play framework scala: json readers example

json_reader_example.sc

// for `play console`
// enter to paste mode before by running `:paste`

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

case class Account(name: String)

case class Repo(
    name: String,
    owner: Account,
    description: Option[String] = None)


val objJson = """{"name": "one", "d": "some description"}"""
val objJson2 = """{"name": "two"}"""

val objs = s"""[$objJson, $objJson2]"""

val parsed1: JsValue = Json.parse(objJson)

val parsed2: JsValue = Json.parse(objJson2)

//reader for object
val reader: Reads[Repo] =
  (
    (__ \ "name").read[String] and
    (__ \ "d").readNullable[String] //Optional field (None for 'null' or key not exists)
  ) apply((name, d) => Repo(name, Account("user_acc"), d))

//construct reader for list of objects
val listReader = Reads.seq[Repo](reader)


val resBuffer = scala.collection.mutable.ListBuffer[Repo]()

val tuples1 = reader.reads(parsed1)
tuples1 foreach {
  resBuffer.append(_)
}

val tuples2 = reader.reads(parsed2)
tuples2 foreach {
  resBuffer.append(_)
}

val parsedObjs: JsValue = Json.parse(objs)
val readObjs = listReader.reads(parsedObjs)
readObjs foreach {
  resBuffer ++= _
}

resBuffer