Play2 Scala Json custom Format Combinator

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 (e.g. 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

Onilton Maciel · Accepted Answer · 2015-11-02 19:49:02Z

2

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:

answered Nov 2, 2015 at 19:49

Onilton Maciel

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1 Comment

tano Over a year ago

I had a quick look at those docs. I think this is a little bit beyond my Scala knowledge :)

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