How to turn json to case class when case class has only one field

As Julien answered, you can read single field case classes using this:

case class Person(name: String)val personReads: Reads[Person] =   (__ \ "name").read[String].map { name => Person(name) }

Just a complement, if you want to write:

val personWrites: Writes[Person] =   (__ \ "name").write[String].contramap { (person: Person) => person.name }

Or format (read and write):

val personFormat: Format[Person] =   (__ \ "name").format[String].inmap(name => Person(name), (person: Person) => person.name)

For write and format you have to import this:

import play.api.libs.functional.syntax._

json scala playframework-2.1

Json combinators doesn't work for single field case class.

There are some workarounds which works, like this one:

case class A(value: List[Int])val areads = (__ \ 'value).read[List[Int]].map{ l => A(l) } // covariant map

json scala playframework-2.1

Based on @yokomizor's answer, I found the simplest solution to create a Formatter to be

case class Person(name: String)val personFormatter: Format[Person] =  (__ \ "full_name").format[String].inmap(Person.apply, unlift(Person.unapply))

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