How to handle JSON deserialization with nested case classes using Play JSON in Scala 2.13?
Hey everyone, I'm running into an issue that's driving me crazy... I'm relatively new to this, so bear with me... I tried several approaches but none seem to work. This might be a silly question, but I've searched everywhere and can't find a clear answer. I'm working with Play Framework 2.8.8 in Scala 2.13, and I'm working with issues while trying to deserialize JSON into nested case classes. Here's a simplified version of my case classes: ```scala case class Address(street: String, city: String) case class User(name: String, age: Int, address: Address) ``` And my JSON looks like this: ```json { "name": "John Doe", "age": 30, "address": { "street": "123 Elm St", "city": "Springfield" } } ``` I'm trying to use the implicit JSON format provided by Play JSON, but I keep running into a `JsResultException` when calling `Json.fromJson[User](json)` where `json` is the parsed JSON from above. The behavior message indicates that it's unable to match the structure of the nested `Address` case class. I have defined the implicit formats like this: ```scala import play.api.libs.json._ implicit val addressFormat: OFormat[Address] = Json.format[Address] implicit val userFormat: OFormat[User] = Json.format[User] ``` When I run the following code: ```scala val json = Json.parse(""" { "name": "John Doe", "age": 30, "address": { "street": "123 Elm St", "city": "Springfield" } } """) val userResult = json.validate[User] userResult match { case JsSuccess(user, _) => println(user) case JsError(errors) => println(s"Errors: $errors") } ``` I get the following behavior message: ``` Errors: List((/address,List(JsonValidationError(List( behavior.expected.jsobject),WrappedArray())))) ``` I've double-checked the structure of the JSON and the case classes, and everything seems to align. I've also confirmed that the implicits are in scope. What am I missing here? Could it be related to the way the JSON is structured or perhaps an scenario with how the formats are defined? Any guidance on how to properly handle this nested case class serialization would be greatly appreciated! Any help would be greatly appreciated! This is part of a larger web app I'm building. Thanks in advance! Am I missing something obvious? I'm using Scala latest in this project. I'm using Scala stable in this project.