Wiring of values in scope

[mariussoutier]

I often have something akin to this:

case class Ad(adId: Int, adName: String)
case class AdImpression(adId: Int, adName: String, impressions: Int, clicks: Int, ctr: Double)

val impressions = calculateImpressions()
val clicks = calculateClicks()
val ctr = calculateCtr()
ad
  .into[AdImpression]
  .withFieldConst(_.impressions, impressions)
  .withFieldConst(_. clicks, clicks)
  .withFieldConst(_. ctr, ctr)
  .transform

This is a lot of boilerplate. I think it would be nice if there was a flag to just "wire" values in scope with the same name (if this is possible). I know MacWire does it by type, not by name.

val impressions = calculateImpressions()
val clicks = calculateClicks()
val ctr = calculateCtr()
ad
  .into[AdImpression]
  .wireFromScope
  .transform

[MateuszKubuszok]

You mean like merging with the object that we're in:

ad
  .into[AdImpression]
  .withFallback(this) // or instead of this, some object having these definitions
  .transform

?

I don't think anyone would want to implement, test and document the actual scope lookup.

[mariussoutier]

Merging is also pretty cool but not exactly what I was thinking of. More like MacWire's wireSet which just creates a set of all available values which have a given type.

[MateuszKubuszok]

Yes, I understood - but someone would have to implement it, test it, on Scala 2 and 3, write documentation etc, and TBH currently Chimney in is in a "community support" mode:

I can help people start contributing, but I no longer work in projects that use it, when I did 90% of what I needed was available in 0.8, and 100% in 1.7.0, and if not for the changes with 3.7.0 givens, I would completely step down from the development and let other people take the wheel.

You can contribute such feature, I can happly guide willful contributors, but this particular thing would be a discouragingly lot of work.