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check num of fields in JSON match num of fields in case class #271

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check num of fields in JSON match num of fields in case class #271

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4 changes: 4 additions & 0 deletions src/main/boilerplate/spray/json/ProductFormatsInstances.scala.template
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,10 @@ trait ProductFormatsInstances { self: ProductFormats with StandardFormats =>
JsObject(fields: _*)
}
def read(value: JsValue) = {
val fields = getJsValueFields(value)
if (fields.size != 1) {
deserializationError("Number of fields in JSON does not equal to target class")
}
[#val p1V = fromField[P1](value, fieldName1)#
]
construct([#p1V#])
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12 changes: 11 additions & 1 deletion src/main/scala/spray/json/ProductFormats.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,11 @@ trait ProductFormats extends ProductFormatsInstances {
new RootJsonFormat[T] {
def write(p: T) = JsObject()
def read(value: JsValue) = value match {
case JsObject(_) => construct()
case JsObject(fields) =>
if (fields.size > 0) {
throw new DeserializationException(s"Redundant fields: ${fields.keys.mkString(",")}")
}
construct()
case _ => throw new DeserializationException("Object expected")
}
}
Expand Down Expand Up @@ -65,6 +69,12 @@ trait ProductFormats extends ProductFormatsInstances {
case _ => deserializationError("Object expected in field '" + fieldName + "'", fieldNames = fieldName :: Nil)
}

protected def getJsValueFields(value: JsValue) = value match {
case JsObject(fields) => fields
case _ => deserializationError("object expected!")

}

protected def extractFieldNames(tag: ClassTag[_]): Array[String] = {
val clazz = tag.runtimeClass
try {
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