[2.1-RC-2 Scala] parse simple json string from array of objects

[oblivion]

How do I parse a Json-String existing as an Array of Objects WITHOUT creating Readers and Writers?

[

{"key": "value1"},

{"key": "value2"}

]

I would like to end up with a List of Maps or anything similar:

Seq(Map("key" -> "value1"), Map("key" -> "value2"))

Json.parse(json) just returns a JsValue which cannot be iterated upon, so an array-walk is not possible?

With lift-json you could just write:

val prizes = for {

    JObject(str) <- json.parse(json)

    JField("key", JString(key)) <- str

  } yield MyObj(key)

[oblivion]

The Play 2.0 docs only mention what method to use to parse a String:

val json: JsValue = Json.parse(jsonString)

But there is no way of finding out how to parse an Array of Objects.

Also I am on 2.1 so there is no docs yet on how to accomplish this?

[Pascal Voitot Dev]

I'm not sure to understand your problem but this should do what you expect:

scala> val m = Json.parse(jsonString).as[Seq[Map[String, String]]]
m: Seq[Map[String,String]] = List(Map(key -> value1), Map(key -> value2))

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[oblivion]

Thanks, I was missing the "as" method.

I'm wondering how I could get it to work if I mix integers with
strings in the json-string:

as[Seq[Map[String, Any]] does not work.

On Jan 17, 12:29 pm, Pascal Voitot Dev <pascal.voitot....@gmail.com>
wrote:

[Pascal Voitot Dev]

On Thu, Jan 17, 2013 at 1:08 PM, oblivion <recalc...@web.de> wrote:

Thanks, I was missing the "as" method.

I'm wondering how I could get it to work if I mix integers with
strings in the json-string:

as[Seq[Map[String, Any]] does not work.

yes it doesn't work because there is no way to know how to read Any in a static-typed api.

for this, it's to go through a JsObject which is a really good heterogenous map.

obj =  ...as[Seq[JsObject]]

obj.fields => Seq[(String, JsValue)]

Pascal

 

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