How does one convert JSON object with list into something iterable?

[markosski]

I know I can access each indexing e.g. .get(0) but how do I iterate over it?

val list = jawn.ast.JParser.parseFromString("""{"stuff": [1,2,3]}""").get
val stuff = list.get("stuff")
for (item <- stuff) println(item)

[non]

Hi @martez81 -- sorry I missed this!

I am planning on adding support for this in a new version, but currently you can just do something like this:

val stuff = list.get("stuff")
for { item <- stuff.vs } println(item)

The vs member is an Array[JValue] and should allow you to use Scala collection methods.

[markosski]

Ahh this is all I really need thanks!

[markosski]

Sorry, just tried this and list.get("stuff") returns JValue and there is no vs member :(

Here's exactly how I use it

val parsed = jawn.ast.JParser.parseFromPath(s"${Config.home}/$name/_table.json").get
val parsedCols = parsed.get("columns")  // want to iterate over this

and json contents

{
    "name": "correla_dataset_small",
    "columns": [{
            "name": "age",
            "type": "TinyIntType",
            "encoder": "Dense"
        }, {
            "name": "fname",
            "type": "VarCharType",
            "size": 15,
            "encoder": "Dict"
        }, {
            "name": "lname",
            "type": "VarCharType",
            "size": 30,
            "encoder": "Dict"
        }]
}

using version 0.8.3

[tapmania]

@non is adding a getIterable and asIterable to JValue and implementing it in JArray the right approach? What about adding getMap and asMap to JValue and implementing it in JObject

[tapmania]

I have a PR out, please have a look: https://github.com/non/jawn/pull/68

[jan-xyz]

I had a similar problem.

I got hold of the problem by finding out that the object I got was already a JArray. However, I used it like a JValue. JValue doesn't have a vs as @martez81 mentioned above. JArray on the other hand does have an attribute vs.

I managed to use the JSON array by converting it to such:

import jawn.ast.JParser
import jawn.ast.JArray

val list = JParser.parseFromString("""{"stuff": [1,2,3]}""").get
val stuff = list.get("stuff").asInstanceof[JArray]
for (item <- stuff) println(item)