Play2 Scala Json自定义格式组合器

Question

I've the following model:

case class Person(name: String, age: Int, job: Option[String])

object PersonJsonFormats {
    implicit val personFormat = Json.format[Person]
}

Converting a Person object into Json (eg with Json.toJson(person) ) produces the following Json object.

{
    "name": "John",
    "age": 10,
    "job": "gardener"
}

What should I change in order to produce an object like the following instead?

[
    {
        "name": "name",
        "value" : "John"
    },
    {
        "name": "age",
        "value": 10
    },
    {
        "name": "job",
        "value": "gardener"
    }
]

I know I could write custom Reads and Writes but I want to write something I can apply to every case class

Answer 1

If you don't want to write custom Reads and Writes and want something that you can apply to every case class , you probably should use macros to to this.

That's how the original automatic implicit converters are build.

Places to look:

• Json.scala

• JsMacroImpl.scala