Converting JSON into Seq<String> in Scala - scala

Question

I'm new in Scala and trying to achieve the following using Scala's foldLeft() method or any other functional solution:
I have the following JSON:
{
"aspects": [
{
"name": "Name",
"values": [
"Phone"
]
},
{
"name": "Color",
"values": [
"Red",
"Black"
]
},
{
"name": "Size",
"values": [
"6",
"10"
]
}
]
}
I want to convert this into the following Seq<String>:
["Name:::Phone", "Color:::Red", "Color:::Black", "Size:::6", "Size:::10"]
I did that using Java style where aspects is an object representing the JSON:
aspects.foreach(pair => {
pair.values.foreach(value => {
valuesList += pair.name + ":::" + value
})
})
What is the best Scala's way to do this?

Answer 1

It depends on the JSON library you are using, but once you have the aspects data in a suitable format the output can be generated is like this:
case class Aspect(name: String, values: Seq[String])
val aspects: Seq[Aspect] = ???
aspects.flatMap(a => a.values.map(a.name + ":::" + _))
I use json4s and jackson and the conversion code is basically just
val aspects = parse(json).extract[Seq[Aspect]]
Check the documentation for details, and check out other JSON libraries which may be more suitable for your application.

Answer 2

Have not parsed the JSON since the object aspects has these values. Just manually constructing the case class and flatmapping it
scala> final case class Aspects(pairs:Seq[Pair])
defined class Aspects
val namepair = Pair("Name",Seq("Phone"))
namepair: Pair = Pair(Name,List(Phone))
val colorpair = Pair("Color",Seq("Red","Black"))
colorpair: Pair = Pair(Color,List(Red, Black))
val sizepair = Pair("Size",Seq("6","10"))
sizepair: Pair = Pair(Size,List(6, 10))
val aspects = Aspects(Seq(namepair,colorpair,sizepair))
aspects: Aspects = Aspects(List(Pair(Name,List(Phone)), Pair(Color,List(Red, Black)), Pair(Size,List(6, 10))))
aspects.pairs.flatMap(pair=>pair.values.map(value=>s"${pair.name}:::$value"))
res1: Seq[String] = List(Name:::Phone, Color:::Red, Color:::Black, Size:::6, Size:::10)