我正在尝试重构一些我目前看起来像这样的模型:
case class Person(name: String, age: Int)
object Person {
implicit val reads: Reads[Person] = (
(JsPath \ "name").read[String] and
(JsPath \ "age").read[Int]
)(Person.apply _)
}
看起来像这样的东西:
abstract class BaseModel {
val pk: String // Some stuff here that will be common
}
object BaseModel {
implicit val reads: Reads[BaseModel] // Not sure what to do here
}
这样我就可以做到这一点:
trait MyTrait[Model <: BaseModel] {
// More code here
val body: JsObject = ...
val parsed = body.validate[Model] // Error: There is no implicit value defined for Model
}
case class NewPerson extends BaseModel {...}
object NewPerson {...} // Maybe need to extend something here
class MyController extends MyTrait[NewPerson]
我希望每个模型都定义一个隐式读取值,但我不确定如何在抽象类的伴随对象中指出这一点。