无效的Json:使用播放正文解析器时，由于输入结束，没有内容要映射 [英] Invalid Json: No content to map due to end-of-input when using play body parser
问题描述
我正在尝试测试一种控制器方法，该方法尝试解析请求中发送的JSON:
I'm trying to test a controller method that attempts to parse JSON sent in the request:
def addRoomToProfileForTime = Action.async(parse.json[AddRoomToProfileForTimeRequest]) { request =>
profileService.addRoomToProfileForTime(request.body.roomId, request.body.profileId, request.body.timeRange).value.map {
case Xor.Right(_) => Ok
case Xor.Left(err) => BadRequest(Json.toJson(err))
}
}
这是代表请求的案例类:
This is the case class that represents the request:
final case class AddRoomToProfileForTimeRequest(
roomId: Int,
profileId: Int,
timeRange: TimeRange
)
implicit val addRoomToProfileForTimeRequestFormat:Format[AddRoomToProfileForTimeRequest] = Json.format
此代码按我的要求正常工作:
This code works as expected with I make a request like so:
curl -H "Content-Type: application/json" -X POST -d '{"roomId":3,"profileId":1,"timeRange":{"id":1,"fromTime":"2000-01-01T01:01","toTime":"2000-01-01T02:01"}}' http://localhost:9000/api/profiles/addRoomToProfileForTime
但是我正在尝试为此方法编写测试(请注意，我正在使用macwire进行依赖项注入，因此不能使用WithApplication:
But I'm trying to write a test for this method (note that I am using macwire for dependency injection, hence cannot use WithApplication:
"add a room to profile for time" in new TestContext {
val roomId = 1
val profileId = 1
val from = "2000-01-01T01:01"
val to = "2000-01-01T02:01"
val requestJson = Json.obj(
"roomId" -> roomId,
"profileId" -> profileId,
"timeRange" -> Json.obj(
"id" -> 1,
"fromTime" -> from,
"toTime" -> to
)
)
implicit val system = ActorSystem()
implicit val materializer = ActorMaterializer()
val fakeReq = FakeRequest(Helpers.POST, "api/profiles/addRoomToProfileForTime")
.withHeaders(CONTENT_TYPE -> "application/json")
.withJsonBody(requestJson)
val result = profileController.addRoomToProfileForTime()(fakeReq).run
val content = contentAsString(result)
println(content)
status(result) must equalTo(OK)
}
但是，此测试因Play的错误请求而失败:
However, this test fails with a Bad Request from Play:
<body>
<h1>Bad Request</h1>
<p id="detail">
For request 'POST api/profiles/addRoomToProfileForTime' [Invalid Json: No content to map due to end-of-input at [Source: akka.util.ByteIterator$ByteArrayIterator$$anon$1@37d14073; line: 1, column: 0]]
</p>
</body>
如果我使用request.body.asJson解析JSON，则该方法的行为将与预期的一样.我只是使用上面的body解析器方法得到此错误.
If I parse the JSON with request.body.asJson the method behaves as expected. It's only using the body parser method above that I get this error.
推荐答案
简短的答案是:在控制器测试中的FakeRequest上，使用withBody方法而不是withJsonBody.
The short answer is: on your FakeRequest in your controller test use the withBody method instead of withJsonBody.
我也遇到了这个问题，在解决这个问题之前，我尴尬地花了几个小时.长答案是FakeRequest的withJsonBody返回一个FakeRequest[AnyContentAsJson]，并且由于您的控制器期望一个JsValue(不是一个AnyContentAsJson)，因此在调用apply()时在您执行操作时，它与该apply方法不匹配，这是您想要的方法:
I had this issue as well, and I embarrassingly spent hours on it until I figured it out. The long answer is that FakeRequest's withJsonBody returns a FakeRequest[AnyContentAsJson], and since your controller is expecting a JsValue (not an AnyContentAsJson), when you call apply() on your action it fails to match this apply method, which is the one you want:
def apply(request: Request[A]): Future[Result]
和相反命中此套用方法:
def apply(rh: RequestHeader): Accumulator[ByteString, Result]
，因此由于您没有再将任何字节传递给累加器，所以您会收到意外的end-of-input错误消息.
and thus since you're not then passing any Bytes to the Accumulator, you get the unexpected end-of-input error message you're getting.
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