agemooij

  implicit object ProductItemFormat extends RootJsonFormat[ProductItem] {
    // some fields are optional so we produce a list of options and
    // then flatten it to only write the fields that were Some(..)
    def write(item: ProductItem) = JsObject(
      List(
        Some("product_number" -> item.productNumber.toJson),
        item.ean.map(ean ⇒ "ean" -> ean.toJson),
        Some("title" -> item.title.toJson),
        item.description.map(description ⇒ "description" -> description.toJson),
        Some("price" -> item.price.toJson),