ElementLetter::rules PHP Method

    public function rules()
    {
        // NOTE: you should only define rules for those attributes that
        // will receive user inputs.
        return array(array('event_id, site_id, print, address, use_nickname, date, introduction, cc, re, body, footer, draft, direct_line, fax, clinic_date, print_all', 'safe'), array('use_nickname, site_id, date, address, introduction, body, footer', 'required'), array('date', 'OEDateValidator'), array('clinic_date', 'OEDateValidatorNotFuture'), array('id, event_id, site_id, use_nickname, date, introduction, re, body, footer, draft, direct_line', 'safe', 'on' => 'search'));
    }