public function add_comment()
 {
     $obj_option = joosRequest::post('obj_option');
     $obj_id = joosRequest::int('obj_id', 0);
     $comment_text = joosRequest::post('comment_text');
     $parent_id = joosRequest::int('parent_id', 0);
     $comment = new modelComments();
     $comment->obj_option = $obj_option;
     $comment->obj_id = $obj_id;
     $comment->comment_text = $comment_text;
     $comment->parent_id = $parent_id;
     $comment->store();
     return array();
 }