Helper for Error class for form fields

cakephp::error class helper

/**
 * applyClass method
 *
 * @param string $feildname form feild name
 *
 * @return boolean true if isFieldError satisfies else false
*/

public function applyClass($feildname) 
{
    return ($this->isFieldError($feildname)) ? 'error' : '';
}//end applyClass()