22 fields limit in Scala 2.11 + Play Framework 2.3 Case classes and functions

Question

Scala 2.11 is out and the 22 fields limit for case classes seems to be fixed (Scala Issue, Release Notes).

This has been an issue for me for a while because I use ca

Answer 1

I tried Shapeless "Automatic Typeclass Derivation" based solution proposed in another answer, and it didn't work for our models - was throwing StackOverflow exceptions (case class with ~30 fields and 4 nested collections of case classes with 4-10 fields).

So, we've adopted this solution and it worked flawlessly. Confirmed that by writing ScalaCheck test. Notice, that it requires Play Json 2.4.