work with public methods parameters

[Mxrynd]

Having toy type example

case class Book(name: String) {
    def timesName(n: Option[Int] = Some(42)) = name * n.get
}
object Book {
    implicit val bookSchema: Schema[Any, Book] = deriving.deriveSchemaInstance[Any, Book]
}

and 1 simple query returning default book I face some inconvenience moments.

1. it works strangly with Option: calling timesName w/o n (which is valid)

query{
  book{
    name
    timesName
  }
}

leads to

{
  "data": null,
  "errors": [
    {
      "message": "java.util.NoSuchElementException: key not found: n"
    }
  ]
}

In addition it does not take default value into account
2) making n not optional, but just int leads generated schema to have parametr with !

To sum up: it would be nice to have input type/argument default value support and (ideally) treating fields with default values as optional during schema generating.
P.S. the same functionality in sangria is implemented with annotation, but unfortenutly it fails to make a field optional

[vigoo]

Thanks for reporting this, I will take a look.
Using the provided default values may be tricky, have to check if it is possible both in Scala 2 and Scala 3 macros. We can always fall back to defining an annotation for it of course.