scala request.body.asJson 访问数组

Question

在我的 play Framework 应用程序中，我向后端发送了一个 json，在后端，我想访问 json

中的数组

我试过这个：

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

for (processStep <- steps) {

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

stepsData 是我要访问的数组

要求：

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})

Answer 1

您应该在 json 验证中执行此操作，即在您的 asOpt 方法中：

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

如果您在正文中使用其他字段，您甚至可以为预期的正文定义一个案例 class，并直接验证它：

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])

Answer 2

你能告诉我你的数据是什么样子的吗？

我处理这个问题的方法是，有一个案例 class for stepsData :

case class StepData(attributes ..)

然后有一个包装器：

case class StepDataWrapper(stepsData : List[StepData])

然后在您的控制器中指定隐式格式：

import play.api.libs.json._

implicit val stepDataFormat = Json.format[StepData]

implicit val stepDataListWrapperFormat =Json.format[StepDataWrapper]

然后，

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

scala request.body.asJson 访问数组

scala request.body.asJson access Array

arrays

json

scala

playframework

playframework-2.0