parse json string to a scala object - json

Question

I use play framework version 2.2.1 with scala.
I have a large json-string that i wish to construct an object from.
I have written the formatters for the classes.
My question is what are the steps i am supposed to cast that string to concrete class.
e.g of code that i've tried:
val something = scala.util.parsing.json.JSON.parseFull(jsonContent).asInstanceOf[HsmTenant] //This has stucked my debug session and operation never completes
Or
val concreteClass = Json.parse(jsonContent).asInstanceOf[T] //message: "Error processing request - Failed to migrate, Exception=play.api.libs.json.JsObject cannot be cast to migration.hsm.HsmTenant"
When trying:
Json.parse(jsonContent).as[T]
I get the following:
Multiple markers at this line
- No Json deserializer found for type migration.hsm.HsmTenant. Try to implement an implicit Reads or Format for this type.
- not enough arguments for method as: (implicit fjs: play.api.libs.json.Reads[migration.hsm.HsmTenant])migration.hsm.HsmTenant. Unspecified value
parameter fjs.
- No Json deserializer found for type migration.hsm.HsmTenant. Try to implement an implicit Reads or Format for this type.
- not enough arguments for method as: (implicit fjs: play.api.libs.json.Reads[migration.hsm.HsmTenant])migration.hsm.HsmTenant. Unspecified value
parameter fjs.
- Line breakpoint:HsmParser [line: 16] - parse(jsonContent: String): migration.hsm.HsmTenant
My read and writes looks like: and they compile:
trait HsmFormats {
implicit val hsmRetailerFormat = Json.format[Retailer]
implicit val hsmproductFormat = new Format[HsmProduct]
{
def writes(item: HsmProduct): JsValue =
{
val retailers = item.r.getOrElse(List[Retailer]())
val images = item.images.getOrElse(List[String]())
Json.obj(
"u" -> item.u,
"s" -> item.s,
"z" -> item.z,
"n" -> item.n,
"v" -> item.v,
"vu" -> item.vu,
"t" -> item.t,
"r" -> retailers,
"images" -> images
)
}
def reads(json: JsValue): JsResult[HsmProduct] =
{
val retailers = (json \ "r").as[Option[List[Retailer]]]
var retaliersReal:Option[List[Retailer]] = None
if (retailers.isDefined)
{
retaliersReal = Some(retailers.get)
}
val images = (json \ "images").as[Option[List[String]]]
var imagesReal:Option[List[String]] = None
if (images.isDefined)
{
imagesReal = Some(images.get)
}
JsSuccess(new HsmProduct(
(json \ "u").as[String],
(json \ "s").as[Int],
(json \ "z").as[Int],
(json \ "n").as[String],
(json \ "v").as[String],
(json \ "vu").as[String],
(json \ "t").as[String],
retailers,
imagesReal
))
}
}
implicit val hsmTenantFormat = new Format[HsmTenant]
{
def writes(tenant: HsmTenant): JsValue =
{
val items = tenant.items.getOrElse(List[HsmProduct]())
Json.obj(
"items" -> tenant.items,
"prefixAndroid" -> tenant.prefixAndroid,
"prefixIOS" -> tenant.prefixIOS,
"er" -> tenant.er,
"erMessage" -> tenant.erMessage
)
}
def reads(json: JsValue): JsResult[HsmTenant] =
{
val items = (json \ "items").as[Option[List[HsmProduct]]]
var itemsReal:Option[List[HsmProduct]] = None
if (items.isDefined)
{
itemsReal = Some(items.get)
}
JsSuccess(new HsmTenant(
itemsReal,
(json \ "prefixAndroid").as[String],
(json \ "prefixIOS").as[String],
(json \ "er").as[Int],
(json \ "erMessage").as[String]
))
}
}

Answer 1

This should work if your Formats are correct:
import play.api.libs.json.Json
Json.parse(jsonContent).as[T]

Answer 2

What was the problem ?
It was not issue if import the Formats class, my format is a trait, so i must extend that trait in classes i use it.