score:1
Accepted answer
I think you also need to bound your type in your format like this
implicit def format[T <: Location: Format]: Format[ShippingPoint[T]] = (
(__ \ "location").format[T] and
(__ \ "type").format[String](exactWordRead("shipping", "error.route.shipping.type"))
)(ShippingPoint.apply, unlift(ShippingPoint.unapply))
score:2
As said by the compiler, on one side you have,
sealed trait Point[T <: Location]
... and on the other side,
case class ShippingPoint[T](???) extends Point[T]
case class PickupPoint[T](???) extends Point[T]
But nothing in the declarations of ShippingPoint and PickupPoint is proving the type parameter is compatible with the constraint <: Location, required to extend Point.
So you need to fix that.
case class ShippingPoint[T <: Location](???) extends Point[T]
case class PickupPoint[T <: Location](???) extends Point[T]
Source: stackoverflow.com
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