[英]Traversing multiple JSON arrays in Play/Scala
{
"location":{
"residents":[{
"renting":[{
"name":"John Doe"
"pets":"2"
},{
"name":"Jane Smith"
"pets":"2"
}]
}]
}
}
I can successfully traverse location with this - 我可以成功遍历位置-
val json = ...
val rentReads = (__ \ 'location).read[String]
val rentResult = json.validate[String](rentReads)
rentResult match {
case s: JsSuccess[String] => Ok(s.get)
case e: JsError => Ok("Errors: " + JsError.toFlatJson(e).toString())
}
Based on the documentation, I should be able to do something like this - 根据文档,我应该能够执行以下操作-
val skillReads = ((__ \ 'location) \ 'residents)(0).read[String]
but it results in the following error - 但它导致以下错误-
Errors: {"obj.VariationResultsWrapper.VariationResultSets[0]":[{"msg":"error.path.missing","args":[]}]}
At this point I'm just trying to understand how to return values from "renting" only. 在这一点上,我只是试图了解如何仅从“租赁”中返回值。 Eventually, I would like to map that result to a case class.
最终,我想将结果映射到案例类。
If your eventual goal is to parse this into case classes, just define those case classes and let Play do the heavy lifting. 如果您最终的目标是将其解析为案例类,则只需定义这些案例类,然后让Play承担繁重的工作即可。
case class Renting(name: String, pets: String)
case class Resident(renting: List[Renting])
case class Location(residents: List[Resident])
implicit val rentingFormat = Json.format[Renting]
implicit val residentFormat = Json.format[Resident]
implicit val locationFormat = Json.format[Location]
(json \ "location").validate[Location]
res1: play.api.libs.json.JsResult[Location] = JsSuccess(Location(List(Resident(List(Renting(John Doe,2), Renting(Jane Smith,2))))),/residents)
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