How to get all fields of a case class in Scala?

Often case classes represent the data moved further in the pipeline. For example, they can represent JSON data that will be written into your data warehouse storage or an RDBMS.

If for whatever reason like defining a CREATE TABLE... expression with these fields, you need to get all fields from the case class, you can print them quite easily with the help of reflection:

object TestFieldsPrinting {
  case class MyData(column1: String, column2: Integer)

  import scala.reflect.runtime.universe._

  def classAccessors[T: TypeTag]: List[MethodSymbol] = typeOf[T].members.collect {
    case m: MethodSymbol if m.isCaseAccessor => m

  def main(args: Array[String]): Unit = {
    val fields = classAccessors[MyData].map(field =>", ")

    assert(fields == "column1, column2")