Question

I’m trying to html-escape all strings in my objects when serializing them with Lift’s json library. I thought I could do this by passing an escape (partial) function to the objects’ FieldSerializer, but this seems to add fields to the json-object – not replace them. You can see what I mean by running the following simple example and note that it outputs
{"y":"test","x":"test"} while I wanted {"y":"test"}:

import net.liftweb.json.Serialization
import net.liftweb.json.FieldSerializer
import net.liftweb.json.FieldSerializer._
import net.liftweb.json.DefaultFormats
case class Simple(x: String)
implicit val formats = DefaultFormats + 
    FieldSerializer[Simple](renameTo("x","y"),renameFrom("y", "x"))
Serialization.write(Simple("test"))

Is there a way I can tell FieldSerializer to replace the field matched by my partial function?

Answer 1

Try CoustomeSerializer:

  implicit val formats = DefaultFormats +
    new CustomSerializer[Simple](ser => ( {
      case JObject(JField("y", JString(x)) :: Nil) => Simple(x)
    }, {
      case simple: Simple => JObject(JField("y", JString(simple.x)) :: Nil)
    }))

ps.I asked this on lift’s google group,and got this answer,checkout https://groups.google.com/d/msg/liftweb/ShRrGNrsu6Y/sNw4JGdSU6sJ