A MappedNullableLong field is not displayed correctly. Instead of showing just the number (if Full) or a blank (if Empty), it shows the toString of the Box (i.e., "Empty" or "Full(x)" where x is the contained value). Also, creating a trait with a toForm method and adding it to a MappedNullableLong field doesn't work. See https://groups.google.com/d/topic/liftweb/K0v_JkZjYMI/discussion.

Example code:

trait NiceNullableLong[T <: Mapper[T]] {
  self: MappedNullableLong[T] =>
  
  override def toString = is.openOr("").toString
  override def toForm = Full(SHtml.text(toString, 
                                        x => if (x.length == 0) set(Empty) else set(Full(Integer.parseInt(x)))))
}

object maxMinutes extends MappedNullableLong(this) with NiceNullableLong[User]