ORM::is_dirty PHP Method

    public function is_dirty($key)
    {
        return array_key_exists($key, $this->_dirty_fields);
    }

 /**
  * Check whether the given field has changed since the object was created or saved
  *
  * @param  string $property
  * @return bool
  */
 public function is_dirty($property)
 {
     return $this->orm->is_dirty($property);
 }