在JSON Circe Scala中遍历所有节点后有条件地添加字段

libraryDependencies += "io.circe" %% "circe-core" % "版本号"
libraryDependencies += "io.circe" %% "circe-generic" % "版本号"
libraryDependencies += "io.circe" %% "circe-parser" % "版本号"

{
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "New York"
  }
}

case class Person(name: String, age: Int, address: Address)
case class Address(street: String, city: String)

import io.circe.parser._

val jsonString = """{"name":"John","age":30,"address":{"street":"123 Main St","city":"New York"}}"""
val json = parse(jsonString).getOrElse(Json.Null)

val person = json.as[Person].getOrElse(throw new Exception("Failed to parse JSON"))

import io.circe.optics.JsonPath._
import io.circe.optics.JsonOptics._

val updatedJson = root.address.each.country.string.modify(_ => "USA")(json)

import io.circe.Printer

val printer = Printer.spaces2
val updatedJsonString = printer.pretty(updatedJson)