[英]spray json in scala: deserializing json with unknown fields without losing them
I'm looking for a solution to this but for json spray and my searches and attempts to get this working with json spray have failed thus far.我正在寻找解决方案, 但对于 json 喷雾,我的搜索和尝试使用 json 喷雾到目前为止都失败了。
If I have the following json:如果我有以下 json:
{
"personalData": {
"person": {
"first": "first_name",
"last": "last_name"
},
"contact": {
"phone": "1111111",
"address": {
"line": "123 Main St",
"city": "New York"
}
},
"xx": "yy", // unknown in advanced
"zz": { // unknown in advanced
"aa": "aa",
"bb": "bb",
"cc": {
"dd": "dd",
"ee": "ee"
}
}
}
}
We know for sure that the json will contain person and contact but we don't know what other fields may be created upstream from us that we don't care about/use.我们确定 json 将包含人员和联系人,但我们不知道我们不关心/使用的上游可能会创建哪些其他字段。
I want to serialize this JSON into a case class containing person and contact but on the other hand, I don't want to lose the other fields (save them in a map so the class will be deserialized to the same json as received). I want to serialize this JSON into a case class containing person and contact but on the other hand, I don't want to lose the other fields (save them in a map so the class will be deserialized to the same json as received).
This is how far I've made it:这是我做到了多远:
case class Address(
line: String,
city: String,
postalCode: Option[String]
)
case class Contact(
phone: String,
address: Address
)
case class Person(
first: String,
last: String
)
case class PersonalData(
person: Person,
contact: Contact,
extra: Map[String, JsValue]
)
implicit val personFormat = jsonFormat2(Person)
implicit val addressFormat = jsonFormat3(Address)
implicit val contactFormat = jsonFormat2(Contact)
implicit val personalDataFormat = new RootJsonFormat[PersonalData] {
def write(personalData: PersonalData): JsValue = {
JsObject(
"person" -> personalData.person.toJson,
"contact" -> personalData.contact.toJson,
// NOT SURE HOW TO REPRESENT extra input
)
}
def read(value: JsValue): CAERequestBEP = ???
}
Can someone help me do this with spray.json instead of play?有人可以用 spray.json 代替玩吗? I've spent such a long time trying to do this and can't seem to make it work.
我花了很长时间试图做到这一点,但似乎无法让它发挥作用。
In order to do that, you need to write your own formatter for PersonalDataFormat
:为此,您需要为
PersonalDataFormat
编写自己的格式化程序:
case class Person(first: String, last: String)
case class Address(line: String, city: String)
case class Contact(phone: String, address: Address)
case class PersonalData(person: Person, contact: Contact, extra: Map[String, JsValue])
case class Entity(personalData: PersonalData)
implicit val personFormat = jsonFormat2(Person)
implicit val addressFormat = jsonFormat2(Address)
implicit val contactFormat = jsonFormat2(Contact)
implicit object PersonalDataFormat extends RootJsonFormat[PersonalData] {
override def read(json: JsValue): PersonalData = {
val fields = json.asJsObject.fields
val person = fields.get("person").map(_.convertTo[Person]).getOrElse(???) // Do error handling instead of ???
val contact = fields.get("contact").map(_.convertTo[Contact]).getOrElse(???) // Do error handling instead of ???
PersonalData(person, contact, fields - "person" - "contact")
}
override def write(personalData: PersonalData): JsValue = {
JsObject(personalData.extra ++ ("person" -> personalData.person.toJson, "contact" -> personalData.contact.toJson))
}
}
implicit val entityFormat = jsonFormat1(Entity)
val jsonResult = jsonString.parseJson.convertTo[Entity]
The result is:结果是:
Entity(PersonalData(Person(first_name,last_name),Contact(1111111,Address(123 Main St,New York)),Map(xx -> "yy", zz -> {"aa":"aa","bb":"bb","cc":{}})))
(Assuming the json is not exactly the json above, but a valid similar one) (假设 json 不完全是上面的 json,而是一个有效的类似的)
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