Slick Grails Error Reporting

Here's a slick way of nicely reporting errors using Grails' built-in validation machinery:

package adminprototype
class AdminController {
  def index = { }
  def createDatabaseConnection = {
    render Utils.saveAndReport(
      new DatabaseConnection(params))
  }
}

package adminprototype
class Utils {
  static String saveAndReport(Object o){
    return o.save()?"success":reportErrors(o)
  }
  static String reportErrors(Object o){
    def error = o.errors.getFieldError()
    String field = error.getField().toString()
    field = field.replaceAll("\\B([A-Z])", " \$1")
    field = field.toLowerCase()
    String bogus = error.getRejectedValue()
    return "The "+field+" cannot be "+(bogus?bogus:"blank")+"."
  }
}

Now if I leave out the field "databaseName" in a request like this:
http://localhost:8080/AdminPrototype/admin/createDatabaseConnection?port=1234
I get a really nice error message with the camel case field name converted into a space delimited name:
The database name cannot be blank.