Getting the type for a case class field

[adamw]

I'm trying to get the TypeRepr for a Symbol, obtained via Symbol.caseFields. However, using Symbol.tree is discouraged as an anti-pattern, and getting the TypeRepr from a Tree requires partial pattern matches such as:

val fieldTypeRepr = field.tree match
  case v: ValDef => v.tpt.tpe
  case d: DefDef => d.returnTpt.tpe

What would be the correct way to do this?

[adamw]

Assuming that tpe is the TypeRepr for the case class, field symbols can be accessed using tpe.typeSymbol.caseFields. Then, to obtain the TypeRepr for a field, you can use .memberType, as follows:

tpe.typeSymbol.caseFields.map { fieldSymbol =>
  val fieldTpe = tpe.memberType(fieldSymbol)
  ...
}