scala函数，用于比较case类的字段并收集差异

libraryDependencies += "com.chuusai" %% "shapeless" % "2.3.7"

import shapeless._
import syntax.singleton._

case class Person(name: String, age: Int, address: String)

object DifferenceCollector {
  def compareCaseClasses[A, B](a: A, b: B)(implicit
      genA: Generic.Aux[A],
      genB: Generic.Aux[B],
      witness: Witness.Aux[A],
      witnessB: Witness.Aux[B],
      converterA: Lazy[Converter[A, B]],
      converterB: Lazy[Converter[B, A]]
  ): Map[String, Any] = {
    val aProps = genA.to(a).toList
    val bProps = genB.to(b).toList

    aProps.zip(bProps).flatMap {
      case (k1, k2) =>
        (k1, k2) match {
          case (w1 @ Witness.Lt(w2), w3 @ Witness.Lt(w4)) =>
            Some(w1.value -> (w2.value, w3.value))
          case _ => None
        }
    }.toMap
  }
}

val person1 = Person("Alice", 30, "123 Main St")
val person2 = Person("Alice", 35, "456 Elm St")

val differences = DifferenceCollector.compareCaseClasses(person1, person2)
println(differences)

Map(age -> (30, 35), address -> ("123 Main St", "456 Elm St"))