array('sorter, sub_type, parent_id', 'numerical', 'integerOnly'=>true),
array('sorter, parent_id', 'numerical', 'integerOnly'=>true),
array('id, sorter, date_updated, sub_type', 'safe', 'on'=>'search'),
array('id, sorter, date_updated', 'safe', 'on'=>'search'),
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