/**
* Whether a offset exists
* @link http://php.net/manual/en/arrayaccess.offsetexists.php
* @param mixed $offset an offset to check for.
* @return boolean true on success or false on failure.
* The return value will be casted to boolean if non-boolean was returned.
*/
public function offsetExists($offset)
{
return isset($this->data[$offset]) || $this->model->fieldExists($offset) || $this->getStorage($offset);
}
