Fat grails domain class with custom marshaller

Media.groovy

package atoms.fat.media

import grails.converters.JSON
import org.joda.time.DateTime

class Media implements Serializable {

  String url
  String name
  DateTime dateCreated
  DateTime lastUpdated

  static constraints = {
    url blank: false, url: true, maxSize: 500
    name nullable: true, mazSize: 100
    dateCreated display: false, nullable: true
    lastUpdated display: false, nullable: true
  }


  //here custom marshaller
  static marshaller = {
    JSON.registerObjectMarshaller(Media, 1) { m ->
      return [
        id: m.id,
        url: m.url,
        name: m.name
      ]
    }
  }
}