[英]Play ScalaJSON Reads[T] parsing ValidationError(error.path.missing,WrappedArray())
我有一个有趣的json数据看起来像:
[ {
"internal_network" : [ {
"address" : [ {
"address_id" : 2,
"address" : "172.16.20.1/24"
}, {
"address_id" : 1,
"address" : "172.16.30.30/24"
} ]
} ],
"switch_id" : "0000000000000001"
}, {
"internal_network" : [ {
"address" : [ {
"address_id" : 2,
"address" : "172.16.30.1/24"
}, {
"address_id" : 1,
"address" : "192.168.10.1/24"
}, {
"address_id" : 3,
"address" : "172.16.10.1/24"
} ]
} ],
"switch_id" : "0000000000000002"
} ]
我写了案例类和自定义读取:
case class TheAddress(addr: (Int, String))
implicit val theAddressReads: Reads[TheAddress] = (
(__ \ "address_id").read[Int] and
(__ \ "address").read[String] tupled) map (TheAddress.apply _)
case class Addresses(addr: List[TheAddress])
implicit val addressesReads: Reads[Addresses] =
(__ \ "address").read(list[TheAddress](theAddressReads)) map (Addresses.apply _)
case class TheSwitch(
switch_id: String,
address: List[Addresses] = Nil)
implicit val theSwitchReads: Reads[TheSwitch] = (
(__ \ "switch_id").read[String] and
(__ \ "internal_network").read(list[Addresses](addressesReads)))(TheSwitch)
case class Switches(col: List[TheSwitch])
implicit val switchesReads: Reads[Switches] =
(__ \ "").read(list[TheSwitch](theSwitchReads)) map (Switches.apply _)
当我验证提供的数据时:
val json: JsValue = Json.parse(jsonChunk)
println(json.validate[TheSwitch])
我得到:
JsError(List((/switch_id,List(ValidationError(error.path.missing,WrappedArray()))), (/internal_network,List(ValidationError(error.path.missing,WrappedArray())))))
我可以像JsPath那样访问它
val switches: Seq[String] = (json \\ "switch_id").map(_.as[String])
但我真的在我的智慧结束与我自定义读取错误。 我试过放另一个顶级键和其他组合,但似乎我错过了一些至关重要的东西,因为我刚刚开始这个。
非常感谢。
该错误告诉您,而不是/switch_id
它有一个数组。 因此,您似乎应该将JSON读作List[Switch]
而不仅仅是Switch
假设你的Reads
(没有测试它们)是正确的,这应该工作:
val json: JsValue = Json.parse(jsonChunk)
println(json.validate[List[TheSwitch]])
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