Writing scala enum into database and reading from it - json

Question

I've been working with some legacy code and I've some troubles.
I have enum written by other guy and now I should write into database some data and read from it. Here some examples:
Here's the enum
object MarketType extends scala.Enumeration {
type MarketType = Value
val Continent, Country, State, City = Value
implicit val marketTypeReads = EnumUtility.enumFormat(MarketType)
}
case class Market(
id: ObjectId = new ObjectId,
name: String,
marketType: Option[MarketType] = None,
)
object Market {
val writes = new Writes[Market] {
def writes(o: Market) = Json.obj(
"id" -> o.id,
"name" -> o.name,
"type" -> o.marketType
)
}
val reads: Reads[Market] = (
(JsPath \ "id").readNullable[ObjectId].map(validateAndFetchObjectId) and
(JsPath \ "name").read[String] and
(JsPath \ "type").read[MarketType]
)(Market.apply _)
implicit val format: Format[Market] = Format(reads, writes)
Here's JSON which I take from front-end and what I should write to the database :
{"name":"Name","type":"state","description":"Desc"}

Answer 1

Change this:
val reads: Reads[Market] = (
(JsPath \ "id").readNullable[ObjectId].map(validateAndFetchObjectId) and
(JsPath \ "name").read[String] and
(JsPath \ "type").read[MarketType]
)(Market.apply _)
Into this:
val reads: Reads[Market] = (
(JsPath \ "id").readNullable[ObjectId].map(validateAndFetchObjectId) and
(JsPath \ "name").read[String] and
(JsPath \ "type").read[MarketType]
)((id, name, type) => Market(id, name, Some(MarketType.withName(type))))
Things to watch out for:
The JSON you posted has the value of the type field in lower case; this will throw a NoSuchElement exception in production when passed into the MarketType.withName() method. Ensure the clients of your API send this field in Camel case
Example: { .., type: "State", .. }