How to get array from a json formatted form in Scala? - scala

Question

I am new to SCALA where I am going to develop an API with PLAY and SLICK.
I am going fetch an array (json formatted all the values are in integer) from a form via a web request like as follows:-
Request data:
{"ids": [1,2,3,4,5,6,7,8,9]}
Now I would like to fetch the form array data. Therefore I have declare a Form in my controller as:-
case class IdsForm(ids: Array[Int])
private val idsForm: Form[IdsForm] = Form(
mapping(
"ids" -> ????
)(IdsForm.apply)(IdsForm.unapply)
)
Now Would like to print all the elements in that array. Hence declare a function as follows:-
def getIds() = Action.async(parse.json) {
implicit request => idsForm.bind(request.body).fold(
formWithErrors => Future.successful(BadRequest(formWithErrors.toString)),
form => {
val ids = form.ids
// Print all the array elements
for ( x <- ids ) {
println( x )
}
val responseBody = Json.obj(
"status" -> 200,
"message" -> Json.toJson("Successfully printed")
)
Ok(responseBody)
}
)
}
Please let me know, what to put instead of "ids" -> ???? on my code. In case of single number I have putted "id" -> number. I don't know what to put instead of ???? in "ids" -> ????

Answer 1

You shouldn't use a form to submit JSON... Here you have example how to do it. Although, you could upload a JSON file if you want?
For example(I didn't test this), your data class:
case class MyData(ids: List[Int])
object MyData { implicit val myDataJsonFormat: Json.format[MyData] }
Your controller route:
def uploadJson = Action(parse.json) { request =>
val dataResult = request.body.validate[MyData]
dataResult.fold(
errors => { BadRequest(........) },
data => {
// do whatever with data....
Ok(....)
}
)
}

Answer 2

I use my code as:-
case class IdsForm(ids: Seq[Int])
private val idsForm: Form[IdsForm] = Form(
mapping(
"ids" -> seq[number]
)(IdsForm.apply)(IdsForm.unapply)
)
And the function is:-
def getIds() = Action.async(parse.json) {
implicit request => idsForm.bind(request.body).fold(
formWithErrors => Future.successful(BadRequest(formWithErrors.toString)),
form => {
val ids = form.ids
// Print all the array elements
for ( x <- 0 to ids.length - 1 ) {
println( ids(x) )
}
val responseBody = Json.obj(
"status" -> 200,
"message" -> Json.toJson("Successfully printed")
)
Ok(responseBody)
}
)
}
It works fine. Is it ok?