Adding all fields from a Map value to Json in Scala

Question

I have a list of documents, with data in the form of Map[String, Any] so that it can be added to a json object with fields and values respectively. So my code looks something like this when parsing:

val JsonDoc = Json.obj(
      "ORFID" -> doc("ORFID").toString,
      "ORF_len" -> doc("ORF_len").toString,
      "start" -> doc("start").toString,
      "end" -> doc("end").toString
...// more fields
)

However some documents may be missing one of the fields, so I need a more dynamic approach depending on each documents fields, or else an exception is thrown. What would be the best approach for this?

Having Any as value type of the Map is not a very good idea — cchantep
– cchantep, Commented Jun 6, 2016 at 20:13

evan.oman · Accepted Answer · 2016-06-06 18:32:45Z

2

You could try JsObject instead. Its constructor needs a Seq of tuples which you can get from your map with the method toSeq, this assuming, you want to use the same keys in your json as in the Map.

val jsonDoc = new JsonObj(doc.toSeq)

edited Jun 6, 2016 at 18:32

evan.oman

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answered Jun 6, 2016 at 18:29

Edwin

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1 Comment

Jorge Lazo Over a year ago

unfortunately, its a map of (String, Any) and the required typing is (String, JsValue), I resorted to use getOrElse on the fields that could potentially by empty to avoid the error

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