Unique Id generator for models in Scala applications

UniqueItemIDGen.scala

import org.joda.time.DateTime

import scala.annotation.tailrec
import scala.util.Random

object RANStream {
  val randomAlphaNumIterator = Random.alphanumeric.iterator

  @tailrec
  def getRandomString(length: Int, acc: String = ""): String = {
    require(length >= 0, message = "length needs to be non-negative")
    if (length == 0) acc
    else getRandomString(length - 1, randomAlphaNumIterator.next().toString)
  }
}

trait UiidGen {

  val key: String

  def generateUiid: String = {
    val longTime = DateTime.now().getMillis()
    val hexTime = longTime.toHexString

    (key + "_" + hexTime + "_" + RANStream.getRandomString(20))
      .substring(0, 32)
  }

}


object MyModel extends UiidGen {
  override val key: String = "MyModel"
}