function update_position()
{
$errors = array();
// update the current permission position
if (!DataObject::updatePositions('DatasetField', $this->_data['field_id'], 'position', $this->_data['new_position'], $this->_data['current_position'], $errors)) {
echo json_encode(array('success' => FALSE, 'errors' => '<li>Error updating desired position</li>'));
exit;
}
echo json_encode(array('success' => TRUE));
exit;
}
