I have a requirement that for a given case class with around 30+ Option[T] fields needs to have at least 1 field nonEmpty in order to be valid. Instead of checking each field individually I opted for checking all fields via reflection in a generic way. The code I came up with (based on some other answers in SO as well) was:
import scala.reflect.runtime.universe._
import scala.reflect.runtime.{universe => ru}
// gets all methods of a Case Class
def getMethods[T: ru.TypeTag] = typeOf[T].members.collect {
case m: MethodSymbol if m.isCaseAccessor => m
}.toList
/**
* Returns the value of all Case Class fields
* @param obj case class object
* @return a Sequence of all field values
*/
def getAllCaseClassFieldValues[T: ru.TypeTag](obj: Object): Seq[Any] = {
val mirror = ru.runtimeMirror(getClass.getClassLoader)
getMethods[T].map(m => mirror.reflect(obj).reflectField(m).get)
}
The case class:
case class SampleRequest(field1: Option[String], field2: Option[String], //.... up to 30 or more fields
The code that checks to see if at least 1 is nonEmpty:
val fieldValues = getAllCaseClassFieldValues[SampleRequest](r)
val noneCount = fieldValues.count(_ == None)
val atLeastOneNonEmpty = noneCount < fieldValues.size
I was wondering if there would be a better way for validating this via reflection or other mechanism?
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