult work, so most new contributors should be able to do it, but it is also not a one liner to implement during afternoon.

from chimney.

Maybe you can utilize isomorphisms from other libraries (like monocle.Iso), and define two implicit Transformer instances based on that?

from chimney.