/**
  * Returns a peer instance associated with this om.
  *
  * Since Peer classes are not to have any instance attributes, this method returns the
  * same instance for all member of this class. The method could therefore
  * be static, but this would prevent one from overriding the behavior.
  *
  * @return     CourseMetadataPeer
  */
 public function getPeer()
 {
     if (self::$peer === null) {
         self::$peer = new CourseMetadataPeer();
     }
     return self::$peer;
 }