CODEWITHSUNDEEP
jsonscalaplayframework
Marco Prins
Marco Prins

Reputation: 7419

ScalaJson has no integer type?

I am trying to write a JSON API using Scala & Play Framework. My application needs to respond to a request in JSON format, converting a list of products to JSON

I'm implementing a writes method on my Product class which converts the fields to JSON. Every value needs to be converted to js using a method like JsString

Here 'tis

  def writes(product: Product) = {
    JsObject(Seq(
      "id" -> JsNumber(product.id),
      "title" -> JsString(product.title),
      "description" -> JsString(product.description),
      "available_online" -> JsBoolean(product.available_online)
    ))
  }

This code is failing in the third line because of a type mismatch

[error]  found   : Integer
[error]  required: BigDecimal

But when I consult the documentation, there seems to be no type for an integer.

So how should I deal with a field like id in JSON ?

Upvotes: 2

Views: 214

Answers (1)

Robby Cornelissen
Robby Cornelissen

Reputation: 97331

JSON does not distinguish between integer and floating point types, that's why you only see the JsNumber(value: BigDecimal) method in the documentation. You would have to convert your Integer to BigDecimal first using the BigDecimal object:

def writes(product: Product) = {
  JsObject(Seq(
    "id" -> JsNumber(BigDecimal(product.id)),
    "title" -> JsString(product.title),
    "description" -> JsString(product.description),
    "available_online" -> JsBoolean(product.available_online)
  ))
}

Upvotes: 5

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