Dynamic value readers for abstract classes?

[saifellafi]

Hi,

How would you approach an abstract reader?

eg:

abstract class AbClass
case class C1Class(x1: Int, x2:String) extends AbClass
case class C2Class(x3: String) extends AbClass

Then have a config which looks like

{
"C2Class": {
"x1": "foo"
}
}

and let config.as[AbClass] do its job inferring the type. Without having to list all possible case classes as None options by default

Thanks,
Saif

[kailuowang]

As of now you would need to write your own custom ValueReader[AbClass] which looks at the field name and determine which sub-class is in the config and use the appropriate ValueReader for that subclass to read the value. The ValueReader for subclasses can be automatically generated by import net.ceedubs.ficus.readers.ArbitraryTypeReader._ and then implicitly[ValueReader[C1Class]] .
We would also love to see efforts to enhance the current macro to handle coproduct.