CakePHP jQuery Ui Autocomplete Component (get data from DB)

ju_autocomplete.php

<?php
/**
 * JqueryUiAutocomplete Component
 * サーバー側にデータが要求されたときにDBからデータを取得
 * 
 * @author junichi11
 * 
 */
class JuAutocompleteComponent extends Object
{
	public $controller = null;
	protected $_query = array(
		'position' => 'center',
		'limit' => 10,
		'order' => 'ASC',
	);
	
	function __construct(){
		parent::__construct();
	}

	function startup(&$controller){
		$this->controller =&$controller;
		if(!empty($this->controller->autocomplete)){
			$this->_query = array_merge($this->_query, $this->controller->autocomplete);
		}
	}

	/**
	 * Get data
	 * @param array $get GET送信で取得したデータ field, term
	 * @param array $whitelist アクセス可能なテーブルのフィールド
	 * @param string $model モデル名
	 * @return array $data
	 */
	function getData($model, $whitelist = array()){
		$model = ucfirst($model);
		$this->model = $this->controller->$model;
		$field = $this->controller->params['url']['field'];
		$term = $this->controller->params['url']['term'];
		if(!in_array($field, $whitelist)){
			return false;
		}
		$condition = array();
		$position = "%".$term."%";
		if($this->_query['position'] == 'center'){
			$position = "%".$term."%";
		}else if($this->_query['position'] == 'left'){
			$position = $term."%";
		}else if($this->_query['position'] == 'right'){
			$position = "%".$term;
		}
		if(!empty($term)){
			$condition = array($this->model->alias.'.'.$field.' like' => $position);
		}
		$query = array(
			'fields' => array($field),
			'conditions' => $condition,
			'limit' => $this->_query['limit'],
			'order' => array($this->model->alias.'.'.$field => $this->_query['order']),
			'group' => $field,
		);
		$data = array();
		$items = $this->model->find('all', $query);
		
		foreach ($items as $item) {
			if(!empty($item[$this->model->alias][$field])){
				$cnt = array_push($data, $item[$this->model->alias][$field]);
			}
		}
		
		return $data;
	}
}
?>