Version: 2.x

Ordering Derivation

Standard Scala library provides a type class called Ordering[A] that allows us to compare values of type A. ZIO Schema provides a method called ordering that generates an Ordering[A] instance for the underlying type described by the schema:

sealed trait Schema[A] {
  def ordering: Ordering[A]
}

Here is an example, where it helps us to sort the list of Person:

import zio.schema._

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

object Person {
  implicit val schema: Schema[Person] = DeriveSchema.gen[Person]
}

val sortedList: Seq[Person] =
  List(
    Person("John", 42),
    Person("Jane", 34)
  ).sorted(Person.schema.ordering)

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