scala - json4s parse json partially -


i have json model, contents of attribute depend on other attribute. this:

"paymentmethod": "credit_card", "metadata": {     "cardtype": "visa",     "panprefix": "",     "pansuffix": "",     "cardholder": "",     "expirydate": "" }

so when paymentmethod equals credit_card, metadata object contain attributes described. in case of other payment method, there'll different metadata.

i want handle situation in future-proof way. i'm trying not parse metadata field right away, keep somehow "unparsed" until i've parsed paymentmethod field. i'd take metadata , applied appropriate parsing approach.

however don't know type use scala class field such "late parsed" attributes. i've tried string, jsoninput, jobject, , not suitable (either don't compile or can't parsed). ideas type can use? or, in other words:

case class creditcardmetadata(   cardtype: string,   panprefix: string,   pansuffix: string,   cardholder: string,   expirydate: string)  case class paypalmetadata(...) // etc.  case class paymentgatewayresponse(   paymentmethod: string,   metadata: ???)

you create customserializer parse metadata directly. :

case class paymentresponse(payment: payment, otherfield: string)  sealed trait payment case class creditcardpayment(cardtype: string, expirydate: string) extends payment case class paypalpayment(email: string) extends payment  object paymentresponseserializer extends customserializer[paymentresponse]( format => (    {     case jobject(list(            jfield("paymentmethod", jstring(method)),            jfield("metadata", metadata),            jfield("otherfield", jstring(otherfield))          )) =>       implicit val formats = defaultformats       val payment = method match {         case "credit_card" => metadata.extract[creditcardpayment]         case "paypal" => metadata.extract[paypalpayment]       }       paymentresponse(payment, otherfield)   },   { case _ => throw new unsupportedoperationexception } // no serialization json ))

which can used as:

implicit val formats = defaultformats + paymentresponseserializer  val json = parse("""       {         "paymentmethod": "credit_card",         "metadata": {             "cardtype": "visa",             "expirydate": "2015"         },         "otherfield": "hello"       }       """)  val json2 = parse("""     {       "paymentmethod": "paypal",       "metadata": {           "email": "foo@bar.com"       },       "otherfield": "world"             }     """)  val cc =  json.extract[paymentresponse] // paymentresponse(creditcardpayment(visa,2015),hello) val pp =  json2.extract[paymentresponse] // paymentresponse(paypalpayment(foo@bar.com),world)

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