I'm having an Array[Array[Byte]] and I would like to serialize it to Json in Playframework:
implicit val matrixWrites = new Writes[matrix] {
def writes(c: Matrix): JsValue = {
Json.obj(
"id" -> c.id,
"matr" -> c.matr
)
}
}
However I get the error Type mismatch: found (String, Array[Array[Byte]] required (String, Json.JsValueWrapper)
What is the correct way to turn a Array[Array[Byte]] into Json?
Create a Writes[Array[Array[Byte]]] that serializes the array of byte array into some string format ( maybe base64 ).
You may also want to create a Reads for the same type to convert back to Array[Array[Byte]].
On a related note, I like to wrap my binary data, so the implicit Format has not to be imported explicitly.
import org.apache.commons.codec.binary.Base64
import play.api.libs.json.{Format, Reads, Writes}
case class BinaryData(bytes: Array[Byte])
object BinaryData {
implicit val MessageFormat: Format[BinaryData] = Format(Reads.of[String].map(s => apply(Base64.decodeBase64(s))), Writes(a => Writes.of[String].writes(Base64.encodeBase64String(a.bytes))))
}
