Parsing JsArray into case class without doing it verbosely by referencing the Json keys

Question

I have a Json object stored in Mongo like below. It is 'flat', i.e. no nested elements:

{
   "key1" : "val1",
   "key2" : "val2",
    ....
   "keyn" : "valn"

}

I have fetched it as a JsArray. I also have a case class:

case class IndividualProduct(key1: String, key2: String, ... , key_n: String) {}

In total the Json will have over 40 key/value pairs. Is there a neat way to parse the JsArray into the case class without verbosely referencing the keys?

thanks in advance - Future[Thanks]

Wait, as JsArray? Since that's not an array, it should fail. Just fetch it as JsObject instead. — Marius Soutier
– Marius Soutier, Commented Feb 25, 2014 at 13:17
my apologies for not being clearer. The Json is as represented above, but I have managed to get it as a JsArray from using the ReactiveMongo plugin. — sectornitad
– sectornitad, Commented Feb 25, 2014 at 13:21
Then change to JsObject, what's the problem? Maybe you should post that part too, because currently it doesn't make sense. — Marius Soutier
– Marius Soutier, Commented Feb 25, 2014 at 13:37
Ok, so if I have a JsObject then what do I do to read the values out of it? — sectornitad
– sectornitad, Commented Feb 25, 2014 at 14:25

Marius Soutier · Accepted Answer · 2014-02-25 13:18:18Z

1

import play.api.libs.json._
implicit val reader = Json.reads[IndividualProduct]
val ip = Json.fromJson[IndividualProduct](fetchedJsObj)

edited Feb 25, 2014 at 13:18

answered Feb 25, 2014 at 12:52

Marius Soutier

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2 Comments

sectornitad Over a year ago

thanks, is the fetchedJsObj the JsArray I have? And does this reader then create the case class with all the fields?

Marius Soutier Over a year ago

That's the JsObject that you should have. Json.reads is a macro that creates a reader from your case class. For more info refer to the official docs, they explain all that stuff.

serejja · Accepted Answer · 2014-02-25 12:52:46Z

0

That's not a JsArray, but rather a Map[String, String]. So if you have a json like the one you showed, here's what can work:

val json = getYourJsonFromDB()
val kv = json.as[Map[String, String]]

Now you'll be able to do something like this:

val valueForKey13 = kv.get("key13") //returns an Option[String]

Hope this helps

answered Feb 25, 2014 at 12:52

serejja

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