get playlist and schedule

detail.php

<?php

class Model_Schedule_Detail extends Sprig {

    protected function _init() {
        $this->_fields += array(
            'id' => new Sprig_Field_Auto,
            'schedule' => new Sprig_Field_BelongsTo(array(
                'model' => 'schedule',
                'column' => 'schedule_id',
                
            )),
            'playlist' => new Sprig_Field_BelongsTo(array(
                'model' => 'playlist',
                'column' => 'playlist_id',
                
            )),
        );
    }
}

?>

playlist.php

<?php
//..
if (count($playlists) > 0) {
            $json = array('page' => $param['page'], 'total' => $total, 'rows' => array());
            foreach ($playlists as $key => $playlist) {
				$json['total']++;
				
				$schedule_name = array();
				foreach (Sprig::factory('schedule_detail', array('playlist' => $playlist->id))->load(NULL, false) as $k=>$v) {
					$schedule_name[] = $v->schedule->load()->name;
				}
                $json['rows'][] = array('id' => $playlist->id, 'cell' => array($key+1, $playlist->name, $playlist->template_id->load()->name, $schedule_name, $playlist->user_id->load()->username));				
                
            }
		
            return $json;
        }
//..