Play scala BSONObjectID Form format

[Nicolas Esteban]

Hi,

I'm currently using ReactiveMongo with Play 2.

I'm trying to use a Form by mapping my model class.

But I got an error when I try to bind my id

case class MyModel(_id: Option[BSONObjectID] = None, value:String)

object MyModel {

...

val form = Form(

  mapping("_id"->optional(of[String] verifying pattern("""[a-fA-F0-9]{24}""".r)), "value" -> text)

)(MyModel.apply(MyModel.unapply)

}

Here is the error : not found: value pattern

Is there a specific format to bind BSONObjectID ?

Thanks in advance !

[Nicolas Esteban]

I found this :

import play.api.libs.json.Format

import reactivemongo.bson.BSONObjectID

object BSONObjectIDFormat extends Format[BSONObjectID] {

    def writes(objectId: BSONObjectID): JsValue = JsString(objectId.stringify)

    def reads(json: JsValue): JsResult[BSONObjectID] = json match {

      case JsString(x) => {

        val maybeOID: Try[BSONObjectID] = BSONObjectID.parse(x)

        if(maybeOID.isSuccess) JsSuccess(maybeOID.get) else {

          JsError("Expected BSONObjectID as JsString")

        }

      }

      case _ => JsError("Expected BSONObjectID as JsString")

    }

 }

But how can I use it ?

[James L. Cain IV]

Probably easier to make your model take a Option[String] and use BSONObjectId.stringify

Jay Cain

Sent from iPhone

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[James L. Cain IV]

Sorry misunderstood this post.  I don't think you need to verify the BSONObjectId. Can u rely on BSONObjectId.generate?

Jay Cain

Sent from iPhone

On Jan 29, 2015, at 3:25 AM, Nicolas Esteban <n.est...@gmail.com> wrote:

--

[Yuriy Grinberg]

I am rather new to play myself

but I think that format that you found is how BSONObjectId reads/writes from/to JSON

and it is already an implicit formatter so if your input was a json string

{"_id":"2354235425265"}

then this code

val id = Json.parse[BSONObjectId](text)

would use that implicit and parse/validate the input text

this is what I understood from https://www.playframework.com/documentation/2.1.0/ScalaJsonRequests

I have started at some point playing with forms but quickly switched to json/ajax etc.

[Nicolas Esteban]

Thanks for the answers guys !

I would like to use model mapping with binding form on request.

Well I see now a other way, probably better, to do what I want.

Thanks !

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