Lift: CRUD interface for "foreign keys" using a multiselect and select2

BsonMetadata.scala

// ...
object author extends ObjectIdRefListField(this, MongoTerm)
  with One2ManyCRUD[BsonMetadata, MongoTerm] {
  override def options = MongoTerm.findAll(("category" -> "person")).map(x => (x.id.is, x.title))
}
// ...

edit.html

<div class="lift:surround?with=default;at=content">
  <div class="page-header">
    <h1 class="lift:Loc.i">Content</h1>
  </div>
  <div class="lift:EditPage">
    <form method="post">
      <select multiple="multiple">
        <option>...</option>
      </select>
      <input type="submit" value="Save" />
    </form>
  </div>
  <script type="text/javascript">
  $("select").select2({
    width : "element"
  });
  </script>
</div>

One2ManyCRUD.scala

/**
 * This trait provides display and edit interfaces for one2many fields and
 *  is to be mixed in to a ObjectIdRefListField. Edit will be done using a
 *  multiselect widget.
 */
trait One2ManyCRUD[A <: BsonRecord[A], B <: MongoRecord[B]]
  extends ObjectIdRefListField[A, B] {
  override def toForm = {
    Full(SHtml.multiSelectObj(options, is, set))
  }
}