V1DinosaurTranformer.kt

    override fun transformRequestObjectNode(requestBody: ObjectNode): ObjectNode {
        val eras = objectMapper.createArrayNode()
        if (requestBody["era"].isNotNull()) {
            val era = requestBody["era"] as ObjectNode
            eras.add(era)
        }
        requestBody.remove("era")
        requestBody.set<ArrayNode>("era", eras)
        return requestBody
    }

    override fun transformResponseObjectNode(responseBody: ObjectNode): ObjectNode {
        var era: JsonNode? = null
        if (responseBody["era"].isNotNull()) {
            val eras = responseBody["era"] as ArrayNode
            era = eras.firstOrNull { eraNode ->
                !eraNode.isNull && eraNode.isTextual
            }
        }
        responseBody.remove("era")
        responseBody.set<JsonNode?>("era", era)
        return responseBody
    }