scala request.body.asJson access Array

Question

in my play Framework app I send an json to backend, in backend I want to access on array in the json

I tried this:

val processSteps = request.body.asJson.map{
  json => (json \ "stepsData").asOpt[Object].map { steps =>
    println(steps)
}

for (processStep <- steps) {

  processStep.map(_.validate[ProcessStepTemplatesModel] match {

stepsData is an array I want to access

Request:

Some({"steps":"","stepsData":[{"steptitle":"sd","title":"asd"}],"stepType":"duty","createdat":"2017-05-31 14:30:26","updatedat":"2017-05-31 14:30:26","activeSnackbar":false,"snackbarText":{"type":"span","key":null,"ref":null,"props":{"children":[{"key":null,"re
f":null,"props":{"value":"snackbar.processes.createProcess"},"_owner":null,"_store":{}},": ",null]},"_owner":null,"_store":{}},"approvedProcessTemplates":[],"approveprocess":17,"approveprocessTitle":"Felix","trainingsprocess":47,"trainprocessTitle":"Posaune","d
eleted":false,"dialogActive":false,"title":"ads","processtemplate":1,"loaded":true,"version":"asd","responsible":"asd","accountable":"asd","consulted":"asd","informed":"asd","deadline":"2017-05-18T12:30:09.460Z","dialogActions":[{"label":{"key":null,"ref":null,
"props":{"value":"dialog.processes.deleteProcess.cancel"},"_owner":null,"_store":{}}}],"dialogTitle":{"key":null,"ref":null,"props":{"value":"dialog.processes.selectProcessTemplate.trainingsprocess.header"},"_owner":null,"_store":{}},"dialogHandlerVariable":1})

Sam Upra · Accepted Answer · 2017-05-31 12:28:11Z

3

Can you show me how your data looks like?

The way I would approach this is, have a case class for stepsData :

case class StepData(attributes ..)

And then have a wrapper :

case class StepDataWrapper(stepsData : List[StepData])

Then specify an implicit format in your controller :

import play.api.libs.json._

implicit val stepDataFormat = Json.format[StepData]

implicit val stepDataListWrapperFormat =Json.format[StepDataWrapper]

And then,

  val processSteps = request.body.asJson.asOpt[StepDataWrapper]
                     .map{ 
                     stepDataWrapper => stepDataWrapper.stepsData.map(println(_))
                     }

answered May 31, 2017 at 12:28

Sam Upra

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3 Comments

Felix Over a year ago

added the request above

Sam Upra Over a year ago

defined this case class : StepData(steptitle : String, title : String) and follow the rest as above, it should work.

Sam Upra Over a year ago

Maybe following this can help you out : stackoverflow.com/questions/34437520/…

Cyrille Corpet · Accepted Answer · 2017-05-31 12:50:58Z

1

You should do this in json validation, that is in your asOpt method:

(json \ "stepsData").asOpt[Array[ProcessStepTemplatesModel]]

If you're using other fields in the body, you could even define a case class for expected body, and validate it directly:

case class StepProcessingRequestData(
  stepsData: Array[ProcessStempTemplatesModel],
  ... // add your other fields, as defined in your JSON schema
)

object StepProcessingRequestData {
  implicit val reads = Json.reads[StepProcessingRequestData]
}

val processStepsOpt: Option[StepProcessingRequestData] = 
  request.body.asJson.flatMap(_.asOpt[StepProcessingRequestData])

edited May 31, 2017 at 12:50

answered May 31, 2017 at 12:22

Cyrille Corpet

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2 Comments

Felix Over a year ago

first one returns nothing, second lots of errors ;)

Cyrille Corpet Over a year ago

What kind of errors? Do you have an implicit Reads[StepProcessingRequestData] in scope? does it validate the elements in your array?

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