How to get value from JsValue? - json

Question

For Example:
My Db stores following Json. Form Following json I need to extract the value of particular field.
"student": [
{
"name": "Xyz",
"college": "abc",
"student_id":{
"$oid": "59a9314f6d0000920962e247"
}},
{
"name": "DDD",
"college": "opop",
"student_id":{
"$oid": "59a9314f6d0000920962e257"
}}
]
How can I pick only the value of "$oid" and save json in following way:
"student": [
{
"name": "Xyz",
"college": "abc",
"student_id":
"59a9314f6d0000920962e247"
},
{
"name": "DDD",
"college": "opop",
"student_id":
"59a9314f6d0000920962e257"
}
]

Answer 1

In my scenario, I'm reading it from client side as -
String Json = null;
JsonNode body = request().body().asJson();
Json = body.toString();
Logger.info(Json);
String role = body.get("role").get("role").asText();
users.firstName = body.get("firstName").asText();
users.lastName = body.get("lastName").asText();
You need to change the definition of JsonNode body = request().body().asJson(); and the other code as per your scenario to get it from db.

Answer 2

You will need to replace "student_id" jsValue with string value as below:
val original: JsValue = Json.parse(
""" {"student": [
{
"name": "Xyz",
"college": "abc",
"student_id":{
"$oid": "59a9314f6d0000920962e247"
}},
{
"name": "DDD",
"college": "opop",
"student_id":{
"$oid": "59a9314f6d0000920962e257"
}}
]}""")
val changed = original.as[JsObject] ++ Json.obj(
"student" -> Json.arr {
original.transform((__ \ 'student)
.json.pick[JsArray])
.getOrElse(Json.arr())
.value.map(e => {
val value = e.transform((__ \ 'student_id \ '$oid).json.pick[JsString]).get
e.as[JsObject] ++ Json.obj("student_id" -> value)
})
})
println(Json.stringify(changed))
//Result:
{"student":[[{"name":"Xyz","college":"abc","student_id":"59a9314f6d0000920962e247"},{"name":"DDD","college":"opop","student_id":"59a9314f6d0000920962e257"}]]}