Getting `class must either be declared abstract scala` with sealed trait

Question

I'm reading through docs and trying to understand what Scala traits and objects and all these fun things are, but still unable to figure out how to resolve this problem.

sealed trait MyTrait {
  val username: Option[String]
  val password: Option[String]
}

sealed trait OptionTrait{
  val types: Option[Types]
}

case class Types(
  col: String
)

case class MyTraitTypes(
  user: String
  password: String
)

case class MyClass (
  auth: Option[MyTraitTypes]
  type: Option[Types]
) extends AnotherClass with OptionTrait with MyTrait

The error is on MyClass , where it wants Class must either be declared abstract or implement abstract member password: Option[String] in MyTrait`. Any help please?

-----edit

so my confusion is that OptionTrait works just fine. I can't distinguish the difference between these two (the working one vs non-working one). Because it doesn't seem like that class Types is doing anything either.

Answer 1

There should not be comma after username . Also auth should be in parentheses rather than braces.

Try

class AnotherClass

sealed trait MyTrait {
  val username: Option[String]
  val password: Option[String]
}

case class MyClass(
  auth: Option[MyTrait]
) extends AnotherClass with MyTrait {
  override val username: Option[String] = ???
  override val password: Option[String] = ???
}

where you are supposed to implement methods instead of ???