function idGetter() {
  if (this.$__._id) {
    return this.$__._id;
  }

  this.$__._id = this._id == null
      ? null
      : String(this._id);
  return this.$__._id;
}
/*!
 * Returns this documents _id cast to a string.
 */
Returns this documents _id cast to a string.
Returns this documents _id cast to a string .
function idGetter() {
  if (this.$__._id) {
    return this.$__._id;
  }
  this.$__._id = this._id == null
      ? null
      : String(this._id);
  return this.$__._id;
}
function idGetter ( ) { if ( this . $__ . _id ) { return this . $__ . _id ; } this . $__ . _id = this . _id == null ? null : String ( this . _id ) ; return this . $__ . _id ; }
Returns this documents _id cast to a string.
Returns this documents _id cast to a string .